GDB copyright headers update after running GDB's copyright.py script.

[thirdparty/binutils-gdb.git] / gdb / configure.ac

dnl Autoconf configure script for GDB, the GNU debugger.
dnl Copyright (C) 1995-2016 Free Software Foundation, Inc.
dnl
dnl This file is part of GDB.
dnl
dnl This program is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU General Public License as published by
dnl the Free Software Foundation; either version 3 of the License, or
dnl (at your option) any later version.
dnl
dnl This program is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
dnl GNU General Public License for more details.
dnl
dnl You should have received a copy of the GNU General Public License
dnl along with this program.  If not, see <http://www.gnu.org/licenses/>.

dnl Process this file with autoconf to produce a configure script.

AC_PREREQ(2.59)dnl
AC_INIT(main.c)
AC_CONFIG_HEADER(config.h:config.in)
AM_MAINTAINER_MODE

# Set the 'development' global.
. $srcdir/../bfd/development.sh

AC_PROG_CC
AC_PROG_CXX

AC_USE_SYSTEM_EXTENSIONS
ACX_LARGEFILE
AM_PROG_CC_STDC
AM_PROG_INSTALL_STRIP

AC_CONFIG_AUX_DIR(..)
AC_CANONICAL_SYSTEM
AC_ARG_PROGRAM

# See if we are building with C++, and substitute COMPILER.
GDB_AC_BUILD_WITH_CXX

# Dependency checking.
ZW_CREATE_DEPDIR
ZW_PROG_COMPILER_DEPENDENCIES([CC])

# Check for the 'make' the user wants to use.
AC_CHECK_PROGS(MAKE, make)
MAKE_IS_GNU=
case "`$MAKE --version 2>&1 | sed 1q`" in
  *GNU*)
    MAKE_IS_GNU=yes
    ;;
esac
AM_CONDITIONAL(GMAKE, test "$MAKE_IS_GNU" = yes)
AC_PROG_MAKE_SET

gnulib_extra_configure_args=
# If large-file support is disabled, make sure gnulib does the same.
if test "$enable_largefile" = no; then
gnulib_extra_configure_args="$gnulib_extra_configure_args --disable-largefile"
fi

# Configure gnulib.  We need to build gnulib under some other
# directory not "gnulib", to avoid the problem of both GDB and
# GDBserver wanting to build it in the same directory, when building
# in the source dir.
ACX_CONFIGURE_DIR(["gnulib"], ["build-gnulib"],
                  ["$gnulib_extra_configure_args"])

dnl List of object files and targets accumulated by configure.

CONFIG_OBS=
CONFIG_DEPS=
CONFIG_SRCS=
ENABLE_CFLAGS=

CONFIG_ALL=
CONFIG_CLEAN=
CONFIG_INSTALL=
CONFIG_UNINSTALL=

dnl Set up for gettext.
ZW_GNU_GETTEXT_SISTER_DIR

localedir='${datadir}/locale'
AC_SUBST(localedir)

if test x"$USE_NLS" = xyes; then
   CONFIG_ALL="$CONFIG_ALL all-po"
   CONFIG_CLEAN="$CONFIG_CLEAN clean-po"
   CONFIG_INSTALL="$CONFIG_INSTALL install-po"
   CONFIG_UNINSTALL="$CONFIG_UNINSTALL uninstall-po"
fi

GNULIB=build-gnulib/import

# For Makefile dependencies.
GNULIB_STDINT_H=
if test x"$STDINT_H" != x; then
  GNULIB_STDINT_H=$GNULIB/$STDINT_H
fi
AC_SUBST(GNULIB_STDINT_H)

PACKAGE=gdb
AC_DEFINE_UNQUOTED(PACKAGE, "$PACKAGE", [Name of this package. ])
AC_SUBST(PACKAGE)

# We never need to detect it in this sub-configure.
# But preserve it for config.status --recheck.
AC_ARG_VAR(MAKEINFO,
  [Parent configure detects if it is of sufficient version.])
AC_ARG_VAR(MAKEINFOFLAGS,
  [Parameters for MAKEINFO.])

MAKEINFO_EXTRA_FLAGS=""
AC_CACHE_CHECK([whether $MAKEINFO supports @click], gdb_cv_have_makeinfo_click,
  [echo '@clicksequence{a @click{} b}' >conftest.texinfo
  if eval "$MAKEINFO conftest.texinfo >&5 2>&5"; then
    gdb_cv_have_makeinfo_click=yes
  else
    gdb_cv_have_makeinfo_click=no
  fi])
if test x"$gdb_cv_have_makeinfo_click" = xyes; then
  MAKEINFO_EXTRA_FLAGS="$MAKEINFO_EXTRA_FLAGS -DHAVE_MAKEINFO_CLICK"
fi
AC_SUBST(MAKEINFO_EXTRA_FLAGS)

GDB_AC_WITH_DIR(DEBUGDIR, separate-debug-dir,
    [look for global separate debug info in this path @<:@LIBDIR/debug@:>@],
    [${libdir}/debug])

# We can't pass paths as command line arguments.
# Mingw32 tries to be clever and will convert the paths for us.
# For example -DBINDIR="/usr/local/bin" passed on the command line may get
# converted to -DBINDIR="E:/msys/mingw32/msys/1.0/local/bin".
# This breaks GDB's relocatable path conversions since paths passed in
# config.h would not get so translated, the path prefixes no longer match.
AC_DEFINE_DIR(BINDIR, bindir, [Directory of programs.])

# GDB's datadir relocation

GDB_AC_WITH_DIR(GDB_DATADIR, gdb-datadir,
    [look for global separate data files in this path @<:@DATADIR/gdb@:>@],
    [${datadir}/gdb])

AC_ARG_WITH(relocated-sources,
AS_HELP_STRING([--with-relocated-sources=PATH], [automatically relocate this path for source files]),
[reloc_srcdir="${withval}"
 AC_DEFINE_DIR(RELOC_SRCDIR, reloc_srcdir,
              [Relocated directory for source files. ])
])

AC_MSG_CHECKING([for default auto-load directory])
AC_ARG_WITH(auto-load-dir,
AS_HELP_STRING([--with-auto-load-dir=PATH],
  [directories from which to load auto-loaded scripts @<:@$debugdir:$datadir/auto-load@:>@]),,
  [with_auto_load_dir='$debugdir:$datadir/auto-load'])
escape_dir=`echo $with_auto_load_dir | sed 's/[[$]]\(datadir\|debugdir\)\>/\\\\\\\\\\\\&/g'`
AC_DEFINE_DIR(AUTO_LOAD_DIR, escape_dir,
	      [Directories from which to load auto-loaded scripts.])
AC_MSG_RESULT([$with_auto_load_dir])

AC_MSG_CHECKING([for default auto-load safe-path])
AC_ARG_WITH(auto-load-safe-path,
AS_HELP_STRING([--with-auto-load-safe-path=PATH],
  [directories safe to hold auto-loaded files @<:@--with-auto-load-dir@:>@])
AS_HELP_STRING([--without-auto-load-safe-path],
               [do not restrict auto-loaded files locations]),
    [if test "$with_auto_load_safe_path" = "no"; then
     with_auto_load_safe_path="/"
     fi],
[with_auto_load_safe_path="$with_auto_load_dir"])
escape_dir=`echo $with_auto_load_safe_path | sed 's/[[$]]\(datadir\|debugdir\)\>/\\\\\\\\\\\\&/g'`
AC_DEFINE_DIR(AUTO_LOAD_SAFE_PATH, escape_dir,
	      [Directories safe to hold auto-loaded files.])
AC_MSG_RESULT([$with_auto_load_safe_path])

AC_CONFIG_SUBDIRS(testsuite)

# Check whether to support alternative target configurations
AC_ARG_ENABLE(targets,
AS_HELP_STRING([--enable-targets=TARGETS], [alternative target configurations]),
[case "${enableval}" in
  yes | "") AC_ERROR(enable-targets option must specify target names or 'all')
            ;;
  no)       enable_targets= ;;
  *)        enable_targets=$enableval ;;
esac])

# Check whether to enable 64-bit support on 32-bit hosts
AC_ARG_ENABLE(64-bit-bfd,
AS_HELP_STRING([--enable-64-bit-bfd], [64-bit support (on hosts with narrower word sizes)]),
[case "${enableval}" in
  yes)  want64=true  ;;
  no)   want64=false ;;
  *)    AC_MSG_ERROR(bad value ${enableval} for 64-bit-bfd option) ;;
esac],[want64=false])dnl

# Provide defaults for some variables set by the per-host and per-target
# configuration.
gdb_host_obs=posix-hdep.o

if test "${target}" = "${host}"; then
  gdb_native=yes
else
  gdb_native=no
fi

. $srcdir/configure.host

# Add in the common host objects.
. $srcdir/common/common.host
gdb_host_obs="$gdb_host_obs $common_host_obs"

# Accumulate some settings from configure.tgt over all enabled targets

TARGET_OBS=
all_targets=
HAVE_NATIVE_GCORE_TARGET=

for targ_alias in `echo $target_alias $enable_targets | sed 's/,/ /g'`
do
  if test "$targ_alias" = "all"; then
    all_targets=true
  else
    # Canonicalize the secondary target names.
    result=`$ac_config_sub $targ_alias 2>/dev/null`
    if test -n "$result"; then
        targ=$result
    else
        targ=$targ_alias
    fi

    . ${srcdir}/configure.tgt

    AS_IF([test -z "${gdb_target_obs}"],
      [AC_MSG_ERROR([configuration ${targ} is unsupported.])])

    # Target-specific object files
    for i in ${gdb_target_obs}; do
        case " $TARGET_OBS " in
        *" ${i} "*) ;;
        *)
          TARGET_OBS="$TARGET_OBS ${i}"
          ;;
        esac
    done

    # Check whether this target needs 64-bit CORE_ADDR
    if test x${want64} = xfalse; then
      . ${srcdir}/../bfd/config.bfd
    fi

    # Check whether this target is native and supports gcore.
    if test $gdb_native = yes -a "$targ_alias" = "$target_alias" \
       && $gdb_have_gcore; then
      HAVE_NATIVE_GCORE_TARGET=1
    fi
  fi
done

if test x${all_targets} = xtrue; then

  # We want all 64-bit targets if we either:
  #  - run on a 64-bit host  or
  #  - already require 64-bit support for some other target  or
  #  - the --enable-64-bit-bfd option was supplied
  # Otherwise we only support all 32-bit targets.
  #
  # NOTE: This test must be in sync with the corresponding
  #       tests in BFD!

  if test x${want64} = xfalse; then
    AC_CHECK_SIZEOF(long)
    if test "x${ac_cv_sizeof_long}" = "x8"; then
      want64=true
    fi
  fi
  if test x${want64} = xtrue; then
    TARGET_OBS='$(ALL_TARGET_OBS) $(ALL_64_TARGET_OBS)'
  else
    TARGET_OBS='$(ALL_TARGET_OBS)'
  fi
fi

AC_SUBST(TARGET_OBS)
AC_SUBST(HAVE_NATIVE_GCORE_TARGET)

# For other settings, only the main target counts.
gdb_sim=
gdb_osabi=
build_gdbserver=
targ=$target; . ${srcdir}/configure.tgt

# Fetch the default architecture and default target vector from BFD.
targ=$target; . $srcdir/../bfd/config.bfd

# We only want the first architecture, so strip off the others if
# there is more than one.
targ_archs=`echo $targ_archs | sed 's/ .*//'`

if test "x$targ_archs" != x; then
  AC_DEFINE_UNQUOTED(DEFAULT_BFD_ARCH, $targ_archs,
    [Define to BFD's default architecture. ])
fi
if test "x$targ_defvec" != x; then
  AC_DEFINE_UNQUOTED(DEFAULT_BFD_VEC, $targ_defvec,
    [Define to BFD's default target vector. ])
fi

# The CLI cannot be disabled yet, but may be in the future.

# Enable CLI.
AC_ARG_ENABLE(gdbcli,
AS_HELP_STRING([--disable-gdbcli], [disable command-line interface (CLI)]),
  [case $enableval in
    yes)
      ;;
    no)
      AC_MSG_ERROR([the command-line interface cannot be disabled yet]) ;;
    *)
      AC_MSG_ERROR([bad value $enableval for --enable-gdbcli]) ;;
  esac],
  [enable_gdbcli=yes])
if test x"$enable_gdbcli" = xyes; then
  if test -d $srcdir/cli; then
    CONFIG_OBS="$CONFIG_OBS \$(SUBDIR_CLI_OBS)"
    CONFIG_DEPS="$CONFIG_DEPS \$(SUBDIR_CLI_DEPS)"
    CONFIG_SRCS="$CONFIG_SRCS \$(SUBDIR_CLI_SRCS)"
    ENABLE_CFLAGS="$ENABLE_CFLAGS \$(SUBDIR_CLI_CFLAGS)"
  fi
fi

# Enable MI.
AC_ARG_ENABLE(gdbmi,
AS_HELP_STRING([--disable-gdbmi], [disable machine-interface (MI)]),
  [case $enableval in
    yes | no)
      ;;
    *)
      AC_MSG_ERROR([bad value $enableval for --enable-gdbmi]) ;;
  esac],
  [enable_gdbmi=yes])
if test x"$enable_gdbmi" = xyes; then
  if test -d $srcdir/mi; then
    CONFIG_OBS="$CONFIG_OBS \$(SUBDIR_MI_OBS)"
    CONFIG_DEPS="$CONFIG_DEPS \$(SUBDIR_MI_DEPS)"
    CONFIG_SRCS="$CONFIG_SRCS \$(SUBDIR_MI_SRCS)"
    ENABLE_CFLAGS="$ENABLE_CFLAGS \$(SUBDIR_MI_CFLAGS)"
  fi
fi

# Enable TUI.
AC_ARG_ENABLE(tui,
AS_HELP_STRING([--enable-tui], [enable full-screen terminal user interface (TUI)]),
  [case $enableval in
    yes | no | auto)
      ;;
    *)
      AC_MSG_ERROR([bad value $enableval for --enable-tui]) ;;
  esac],enable_tui=auto)

# Enable gdbtk.
AC_ARG_ENABLE(gdbtk,
AS_HELP_STRING([--enable-gdbtk], [enable gdbtk graphical user interface (GUI)]),
  [case $enableval in
    yes | no)
      ;;
    *)
      AC_MSG_ERROR([bad value $enableval for --enable-gdbtk]) ;;
  esac],
  [if test -d $srcdir/gdbtk; then
    enable_gdbtk=yes
  else
    enable_gdbtk=no
  fi])
# We unconditionally disable gdbtk tests on selected platforms.
case $host_os in
  go32* | windows*)
    AC_MSG_WARN([gdbtk isn't supported on $host; disabling])
    enable_gdbtk=no ;;
esac

# Libunwind support for ia64.

AC_ARG_WITH(libunwind-ia64,
AS_HELP_STRING([--with-libunwind-ia64],
	       [use libunwind frame unwinding for ia64 targets]),,
	    [with_libunwind_ia64=auto])

# Backward compatibility option.
if test "${with_libunwind+set}" = set; then
  if test x"$with_libunwind_ia64" != xauto; then
    AC_MSG_ERROR(
      [option --with-libunwind is deprecated, use --with-libunwind-ia64])
  fi
  AC_MSG_WARN([option --with-libunwind is deprecated, use --with-libunwind-ia64])
  with_libunwind_ia64="$with_libunwind"
fi

case "$with_libunwind_ia64" in
  yes | no)
    ;;
  auto)
    AC_CHECK_HEADERS(libunwind-ia64.h)
    with_libunwind_ia64=$ac_cv_header_libunwind_ia64_h
    ;;
  *)
    AC_MSG_ERROR(
      [bad value $with_libunwind_ia64 for GDB --with-libunwind-ia64 option])
    ;;
esac

if test x"$with_libunwind_ia64" = xyes; then
  AC_CHECK_HEADERS(libunwind-ia64.h)
  if test x"$ac_cv_header_libunwind_ia64_h" != xyes; then
    AC_MSG_ERROR([GDB option --with-libunwind-ia64 requires libunwind-ia64.h])
  fi
  CONFIG_OBS="$CONFIG_OBS ia64-libunwind-tdep.o"
  CONFIG_DEPS="$CONFIG_DEPS ia64-libunwind-tdep.o"
  CONFIG_SRCS="$CONFIG_SRCS ia64-libunwind-tdep.c"
fi

opt_curses=no
AC_ARG_WITH(curses, AS_HELP_STRING([--with-curses], [use the curses library instead of the termcap library]), opt_curses=$withval)

prefer_curses=no
if test "$opt_curses" = "yes"; then
  prefer_curses=yes
fi

# Profiling support.
AC_ARG_ENABLE(profiling,
AS_HELP_STRING([--enable-profiling], [enable profiling of GDB]),
  [case $enableval in
    yes | no)
      ;;
    *)
      AC_MSG_ERROR([bad value $enableval for --enable-profile]) ;;
  esac],
 [enable_profiling=no])

AC_CHECK_FUNCS(monstartup _mcleanup)
AC_CACHE_CHECK([for _etext], ac_cv_var__etext,
[AC_TRY_LINK(
[#include <stdlib.h>
extern char _etext;
],
[free (&_etext);], ac_cv_var__etext=yes, ac_cv_var__etext=no)])
if test $ac_cv_var__etext = yes; then
  AC_DEFINE(HAVE__ETEXT, 1,
            [Define to 1 if your system has the _etext variable. ])
fi
AC_CACHE_CHECK([for etext], ac_cv_var_etext,
[AC_TRY_LINK(
[#include <stdlib.h>
extern char etext;
],
[free (&etext);], ac_cv_var_etext=yes, ac_cv_var_etext=no)])
if test $ac_cv_var_etext = yes; then
  AC_DEFINE(HAVE_ETEXT, 1,
            [Define to 1 if your system has the etext variable. ])
fi
if test "$enable_profiling" = yes ; then
  if test $ac_cv_func_monstartup = no || test $ac_cv_func__mcleanup = no; then
    AC_MSG_ERROR(--enable-profiling requires monstartup and _mcleanup)
  fi
  PROFILE_CFLAGS=-pg
  OLD_CFLAGS="$CFLAGS"
  CFLAGS="$CFLAGS $PROFILE_CFLAGS"

  AC_CACHE_CHECK([whether $CC supports -pg], ac_cv_cc_supports_pg,
    [AC_TRY_COMPILE([], [int x;], ac_cv_cc_supports_pg=yes,
     ac_cv_cc_supports_pg=no)])

  if test $ac_cv_cc_supports_pg = no; then
    AC_MSG_ERROR(--enable-profiling requires a compiler which supports -pg)
  fi

  CFLAGS="$OLD_CFLAGS"
fi

ACX_PKGVERSION([GDB])
ACX_BUGURL([http://www.gnu.org/software/gdb/bugs/])
AC_DEFINE_UNQUOTED([PKGVERSION], ["$PKGVERSION"], [Additional package description])
AC_DEFINE_UNQUOTED([REPORT_BUGS_TO], ["$REPORT_BUGS_TO"], [Bug reporting address])

# --------------------- #
# Checks for programs.  #
# --------------------- #

AC_PROG_AWK
AC_PROG_INSTALL
AC_PROG_LN_S
AC_PROG_RANLIB
AC_PROG_YACC

AC_CHECK_TOOL(AR, ar)
AC_CHECK_TOOL(DLLTOOL, dlltool)
AC_CHECK_TOOL(WINDRES, windres)

case $host_os in
  gnu*)
    # Needed for GNU Hurd hosts.
    AC_CHECK_TOOL(MIG, mig)
    if test x"$MIG" = x; then
      AC_MSG_ERROR([MIG not found but required for $host hosts])
    fi
    ;;
esac

# ---------------------- #
# Checks for libraries.  #
# ---------------------- #

# We might need to link with -lm; most simulators need it.
AC_CHECK_LIB(m, main)

# We need to link with -lw to get `wctype' on Solaris before Solaris
# 2.6.  Solaris 2.6 and beyond have this function in libc, and have a
# libw that some versions of the GNU linker cannot hanle (GNU ld 2.9.1
# is known to have this problem).  Therefore we avoid libw if we can.
AC_CHECK_FUNC(wctype, [],
  [AC_CHECK_LIB(w, wctype)])

# Some systems (e.g. Solaris) have `gethostbyname' in libnsl.
AC_SEARCH_LIBS(gethostbyname, nsl)

# Some systems (e.g. Solaris) have `socketpair' in libsocket.
AC_SEARCH_LIBS(socketpair, socket)

# Link in zlib if we can.  This allows us to read compressed debug sections.
AM_ZLIB

# On FreeBSD we may need libutil for kinfo_getvmmap (used by fbsd-nat.c).
AC_SEARCH_LIBS(kinfo_getvmmap, util,
  [AC_DEFINE(HAVE_KINFO_GETVMMAP, 1,
            [Define to 1 if your system has the kinfo_getvmmap function. ])])

AM_ICONV

# GDB may fork/exec the iconv program to get the list of supported character
# sets.  Allow the user to specify where to find it.
# There are several factors affecting the choice of option name:
# - There is already --with-libiconv-prefix but we can't use it, it specifies
#   the build-time location of libiconv files.
# - The program we need to find is iconv, which comes with glibc.  The user
#   doesn't necessarily have libiconv installed.  Therefore naming this
#   --with-libiconv-foo feels wrong.
# - We want the path to be relocatable, but GDB_AC_DEFINE_RELOCATABLE is
#   defined to work on directories not files (though it really doesn't know
#   the difference).
# - Calling this --with-iconv-prefix is perceived to cause too much confusion
#   with --with-libiconv-prefix.
# Putting these together is why the option name is --with-iconv-bin.

AC_ARG_WITH(iconv-bin,
AS_HELP_STRING([--with-iconv-bin=PATH], [specify where to find the iconv program]),
[iconv_bin="${withval}"
 AC_DEFINE_UNQUOTED([ICONV_BIN], ["${iconv_bin}"],
                    [Path of directory of iconv program.])
 GDB_AC_DEFINE_RELOCATABLE(ICONV_BIN, iconv, ${iconv_bin})
])

# For the TUI, we need enhanced curses functionality.
if test x"$enable_tui" != xno; then
  prefer_curses=yes
fi

curses_found=no
if test x"$prefer_curses" = xyes; then
  # FIXME: kettenis/20040905: We prefer ncurses over the vendor-supplied
  # curses library because the latter might not provide all the
  # functionality we need.  However, this leads to problems on systems
  # where the linker searches /usr/local/lib, but the compiler doesn't
  # search /usr/local/include, if ncurses is installed in /usr/local.  A
  # default installation of ncurses on alpha*-dec-osf* will lead to such
  # a situation.
  AC_SEARCH_LIBS(waddstr, [ncurses cursesX curses])

  if test "$ac_cv_search_waddstr" != no; then
    curses_found=yes
  fi
fi

# Check whether we should enable the TUI, but only do so if we really
# can.
if test x"$enable_tui" != xno; then
  if test -d $srcdir/tui; then
    if test "$curses_found" != no; then
      CONFIG_OBS="$CONFIG_OBS \$(SUBDIR_TUI_OBS)"
      CONFIG_DEPS="$CONFIG_DEPS \$(SUBDIR_TUI_DEPS)"
      CONFIG_SRCS="$CONFIG_SRCS \$(SUBDIR_TUI_SRCS)"
      ENABLE_CFLAGS="$ENABLE_CFLAGS \$(SUBDIR_TUI_CFLAGS)"
    else
      if test x"$enable_tui" = xyes; then
	AC_MSG_ERROR([no enhanced curses library found; disable TUI])
      else
	AC_MSG_WARN([no enhanced curses library found; disabling TUI])
      fi
    fi
  fi
fi

# Since GDB uses Readline, we need termcap functionality.  In many
# cases this will be provided by the curses library, but some systems
# have a seperate termcap library, or no curses library at all.

case $host_os in
  cygwin*)
    if test -d $srcdir/libtermcap; then
      LIBS="../libtermcap/libtermcap.a $LIBS"
      ac_cv_search_tgetent="../libtermcap/libtermcap.a"
    fi ;;
  go32* | *djgpp*)
    ac_cv_search_tgetent="none required"
    ;;
esac

# These are the libraries checked by Readline.
AC_SEARCH_LIBS(tgetent, [termcap tinfo curses ncurses])

if test "$ac_cv_search_tgetent" = no; then
  CONFIG_OBS="$CONFIG_OBS stub-termcap.o"
fi

AC_ARG_WITH([system-readline],
  [AS_HELP_STRING([--with-system-readline],
                  [use installed readline library])])

if test "$with_system_readline" = yes; then
  READLINE=-lreadline
  READLINE_DEPS=
  READLINE_CFLAGS=
  READLINE_TEXI_INCFLAG=
else
  READLINE='$(READLINE_DIR)/libreadline.a'
  READLINE_DEPS='$(READLINE)'
  READLINE_CFLAGS='-I$(READLINE_SRC)/..'
  READLINE_TEXI_INCFLAG='-I $(READLINE_DIR)'
fi
AC_SUBST(READLINE)
AC_SUBST(READLINE_DEPS)
AC_SUBST(READLINE_CFLAGS)
AC_SUBST(READLINE_TEXI_INCFLAG)

# Generate jit-reader.h

# This is typedeffed to GDB_CORE_ADDR in jit-reader.h
TARGET_PTR=

AC_CHECK_SIZEOF(unsigned long long)
AC_CHECK_SIZEOF(unsigned long)
AC_CHECK_SIZEOF(unsigned __int128)

if test "x${ac_cv_sizeof_unsigned_long}" = "x8"; then
  TARGET_PTR="unsigned long"
elif test "x${ac_cv_sizeof_unsigned_long_long}" = "x8"; then
  TARGET_PTR="unsigned long long"
elif test "x${ac_cv_sizeof_unsigned___int128}" = "x16"; then
  TARGET_PTR="unsigned __int128"
else
  TARGET_PTR="unsigned long"
fi

AC_SUBST(TARGET_PTR)
AC_CONFIG_FILES([jit-reader.h:jit-reader.in])

AC_SEARCH_LIBS(dlopen, dl)

GDB_AC_WITH_DIR([JIT_READER_DIR], [jit-reader-dir],
                [directory to load the JIT readers from],
                [${libdir}/gdb])

AC_ARG_WITH(expat,
  AS_HELP_STRING([--with-expat], [include expat support (auto/yes/no)]),
  [], [with_expat=auto])
AC_MSG_CHECKING([whether to use expat])
AC_MSG_RESULT([$with_expat])

if test "${with_expat}" = no; then
  AC_MSG_WARN([expat support disabled; some features may be unavailable.])
  HAVE_LIBEXPAT=no
else
  AC_LIB_HAVE_LINKFLAGS([expat], [], [#include "expat.h"],
			[XML_Parser p = XML_ParserCreate (0);])
  if test "$HAVE_LIBEXPAT" != yes; then
    if test "$with_expat" = yes; then
      AC_MSG_ERROR([expat is missing or unusable])
    else
      AC_MSG_WARN([expat is missing or unusable; some features may be unavailable.])
    fi
  else
    save_LIBS=$LIBS
    LIBS="$LIBS $LIBEXPAT"
    AC_CHECK_FUNCS(XML_StopParser)
    LIBS=$save_LIBS
  fi
fi

# --------------------- #
# Check for libpython.  #
# --------------------- #

dnl Utility to simplify finding libpython.
dnl $1 = pythonX.Y
dnl $2 = the shell variable to assign the result to
dnl      If libpython is found we store $version here.
dnl $3 = additional flags to add to CPPFLAGS
dnl $4 = additional flags to add to LIBS

AC_DEFUN([AC_TRY_LIBPYTHON],
[
  version=$1
  define([have_libpython_var],$2)
  new_CPPFLAGS=$3
  new_LIBS=$4
  AC_MSG_CHECKING([for ${version}])
  save_CPPFLAGS=$CPPFLAGS
  save_LIBS=$LIBS
  CPPFLAGS="$CPPFLAGS $new_CPPFLAGS"
  LIBS="$LIBS $new_LIBS"
  found_usable_python=no
  AC_LINK_IFELSE(AC_LANG_PROGRAM([[#include "Python.h"]],
                                 [[Py_Initialize ();]]),
                 [have_libpython_var=${version}
                  found_usable_python=yes
                  PYTHON_CPPFLAGS=$new_CPPFLAGS
                  PYTHON_LIBS=$new_LIBS])
  CPPFLAGS=$save_CPPFLAGS
  LIBS=$save_LIBS
  AC_MSG_RESULT([${found_usable_python}])
])

dnl There are several different values for --with-python:
dnl
dnl no -   Don't include python support.
dnl yes -  Include python support, error if it's missing.
dnl        If we find python in $PATH, use it to fetch configure options,
dnl        otherwise assume the compiler can find it with no help from us.
dnl        Python 2.7, 2.6, 2.5, and then 2.4 are tried in turn.
dnl auto - Same as "yes", but if python is missing from the system,
dnl        fall back to "no".
dnl /path/to/python/exec-prefix -
dnl        Use the python located in this directory.
dnl        If /path/to/python/exec-prefix/bin/python exists, use it to find
dnl        the compilation parameters.  Otherwise use
dnl        -I/path/to/python/exec-prefix/include,
dnl        -L/path/to/python/exec-prefix/lib.
dnl        Python 2.7, 2.6, 2.5, and then 2.4 are tried in turn.
dnl        NOTE: This case is historical.  It is what was done for 7.0/7.1
dnl        but is deprecated.
dnl /path/to/python/executable -
dnl        Run python-config.py with this version of python to fetch the
dnl        compilation parameters.
dnl        NOTE: This needn't be the real python executable.
dnl        In a cross-compilation scenario (build != host), this could be
dnl        a shell script that provides what python-config.py provides for
dnl        --ldflags, --includes, --exec-prefix.
dnl python-executable -
dnl        Find python-executable in $PATH, and then handle the same as
dnl        /path/to/python/executable.
dnl
dnl If a python program is specified, it is used to run python-config.py and
dnl is passed --ldflags, --includes, --exec-prefix.

AC_ARG_WITH(python,
  AS_HELP_STRING([--with-python@<:@=PYTHON@:>@], [include python support (auto/yes/no/<python-program>)]),
  [], [with_python=auto])
AC_MSG_CHECKING([whether to use python])
AC_MSG_RESULT([$with_python])

if test "${with_python}" = no; then
  AC_MSG_WARN([python support disabled; some features may be unavailable.])
  have_libpython=no
else
  case "${with_python}" in
  [[\\/]]* | ?:[[\\/]]*)
    if test -d ${with_python}; then
      # Assume the python binary is ${with_python}/bin/python.
      python_prog="${with_python}/bin/python"
      python_prefix=
      # If python does not exit ${with_python}/bin, then try in
      # ${with_python}.  On Windows/MinGW, this is where the Python
      # executable is.
      if test ! -x "${python_prog}"; then
        python_prog="${with_python}/python"
        python_prefix=
      fi
      if test ! -x "${python_prog}"; then
        # Fall back to gdb 7.0/7.1 behaviour.
        python_prog=missing
        python_prefix=${with_python}
      fi
    elif test -x "${with_python}"; then
      # While we can't run python compiled for $host (unless host == build),
      # the user could write a script that provides the needed information,
      # so we support that.
      python_prog=${with_python}
      python_prefix=
    else
      AC_ERROR(invalid value for --with-python)
    fi
    ;;
  */*)
    # Disallow --with-python=foo/bar.
    AC_ERROR(invalid value for --with-python)
    ;;
  *)
    # The user has either specified auto, yes, or the name of the python
    # program assumed to be in $PATH.
    python_prefix=
    case "${with_python}" in
    yes | auto)
      if test ${build} = ${host}; then
        AC_PATH_PROG(python_prog_path, python, missing)
        if test "${python_prog_path}" = missing; then
          python_prog=missing
        else
          python_prog=${python_prog_path}
        fi
      else
        # Not much we can do except assume the cross-compiler will find the
        # right files.
        python_prog=missing
      fi
      ;;
    *)
      # While we can't run python compiled for $host (unless host == build),
      # the user could write a script that provides the needed information,
      # so we support that.
      python_prog="${with_python}"
      AC_PATH_PROG(python_prog_path, ${python_prog}, missing)
      if test "${python_prog_path}" = missing; then
        AC_ERROR(unable to find python program ${python_prog})
      fi
      ;;
    esac
  esac

  if test "${python_prog}" != missing; then
    # We have a python program to use, but it may be too old.
    # Don't flag an error for --with-python=auto (the default).
    have_python_config=yes
    python_includes=`${python_prog} ${srcdir}/python/python-config.py --includes`
    if test $? != 0; then
      have_python_config=failed
      if test "${with_python}" != auto; then
        AC_ERROR(failure running python-config --includes)
      fi
    fi
    python_libs=`${python_prog} ${srcdir}/python/python-config.py --ldflags`
    if test $? != 0; then
      have_python_config=failed
      if test "${with_python}" != auto; then
        AC_ERROR(failure running python-config --ldflags)
      fi
    fi
    python_prefix=`${python_prog} ${srcdir}/python/python-config.py --exec-prefix`
    if test $? != 0; then
      have_python_config=failed
      if test "${with_python}" != auto; then
        AC_ERROR(failure running python-config --exec-prefix)
      fi
    fi
  else
    # We do not have a python executable we can use to determine where
    # to find the Python headers and libs.  We cannot guess the include
    # path from the python_prefix either, because that include path
    # depends on the Python version.  So, there is nothing much we can
    # do except assume that the compiler will be able to find those files.
    python_includes=
    python_libs=
    have_python_config=no
  fi

  # If we have python-config, only try the configuration it provides.
  # Otherwise fallback on the old way of trying different versions of
  # python in turn.

  have_libpython=no
  if test "${have_python_config}" = yes; then
    # Determine the Python version by extracting "-lpython<version>"
    # part of the python_libs. <version> is usually X.Y with X and Y
    # being decimal numbers, but can also be XY (seen on Windows).
    #
    # The extraction is performed using sed with a regular expression.
    # Initially, the regexp used was using the '?' quantifier to make
    # the dot in the version number optional.  Unfortunately, this
    # does not work with non-GNU versions of sed because, because of
    # what looks like a limitation (the '?' quantifier does not work
    # with back-references).  We work around this limitation by using
    # the '*' quantifier instead.  It means that, in theory, we might
    # match unexpected version strings such as "-lpython2..7", but
    # this seems unlikely in practice.  And even if that happens,
    # an error will be triggered later on, when checking that version
    # number.
    python_version=`echo " ${python_libs} " \
                         | sed -e 's,^.* -l\(python[[0-9]]*[[.]]*[[0-9]]*\).*$,\1,'`
    case "${python_version}" in
    python*)
      AC_TRY_LIBPYTHON(${python_version}, have_libpython,
                       ${python_includes}, ${python_libs})
      ;;
    *)
      AC_MSG_ERROR([unable to determine python version from ${python_libs}])
      ;;
    esac
  elif test "${have_python_config}" != failed; then
    if test "${have_libpython}" = no; then
      AC_TRY_LIBPYTHON(python2.7, have_libpython,
                       ${python_includes}, "${python_libs} -lpython2.7")
    fi
    if test "${have_libpython}" = no; then
      AC_TRY_LIBPYTHON(python2.6, have_libpython,
                       ${python_includes}, "${python_libs} -lpython2.6")
    fi
    if test ${have_libpython} = no; then
      AC_TRY_LIBPYTHON(python2.5, have_libpython,
                       ${python_includes}, "${python_libs} -lpython2.5")
    fi
    if test ${have_libpython} = no; then
      AC_TRY_LIBPYTHON(python2.4, have_libpython,
                       ${python_includes}, "${python_libs} -lpython2.4")
    fi
  fi
  if test "${have_libpython}" = python2.7 -o "${have_libpython}" = python27; then
    AC_DEFINE(HAVE_LIBPYTHON2_7, 1, [Define if Python 2.7 is being used.])
  elif test "${have_libpython}" = python2.6 -o "${have_libpython}" = python26; then
    AC_DEFINE(HAVE_LIBPYTHON2_6, 1, [Define if Python 2.6 is being used.])
  elif test "${have_libpython}" = python2.5 -o "${have_libpython}" = python25; then
    AC_DEFINE(HAVE_LIBPYTHON2_5, 1, [Define if Python 2.5 is being used.])
  elif test "${have_libpython}" = python2.4 -o "${have_libpython}" = python24; then
    AC_DEFINE(HAVE_LIBPYTHON2_4, 1, [Define if Python 2.4 is being used.])
  fi

  if test "${have_libpython}" = no; then
    case "${with_python}" in
    yes)
      AC_MSG_ERROR([python is missing or unusable])
      ;;
    auto)
      AC_MSG_WARN([python is missing or unusable; some features may be unavailable.])
      ;;
    *)
      AC_MSG_ERROR([no usable python found at ${with_python}])
      ;;
    esac
  else
    if test -n "${python_prefix}"; then
      AC_DEFINE_UNQUOTED(WITH_PYTHON_PATH, "${python_prefix}",
                         [Define if --with-python provides a path, either directly or via python-config.py --exec-prefix.])
      GDB_AC_DEFINE_RELOCATABLE(PYTHON_PATH, python, ${python_prefix})
    fi
  fi
fi

if test "${have_libpython}" != no; then
  AC_DEFINE(HAVE_PYTHON, 1, [Define if Python interpreter is being linked in.])
  CONFIG_OBS="$CONFIG_OBS \$(SUBDIR_PYTHON_OBS)"
  CONFIG_DEPS="$CONFIG_DEPS \$(SUBDIR_PYTHON_DEPS)"
  CONFIG_SRCS="$CONFIG_SRCS \$(SUBDIR_PYTHON_SRCS)"
  CONFIG_INSTALL="$CONFIG_INSTALL install-python"
  ENABLE_CFLAGS="$ENABLE_CFLAGS \$(SUBDIR_PYTHON_CFLAGS)"

  # Flags needed to compile Python code (taken from python-config --cflags).
  # We cannot call python-config directly because it will output whatever was
  # used when compiling the Python interpreter itself, including flags which
  # would make the python-related objects be compiled differently from the
  # rest of GDB (e.g., -O2 and -fPIC).
  if test "${GCC}" = yes; then
    tentative_python_cflags="-fno-strict-aliasing -DNDEBUG -fwrapv"
  fi

  if test "x${tentative_python_cflags}" != x; then
    AC_MSG_CHECKING(compiler flags for python code)
    for flag in ${tentative_python_cflags}; do
      # Check that the compiler accepts it
      saved_CFLAGS="$CFLAGS"
      CFLAGS="$CFLAGS $flag"
      AC_TRY_COMPILE([],[],PYTHON_CFLAGS="${PYTHON_CFLAGS} $flag",)
      CFLAGS="$saved_CFLAGS"
    done
    AC_MSG_RESULT(${PYTHON_CFLAGS})
  fi

  # On x64 Windows, Python's include headers, and pyconfig.h in
  # particular, rely on MS_WIN64 macro to detect that it's a 64bit
  # version of Windows.  Unfortunately, MS_WIN64 is only defined if
  # _MSC_VER, a Microsoft-specific macro, is defined.  So, when
  # building on x64 Windows with GCC, we define MS_WIN64 ourselves.
  # The issue was reported to the Python community, but still isn't
  # solved as of 2012-10-02 (http://bugs.python.org/issue4709).

  case "$gdb_host" in
    mingw64)
           if test "${GCC}" = yes; then
             CPPFLAGS="$CPPFLAGS -DMS_WIN64"
           fi
           ;;
  esac

  # Note that "python -m threading" cannot be used to check for
  # threading support due to a bug in Python 2.7.3
  # (http://bugs.python.org/issue15567).
  AC_MSG_CHECKING(whether python supports threads)
  saved_CPPFLAGS="${CPPFLAGS}"
  CPPFLAGS="${PYTHON_CPPFLAGS}"
  # Note that the test is reversed so that python_has_threads=yes on
  # unexpected failures.
  AC_PREPROC_IFELSE(AC_LANG_SOURCE([[
#include <Python.h>
#ifdef WITH_THREAD
# error
#endif
  ]]), [python_has_threads=no], [python_has_threads=yes])
  AC_MSG_RESULT(${python_has_threads})
  CPPFLAGS="${saved_CPPFLAGS}"
else
  # Even if Python support is not compiled in, we need to have this file
  # included so that the "python" command, et.al., still exists.
  CONFIG_OBS="$CONFIG_OBS python.o"
  CONFIG_SRCS="$CONFIG_SRCS python/python.c"
fi
AC_SUBST(PYTHON_CFLAGS)
AC_SUBST(PYTHON_CPPFLAGS)
AC_SUBST(PYTHON_LIBS)
AM_CONDITIONAL(HAVE_PYTHON, test "${have_libpython}" != no)

# -------------------- #
# Check for libguile.  #
# -------------------- #

dnl Utility to simplify finding libguile.
dnl $1 = pkg-config-program
dnl $2 = space-separate list of guile versions to try
dnl $3 = yes|no, indicating whether to flag errors or ignore them
dnl $4 = the shell variable to assign the result to
dnl      If libguile is found we store "yes" here.

AC_DEFUN([AC_TRY_LIBGUILE],
[
  pkg_config=$1
  guile_version_list=$2
  flag_errors=$3
  define([have_libguile_var],$4)
  found_usable_guile=checking
  AC_MSG_CHECKING([for usable guile from ${pkg_config}])
  for guile_version in ${guile_version_list}; do
    ${pkg_config} --exists ${guile_version} 2>/dev/null
    if test $? != 0; then
      continue
    fi
    dnl pkg-config says the package exists, so if we get an error now,
    dnl that's bad.
    new_CPPFLAGS=`${pkg_config} --cflags ${guile_version}`
    if test $? != 0; then
      AC_MSG_ERROR([failure running pkg-config --cflags ${guile_version}])
    fi
    new_LIBS=`${pkg_config} --libs ${guile_version}`
    if test $? != 0; then
      AC_MSG_ERROR([failure running pkg-config --libs ${guile_version}])
    fi
    dnl If we get this far, great.
    found_usable_guile=${guile_version}
    break
  done
  if test "${found_usable_guile}" = "checking"; then
    if test "${flag_errors}" = "yes"; then
      AC_MSG_ERROR([unable to find usable guile version from "${guile_version_list}"])
    else
      found_usable_guile=no
    fi
  fi
  dnl One final sanity check.
  dnl The user could have said --with-guile=python-2.7.
  if test "${found_usable_guile}" != no; then
    save_CPPFLAGS=$CPPFLAGS
    save_LIBS=$LIBS
    CPPFLAGS="$CPPFLAGS $new_CPPFLAGS"
    LIBS="$LIBS $new_LIBS"
    AC_LINK_IFELSE(AC_LANG_PROGRAM([[#include "libguile.h"]],
                                   [[scm_init_guile ();]]),
                   [have_libguile_var=yes
                    GUILE_CPPFLAGS=$new_CPPFLAGS
                    GUILE_LIBS=$new_LIBS],
                   [found_usable_guile=no])
    dnl scm_set_automatic_finalization_enabled added in Guile 2.2.
    AC_CHECK_FUNC(scm_set_automatic_finalization_enabled,
      AC_DEFINE(HAVE_GUILE_MANUAL_FINALIZATION, 1,
                [Define if Guile supports manual finalization.])
    )
    CPPFLAGS=$save_CPPFLAGS
    LIBS=$save_LIBS
    if test "${found_usable_guile}" = no; then
      if test "${flag_errors}" = yes; then
        AC_MSG_FAILURE([linking guile version ${guile_version} test program failed])
      fi
    fi
  fi
  AC_MSG_RESULT([${found_usable_guile}])
])

dnl There are several different values for --with-guile:
dnl
dnl no -   Don't include guile support.
dnl yes -  Include guile support, error if it's missing.
dnl        The pkg-config program must be in $PATH.
dnl auto - Same as "yes", but if guile is missing from the system,
dnl        fall back to "no".
dnl guile-version [guile-version-choice-2 ...] -
dnl        A space-separated list of guile package versions to try.
dnl        These are passed to pkg-config as-is.
dnl        E.g., guile-2.0 or guile-2.2-uninstalled
dnl        This requires making sure PKG_CONFIG_PATH is set appropriately.
dnl /path/to/pkg-config -
dnl        Use this pkg-config program.
dnl        NOTE: This needn't be the "real" pkg-config program.
dnl        It could be a shell script.  It is invoked as:
dnl        pkg-config --exists $version
dnl        pkg-config --cflags $version
dnl        pkg-config --libs $version
dnl        pkg-config --variable guild $version
dnl        The script will be called with $version having each value in
dnl        $try_guile_versions until --exists indicates success.

AC_ARG_WITH(guile,
  AS_HELP_STRING([--with-guile@<:@=GUILE@:>@], [include guile support (auto/yes/no/<guile-version>/<pkg-config-program>)]),
  [], [with_guile=auto])
AC_MSG_CHECKING([whether to use guile])
AC_MSG_RESULT([$with_guile])

dnl We check guile with pkg-config.
AC_PATH_PROG(pkg_config_prog_path, pkg-config, missing)

try_guile_versions="guile-2.2 guile-2.0"
have_libguile=no
case "${with_guile}" in
no)
  AC_MSG_WARN([guile support disabled; some features will be unavailable.])
  ;;
auto)
  if test "${pkg_config_prog_path}" = "missing"; then
    AC_MSG_WARN([pkg-config not found, guile support disabled])
  else
    AC_TRY_LIBGUILE(${pkg_config_prog_path}, ${try_guile_versions}, no, have_libguile)
  fi
  ;;
yes)
  if test "${pkg_config_prog_path}" = "missing"; then
    AC_MSG_ERROR([pkg-config not found])
  fi
  AC_TRY_LIBGUILE(${pkg_config_prog_path}, ${try_guile_versions}, yes, have_libguile)
  ;;
[[\\/]]* | ?:[[\\/]]*)
  if test -x "${with_guile}"; then
    AC_TRY_LIBGUILE(${with_guile}, ${try_guile_versions}, yes, have_libguile)
  else
    AC_MSG_ERROR([Guile config program not executable: ${with_guile}])
  fi
  ;;
"" | */*)
  # Disallow --with=guile="" and --with-guile=foo/bar.
  AC_MSG_ERROR([invalid value for --with-guile])
  ;;
*)
  # A space separate list of guile versions to try, in order.
  if test "${pkg_config_prog_path}" = "missing"; then
    AC_MSG_ERROR([pkg-config not found])
  fi
  AC_TRY_LIBGUILE(${pkg_config_prog_path}, ${with_guile}, yes, have_libguile)
  ;;
esac

if test "${have_libguile}" != no; then
  dnl Get the name of the 'guild' program.
  case "${with_guile}" in
  [[\\/]]* | ?:[[\\/]]*)
    GDB_GUILE_PROGRAM_NAMES(["${with_guile}"], ["${guile_version}"])
    ;;
  *)
    GDB_GUILE_PROGRAM_NAMES(["${pkg_config_prog_path}"], ["${guile_version}"])
    ;;
  esac

  dnl Make sure guild can handle this host.
  GDB_TRY_GUILD([$srcdir/guile/lib/gdb/support.scm])
  dnl If not, disable guile support.
  if test "$ac_cv_guild_ok" = no; then
    have_libguile=no
    AC_MSG_WARN(disabling guile support, $GUILD fails compiling for $host)
  fi
fi

if test "${have_libguile}" != no; then
  AC_DEFINE(HAVE_GUILE, 1, [Define if Guile interpreter is being linked in.])
  CONFIG_OBS="$CONFIG_OBS \$(SUBDIR_GUILE_OBS)"
  CONFIG_DEPS="$CONFIG_DEPS \$(SUBDIR_GUILE_DEPS)"
  CONFIG_SRCS="$CONFIG_SRCS \$(SUBDIR_GUILE_SRCS)"
  CONFIG_INSTALL="$CONFIG_INSTALL install-guile"
  ENABLE_CFLAGS="$ENABLE_CFLAGS \$(SUBDIR_GUILE_CFLAGS)"

  dnl The 'scm_new_smob' function appeared in Guile 2.0.6.
  save_LIBS="$LIBS"
  save_CPPFLAGS="$CPPFLAGS"
  LIBS="$GUILE_LIBS"
  CPPFLAGS="$GUILE_CPPFLAGS"
  AC_CHECK_FUNCS([scm_new_smob])
  LIBS="$save_LIBS"
  CPPFLAGS="$save_CPPFLAGS"
else
  # Even if Guile support is not compiled in, we need to have these files
  # included.
  CONFIG_OBS="$CONFIG_OBS guile.o"
  CONFIG_SRCS="$CONFIG_SRCS guile/guile.c"
fi
AC_SUBST(GUILE_CPPFLAGS)
AC_SUBST(GUILE_LIBS)
AM_CONDITIONAL(HAVE_GUILE, test "${have_libguile}" != no)

# --------------------- #
# Check for libmcheck.  #
# --------------------- #

# Enable -lmcheck by default (it provides cheap-enough memory mangling),
# but turn it off if Python is enabled with threads, since -lmcheck is
# not thread safe (http://sourceware.org/bugzilla/show_bug.cgi?id=9939),
# and for releases.
if test \( "${have_libpython}" = "no" -o "${python_has_threads}" = "no" \) \
   && $development; then
  libmcheck_default=yes
else
  libmcheck_default=no
fi
GDB_AC_LIBMCHECK(${libmcheck_default})

if test "$ENABLE_LIBMCHECK" = "yes" \
	-a "${have_libpython}" != "no" \
	-a "${python_has_threads}" = "yes" ; then
  AC_MSG_WARN(--enable-libmcheck may lead to spurious crashes if threads are used in python)
fi

AC_ARG_WITH(intel_pt,
  AS_HELP_STRING([--with-intel-pt], [include Intel(R) Processor Trace support (auto/yes/no)]),
  [], [with_intel_pt=auto])
AC_MSG_CHECKING([whether to use intel pt])
AC_MSG_RESULT([$with_intel_pt])

if test "${with_intel_pt}" = no; then
  AC_MSG_WARN([Intel(R) Processor Trace support disabled; some features may be unavailable.])
  HAVE_LIBIPT=no
else
  AC_PREPROC_IFELSE(AC_LANG_SOURCE([[
#include <linux/perf_event.h>
#ifndef PERF_ATTR_SIZE_VER5
# error
#endif
  ]]), [perf_event=yes], [perf_event=no])
  if test "$perf_event" != yes; then
    if test "$with_intel_pt" = yes; then
      AC_MSG_ERROR([linux/perf_event.h missing or too old])
    else
      AC_MSG_WARN([linux/perf_event.h missing or too old; some features may be unavailable.])
    fi
  fi

  AC_LIB_HAVE_LINKFLAGS([ipt], [], [#include "intel-pt.h"], [pt_insn_alloc_decoder (0);])
  if test "$HAVE_LIBIPT" != yes; then
    if test "$with_intel_pt" = yes; then
      AC_MSG_ERROR([libipt is missing or unusable])
    else
      AC_MSG_WARN([libipt is missing or unusable; some features may be unavailable.])
    fi
  fi
fi

# ------------------------- #
# Checks for header files.  #
# ------------------------- #

AC_HEADER_STDC
# elf_hp.h is for HP/UX 64-bit shared library support.
AC_CHECK_HEADERS([nlist.h machine/reg.h poll.h sys/poll.h proc_service.h \
                  thread_db.h \
		  sys/fault.h \
		  sys/file.h sys/filio.h sys/ioctl.h sys/param.h \
		  sys/resource.h sys/procfs.h sys/ptrace.h ptrace.h \
		  sys/reg.h sys/debugreg.h sys/select.h sys/syscall.h \
		  termios.h termio.h \
		  sgtty.h elf_hp.h \
		  dlfcn.h])
AC_CHECK_HEADERS(sys/proc.h, [], [],
[#if HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
])
AC_CHECK_HEADERS(sys/user.h, [], [],
[#if HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
])

# On Solaris 2.[789], we need to define _MSE_INT_H to avoid a clash
# between <widec.h> and <wchar.h> that would cause AC_CHECK_HEADERS to
# think that we don't have <curses.h> if we're using GCC.
case $host_os in
  solaris2.[[789]])
    if test "$GCC" = yes; then
      AC_DEFINE(_MSE_INT_H, 1,
        [Define to 1 to avoid a clash between <widec.h> and <wchar.h> on
   Solaris 2.[789] when using GCC. ])
    fi ;;
esac
AC_CHECK_HEADERS(curses.h cursesX.h ncurses.h ncurses/ncurses.h ncurses/term.h)
AC_CHECK_HEADERS(term.h, [], [],
[#if HAVE_CURSES_H
# include <curses.h>
#endif
])

# ------------------------- #
# Checks for declarations.  #
# ------------------------- #

libiberty_INIT

AC_CHECK_DECLS([free, malloc, realloc, snprintf])
AM_LC_MESSAGES

# ----------------------- #
# Checks for structures.  #
# ----------------------- #

AC_CHECK_MEMBERS([struct stat.st_blocks, struct stat.st_blksize])

# ------------------ #
# Checks for types.  #
# ------------------ #

AC_CHECK_TYPES(socklen_t, [], [],
[#include <sys/types.h>
#include <sys/socket.h>
])

# ------------------------------------- #
# Checks for compiler characteristics.  #
# ------------------------------------- #

AC_C_CONST
AC_C_INLINE
AC_C_BIGENDIAN

# ------------------------------ #
# Checks for library functions.  #
# ------------------------------ #

AC_FUNC_MMAP
AC_FUNC_VFORK
AC_CHECK_FUNCS([getauxval getrusage getuid getgid \
		pipe poll pread pread64 pwrite resize_term \
		sbrk setpgid setpgrp setsid \
		sigaction sigprocmask sigsetmask socketpair \
		ttrace wborder wresize setlocale iconvlist libiconvlist btowc \
		setrlimit getrlimit posix_madvise waitpid \
		ptrace64 sigaltstack mkdtemp setns])
AM_LANGINFO_CODESET
GDB_AC_COMMON

# Check the return and argument types of ptrace.
GDB_AC_PTRACE

dnl AC_FUNC_SETPGRP does not work when cross compiling
dnl Instead, assume we will have a prototype for setpgrp if cross compiling.
if test "$cross_compiling" = no; then
  AC_FUNC_SETPGRP
else
  AC_CACHE_CHECK([whether setpgrp takes no argument], ac_cv_func_setpgrp_void,
    [AC_TRY_COMPILE([
#include <unistd.h>
], [
  if (setpgrp(1,1) == -1)
    exit (0);
  else
    exit (1);
], ac_cv_func_setpgrp_void=no, ac_cv_func_setpgrp_void=yes)])
if test $ac_cv_func_setpgrp_void = yes; then
  AC_DEFINE(SETPGRP_VOID, 1)
fi
fi

# Assume we'll default to using the included libiberty regex.
gdb_use_included_regex=yes

# However, if the system regex is GNU regex, then default to *not*
# using the included regex.
AC_CACHE_CHECK(
  [for GNU regex],
  [gdb_cv_have_gnu_regex],
  [AC_TRY_COMPILE(
    [#include <gnu-versions.h>],
    [#define REGEX_INTERFACE_VERSION 1
#if _GNU_REGEX_INTERFACE_VERSION != REGEX_INTERFACE_VERSION
# error "Version mismatch"
#endif],
    gdb_cv_have_gnu_regex=yes,
    gdb_cv_have_gnu_regex=no)])
if test $gdb_cv_have_gnu_regex = yes; then
  gdb_use_included_regex=no
fi

AC_ARG_WITH(included-regex,
  AS_HELP_STRING([--without-included-regex], [don't use included regex; this is the default on systems with version 2 of the GNU C library (use with caution on other system)]),
  gdb_with_regex=$withval,
  gdb_with_regex=$gdb_use_included_regex)
if test "$gdb_with_regex" = yes; then
  AC_DEFINE(USE_INCLUDED_REGEX, 1,
    [Define to 1 if the regex included in libiberty should be used.])
fi

# Check if <sys/proc.h> defines `struct thread' with a td_pcb member.
AC_CHECK_MEMBERS([struct thread.td_pcb], [], [],
[#include <sys/param.h>
#include <sys/proc.h>
])

# See if <sys/lwp.h> defines `struct lwp`.
AC_CACHE_CHECK([for struct lwp], gdb_cv_struct_lwp,
[AC_TRY_COMPILE([#include <sys/param.h>
#include <sys/lwp.h>], [struct lwp l;],
gdb_cv_struct_lwp=yes, gdb_cv_struct_lwp=no)])
if test $gdb_cv_struct_lwp = yes; then
  AC_DEFINE(HAVE_STRUCT_LWP, 1,
            [Define to 1 if your system has struct lwp.])
fi

# See if <machine/reg.h> degines `struct reg'.
AC_CACHE_CHECK([for struct reg in machine/reg.h], gdb_cv_struct_reg,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <machine/reg.h>], [struct reg r;],
gdb_cv_struct_reg=yes, gdb_cv_struct_reg=no)])
if test $gdb_cv_struct_reg = yes; then
  AC_DEFINE(HAVE_STRUCT_REG, 1,
            [Define to 1 if your system has struct reg in <machine/reg.h>.])
fi

# See if <machine/reg.h> supports the %fs and %gs i386 segment registers.
# Older i386 BSD's don't have the r_fs and r_gs members of `struct reg'.
AC_CHECK_MEMBERS([struct reg.r_fs, struct reg.r_gs], [], [],
                 [#include <machine/reg.h>])

# See if <sys/user.h> supports the %fs_base and %gs_bas amd64 segment registers.
# Older amd64 Linux's don't have the fs_base and gs_base members of
# `struct user_regs_struct'.
AC_CHECK_MEMBERS([struct user_regs_struct.fs_base, struct user_regs_struct.gs_base],
		 [], [], [#include <sys/user.h>])

# See if <sys/ptrace.h> provides the PTRACE_GETREGS request.
AC_MSG_CHECKING(for PTRACE_GETREGS)
AC_CACHE_VAL(gdb_cv_have_ptrace_getregs,
[AC_TRY_COMPILE([#include <sys/ptrace.h>],
		[PTRACE_GETREGS;],
		[gdb_cv_have_ptrace_getregs=yes],
		[gdb_cv_have_ptrace_getregs=no])])
AC_MSG_RESULT($gdb_cv_have_ptrace_getregs)
if test $gdb_cv_have_ptrace_getregs = yes; then
  AC_DEFINE(HAVE_PTRACE_GETREGS, 1,
  [Define if sys/ptrace.h defines the PTRACE_GETREGS request.])
fi

# See if <sys/ptrace.h> provides the PTRACE_GETFPXREGS request.
AC_MSG_CHECKING(for PTRACE_GETFPXREGS)
AC_CACHE_VAL(gdb_cv_have_ptrace_getfpxregs,
[AC_TRY_COMPILE([#include <sys/ptrace.h>],
		[PTRACE_GETFPXREGS;],
		[gdb_cv_have_ptrace_getfpxregs=yes],
		[gdb_cv_have_ptrace_getfpxregs=no])])
AC_MSG_RESULT($gdb_cv_have_ptrace_getfpxregs)
if test $gdb_cv_have_ptrace_getfpxregs = yes; then
  AC_DEFINE(HAVE_PTRACE_GETFPXREGS, 1,
  [Define if sys/ptrace.h defines the PTRACE_GETFPXREGS request.])
fi

# See if <sys/ptrace.h> provides the PT_GETDBREGS request.
AC_MSG_CHECKING(for PT_GETDBREGS)
AC_CACHE_VAL(gdb_cv_have_pt_getdbregs,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/ptrace.h>],
		[PT_GETDBREGS;],
		[gdb_cv_have_pt_getdbregs=yes],
		[gdb_cv_have_pt_getdbregs=no])])
AC_MSG_RESULT($gdb_cv_have_pt_getdbregs)
if test $gdb_cv_have_pt_getdbregs = yes; then
  AC_DEFINE(HAVE_PT_GETDBREGS, 1,
  [Define if sys/ptrace.h defines the PT_GETDBREGS request.])
fi

# See if <sys/ptrace.h> provides the PT_GETXMMREGS request.
AC_MSG_CHECKING(for PT_GETXMMREGS)
AC_CACHE_VAL(gdb_cv_have_pt_getxmmregs,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/ptrace.h>],
		[PT_GETXMMREGS;],
		[gdb_cv_have_pt_getxmmregs=yes],
		[gdb_cv_have_pt_getxmmregs=no])])
AC_MSG_RESULT($gdb_cv_have_pt_getxmmregs)
if test $gdb_cv_have_pt_getxmmregs = yes; then
  AC_DEFINE(HAVE_PT_GETXMMREGS, 1,
  [Define if sys/ptrace.h defines the PT_GETXMMREGS request.])
fi

# Detect which type of /proc is in use, such as for Solaris.

if test "${target}" = "${host}"; then
  case "${host}" in
  *-*-sysv4.2* | *-*-sysv5* )
      AC_DEFINE(NEW_PROC_API, 1,
      [Define if you want to use new multi-fd /proc interface.])
      ;;
  *-*-solaris2.[[6789]] | *-*-solaris2.1[[0-9]]*)
      AC_DEFINE(NEW_PROC_API, 1,
      [Define if you want to use new multi-fd /proc interface.])
      ;;
  mips-sgi-irix5*)
      # Work around <sys/proc.h> needing _KMEMUSER problem on IRIX 5.
      AC_DEFINE([_KMEMUSER], 1,
      [Define to 1 so <sys/proc.h> gets a definition of anon_hdl.  Works
       around a <sys/proc.h> problem on IRIX 5.])
      ;;
  esac
fi

if test "$ac_cv_header_sys_procfs_h" = yes; then
  BFD_HAVE_SYS_PROCFS_TYPE(gregset_t)
  BFD_HAVE_SYS_PROCFS_TYPE(fpregset_t)
  BFD_HAVE_SYS_PROCFS_TYPE(prgregset_t)
  BFD_HAVE_SYS_PROCFS_TYPE(prfpregset_t)
  BFD_HAVE_SYS_PROCFS_TYPE(prgregset32_t)
  BFD_HAVE_SYS_PROCFS_TYPE(lwpid_t)
  BFD_HAVE_SYS_PROCFS_TYPE(psaddr_t)
  BFD_HAVE_SYS_PROCFS_TYPE(prsysent_t)
  BFD_HAVE_SYS_PROCFS_TYPE(pr_sigset_t)
  BFD_HAVE_SYS_PROCFS_TYPE(pr_sigaction64_t)
  BFD_HAVE_SYS_PROCFS_TYPE(pr_siginfo64_t)


  dnl Check for broken prfpregset_t type

  dnl For Linux/i386, glibc 2.1.3 was released with a bogus
  dnl prfpregset_t type (it's a typedef for the pointer to a struct
  dnl instead of the struct itself).  We detect this here, and work
  dnl around it in gdb_proc_service.h.

  if test $bfd_cv_have_sys_procfs_type_prfpregset_t = yes; then
    AC_MSG_CHECKING(whether prfpregset_t type is broken)
    AC_CACHE_VAL(gdb_cv_prfpregset_t_broken,
      [AC_TRY_RUN([#include <sys/procfs.h>
       int main ()
       {
         if (sizeof (prfpregset_t) == sizeof (void *))
           return 1;
         return 0;
       }],
       gdb_cv_prfpregset_t_broken=no,
       gdb_cv_prfpregset_t_broken=yes,
       gdb_cv_prfpregset_t_broken=yes)])
    AC_MSG_RESULT($gdb_cv_prfpregset_t_broken)
    if test $gdb_cv_prfpregset_t_broken = yes; then
      AC_DEFINE(PRFPREGSET_T_BROKEN, 1,
      [Define if the prfpregset_t type is broken.])
    fi
  fi
fi

# Check if the compiler supports the `long long' type.

AC_CACHE_CHECK([for long long support in compiler], gdb_cv_c_long_long,
               [AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[[extern long long foo;]],
[[switch (foo & 2) { case 0: return 1; }]])],
                                  gdb_cv_c_long_long=yes,
                                  gdb_cv_c_long_long=no)])
if test $gdb_cv_c_long_long != yes; then
  # libdecnumber requires long long.
  AC_MSG_ERROR([Compiler must support long long for GDB.])
fi

# Check if the compiler and runtime support printing long longs.

AC_CACHE_CHECK([for long long support in printf],
               gdb_cv_printf_has_long_long,
               [AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
[[char buf[32];
  long long l = 0;
  l = (l << 16) + 0x0123;
  l = (l << 16) + 0x4567;
  l = (l << 16) + 0x89ab;
  l = (l << 16) + 0xcdef;
  sprintf (buf, "0x%016llx", l);
  return (strcmp ("0x0123456789abcdef", buf));]])],
                              gdb_cv_printf_has_long_long=yes,
                              gdb_cv_printf_has_long_long=no,
                              gdb_cv_printf_has_long_long=no)])
if test $gdb_cv_printf_has_long_long = yes; then
  AC_DEFINE(PRINTF_HAS_LONG_LONG, 1,
            [Define to 1 if the "%ll" format works to print long longs.])
fi

# Check if the compiler and runtime support printing decfloats.

AC_CACHE_CHECK([for decfloat support in printf],
               gdb_cv_printf_has_decfloat,
               [AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
[[char buf[64];
  _Decimal32 d32 = 1.2345df;
  _Decimal64 d64 = 1.2345dd;
  _Decimal128 d128 = 1.2345dl;
  sprintf (buf, "Decimal32: %H\nDecimal64: %D\nDecimal128: %DD", d32, d64, d128);
  return (strcmp ("Decimal32: 1.2345\nDecimal64: 1.2345\nDecimal128: 1.2345", buf));]])],
                              gdb_cv_printf_has_decfloat=yes,
                              gdb_cv_printf_has_decfloat=no,
                              gdb_cv_printf_has_decfloat=no)])
if test $gdb_cv_printf_has_decfloat = yes; then
  AC_DEFINE(PRINTF_HAS_DECFLOAT, 1,
            [Define to 1 if the "%H, %D and %DD" formats work to print decfloats.])
fi

# Check if the compiler supports the `long double' type.  We can't use
# AC_C_LONG_DOUBLE because that one does additional checks on the
# constants defined in <float.h> that fail on some systems,
# e.g. FreeBSD/i386 4.7 and OpenBSD/i386 3.6.

AC_CACHE_CHECK([for long double support in compiler], gdb_cv_c_long_double,
               [AC_COMPILE_IFELSE([AC_LANG_SOURCE([[long double foo;]])],
                                  gdb_cv_c_long_double=yes,
                                  gdb_cv_c_long_double=no)])
if test $gdb_cv_c_long_double = yes; then
  AC_DEFINE(HAVE_LONG_DOUBLE, 1,
           [Define to 1 if the compiler supports long double.])
fi

# Check if the compiler and runtime support printing long doubles.

AC_CACHE_CHECK([for long double support in printf],
               gdb_cv_printf_has_long_double,
               [AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
[[char buf[16];
  long double f = 3.141592653;
  sprintf (buf, "%Lg", f);
  return (strncmp ("3.14159", buf, 7));]])],
                              gdb_cv_printf_has_long_double=yes,
                              gdb_cv_printf_has_long_double=no,
                              gdb_cv_printf_has_long_double=no)])
if test $gdb_cv_printf_has_long_double = yes; then
  AC_DEFINE(PRINTF_HAS_LONG_DOUBLE, 1,
            [Define to 1 if the "%Lg" format works to print long doubles.])
fi

# Check if the compiler and runtime support scanning long doubles.

AC_CACHE_CHECK([for long double support in scanf],
               gdb_cv_scanf_has_long_double,
               [AC_RUN_IFELSE([AC_LANG_PROGRAM(
[[#include <stdio.h>]],
[[char *buf = "3.141592653";
  long double f = 0;
  sscanf (buf, "%Lg", &f);
  return !(f > 3.14159 && f < 3.14160);]])],
                              gdb_cv_scanf_has_long_double=yes,
                              gdb_cv_scanf_has_long_double=no,
                              gdb_cv_scanf_has_long_double=no)])
if test $gdb_cv_scanf_has_long_double = yes; then
  AC_DEFINE(SCANF_HAS_LONG_DOUBLE, 1,
            [Define to 1 if the "%Lg" format works to scan long doubles.])
fi

case ${host_os} in
aix*)
  AC_CACHE_CHECK([for -bbigtoc option], [gdb_cv_bigtoc], [
    SAVE_LDFLAGS=$LDFLAGS

    case $GCC in
    yes) gdb_cv_bigtoc=-Wl,-bbigtoc ;;
    *) gdb_cv_bigtoc=-bbigtoc ;;
    esac

    LDFLAGS=$LDFLAGS\ $gdb_cv_bigtoc
    AC_TRY_LINK([], [int i;], [], [gdb_cv_bigtoc=])
    LDFLAGS="${SAVE_LDFLAGS}"
  ])
  CONFIG_LDFLAGS="${CONFIG_LDFLAGS} ${gdb_cv_bigtoc}"
  ;;
esac

AC_MSG_CHECKING(for the dynamic export flag)
dynamic_list=false
if test "${gdb_native}" = yes; then
   # The dynamically loaded libthread_db needs access to symbols in the gdb
   # executable.  Older GNU ld supports --export-dynamic but --dynamic-list
   # may not be supported there.
   old_LDFLAGS="$LDFLAGS"
   # Older GNU ld supports --export-dynamic but --dynamic-list it does not.
   RDYNAMIC="-Wl,--dynamic-list=${srcdir}/proc-service.list"
   LDFLAGS="$LDFLAGS $RDYNAMIC"
   if test "${have_libpython}" = no; then
     AC_TRY_LINK([], [], [dynamic_list=true])
   else
     # Workaround http://bugs.python.org/issue4434 where static
     # libpythonX.Y.a would get its symbols required for
     # pythonX.Y/lib-dynload/*.so modules hidden by -Wl,--dynamic-list.
     # Problem does not happen for the recommended libpythonX.Y.so linkage.
     old_CFLAGS="$CFLAGS"
     CFLAGS="$CFLAGS $PYTHON_CFLAGS"
     old_LIBS="$LIBS"
     LIBS="$LIBS $PYTHON_LIBS"
     AC_RUN_IFELSE(
       AC_LANG_PROGRAM(
         [#include "]${have_libpython}[/Python.h"],
         [int err;
          Py_Initialize ();
          err = PyRun_SimpleString ("import itertools\n");
          Py_Finalize ();
          return err == 0 ? 0 : 1;]),
       [dynamic_list=true], [], [true])
     LIBS="$old_LIBS"
     CFLAGS="$old_CFLAGS"
   fi
   LDFLAGS="$old_LDFLAGS"
fi
if $dynamic_list; then
  found="-Wl,--dynamic-list"
  RDYNAMIC='-Wl,--dynamic-list=$(srcdir)/proc-service.list'
else
  found="-rdynamic"
  RDYNAMIC="-rdynamic"
fi
AC_SUBST(RDYNAMIC)
AC_MSG_RESULT($found)

dnl For certain native configurations, we need to check whether thread
dnl support can be built in or not.
dnl
dnl Note that we only want this if we are both native (host == target),
dnl and not doing a canadian cross build (build == host).

if test ${build} = ${host} -a ${host} = ${target} ; then
   case ${host_os} in
   solaris*)
      # See if thread_db library is around for Solaris thread debugging.
      # Note that we must explicitly test for version 1 of the library
      # because version 0 (present on Solaris 2.4 or earlier) doesn't have
      # the same API.
      AC_MSG_CHECKING(for Solaris thread debugging library)
      if test -f /usr/lib/libthread_db.so.1 ; then
         AC_MSG_RESULT(yes)
         AC_DEFINE(HAVE_THREAD_DB_LIB, 1,
         [Define if using Solaris thread debugging.])
         CONFIG_OBS="${CONFIG_OBS} sol-thread.o"
         CONFIG_SRCS="${CONFIG_SRCS} sol-thread.c"
         AC_CHECK_LIB(dl, dlopen)
	 CONFIG_LDFLAGS="${CONFIG_LDFLAGS} $RDYNAMIC"
	 # Sun randomly tweaked the prototypes in <proc_service.h>
	 # at one point.
	 AC_MSG_CHECKING(if <proc_service.h> is old)
	 AC_CACHE_VAL(gdb_cv_proc_service_is_old,[
	    AC_TRY_COMPILE([
		#include <proc_service.h>
		ps_err_e ps_pdwrite
		    (struct ps_prochandle*, psaddr_t, const void*, size_t);
	    ],, gdb_cv_proc_service_is_old=no,
	        gdb_cv_proc_service_is_old=yes)
	 ])
	 AC_MSG_RESULT($gdb_cv_proc_service_is_old)
	 if test $gdb_cv_proc_service_is_old = yes; then
	    AC_DEFINE(PROC_SERVICE_IS_OLD, 1,
            [Define if <proc_service.h> on solaris uses int instead of
             size_t, and assorted other type changes.])
	 fi
      else
         AC_MSG_RESULT(no)
      fi
      ;;
   aix*)
      AC_MSG_CHECKING(for AiX thread debugging library)
      AC_CACHE_VAL(gdb_cv_have_aix_thread_debug,
                   [AC_TRY_COMPILE([#include <sys/pthdebug.h>],
                                   [#ifndef PTHDB_VERSION_3
                                    #error
                                    #endif],
                                   gdb_cv_have_aix_thread_debug=yes,
                                   gdb_cv_have_aix_thread_debug=no)])
      AC_MSG_RESULT($gdb_cv_have_aix_thread_debug)
      if test $gdb_cv_have_aix_thread_debug = yes; then
         CONFIG_SRCS="${CONFIG_SRCS} aix-thread.c"
         CONFIG_OBS="${CONFIG_OBS} aix-thread.o"
         LIBS="$LIBS -lpthdebug"

         # Older versions of AIX do not provide the declaration for
         # the getthrds function (it appears that it was introduced
         # with AIX 6.x).
         AC_CHECK_DECLS(getthrds, [], [], [[#include <procinfo.h>]])
      fi
      ;;
   esac
   AC_SUBST(CONFIG_LDFLAGS)
fi

dnl See if we have a thread_db header file that has TD_NOTALLOC and
dnl other error codes.
if test "x$ac_cv_header_thread_db_h" = "xyes"; then
   AC_CACHE_CHECK([whether <thread_db.h> has TD_NOTALLOC],
                  gdb_cv_thread_db_h_has_td_notalloc,
     AC_TRY_COMPILE(
       [#include <thread_db.h>],
       [int i = TD_NOTALLOC;],
       gdb_cv_thread_db_h_has_td_notalloc=yes,
       gdb_cv_thread_db_h_has_td_notalloc=no
     )
   )
   AC_CACHE_CHECK([whether <thread_db.h> has TD_VERSION],
                  gdb_cv_thread_db_h_has_td_version,
     AC_TRY_COMPILE(
       [#include <thread_db.h>],
       [int i = TD_VERSION;],
       gdb_cv_thread_db_h_has_td_version=yes,
       gdb_cv_thread_db_h_has_td_version=no
     )
   )
   AC_CACHE_CHECK([whether <thread_db.h> has TD_NOTLS],
                  gdb_cv_thread_db_h_has_td_notls,
     AC_TRY_COMPILE(
       [#include <thread_db.h>],
       [int i = TD_NOTLS;],
       gdb_cv_thread_db_h_has_td_notls=yes,
       gdb_cv_thread_db_h_has_td_notls=no
     )
   )
fi
if test "x$gdb_cv_thread_db_h_has_td_notalloc" = "xyes"; then
  AC_DEFINE(THREAD_DB_HAS_TD_NOTALLOC, 1,
            [Define if <thread_db.h> has the TD_NOTALLOC error code.])
fi
if test "x$gdb_cv_thread_db_h_has_td_version" = "xyes"; then
  AC_DEFINE(THREAD_DB_HAS_TD_VERSION, 1,
            [Define if <thread_db.h> has the TD_VERSION error code.])
fi
if test "x$gdb_cv_thread_db_h_has_td_notls" = "xyes"; then
  AC_DEFINE(THREAD_DB_HAS_TD_NOTLS, 1,
            [Define if <thread_db.h> has the TD_NOTLS error code.])
fi

dnl Check if we can disable the virtual address space randomization.
dnl The functionality of setarch -R.
AC_CHECK_DECLS([ADDR_NO_RANDOMIZE],,, [#include <sys/personality.h>])
define([PERSONALITY_TEST], [AC_LANG_PROGRAM([#include <sys/personality.h>], [
#      if !HAVE_DECL_ADDR_NO_RANDOMIZE
#       define ADDR_NO_RANDOMIZE 0x0040000
#      endif
       /* Test the flag could be set and stays set.  */
       personality (personality (0xffffffff) | ADDR_NO_RANDOMIZE);
       if (!(personality (personality (0xffffffff)) & ADDR_NO_RANDOMIZE))
	   return 1])])
AC_RUN_IFELSE([PERSONALITY_TEST],
	      [have_personality=true],
	      [have_personality=false],
	      [AC_LINK_IFELSE([PERSONALITY_TEST],
			      [have_personality=true],
			      [have_personality=false])])
if $have_personality
then
    AC_DEFINE([HAVE_PERSONALITY], 1,
	      [Define if you support the personality syscall.])
fi

dnl Set the host's .gdbinit filename.
case $host_os in
  go32* | *djgpp*)
    gdbinit=gdb.ini
    ;;
  *)
    gdbinit=.gdbinit
    ;;
esac
AC_DEFINE_UNQUOTED(GDBINIT,"$gdbinit",[The .gdbinit filename.])

dnl Handle optional features that can be enabled.

# Support for --with-sysroot is a copy of GDB_AC_WITH_DIR,
# except that the argument to --with-sysroot is optional.
# --with-sysroot (or --with-sysroot=yes) sets the default sysroot path.
if test "x$with_sysroot" = xyes; then
  with_sysroot="${exec_prefix}/${target_alias}/sys-root"
fi
AC_ARG_WITH(sysroot,
  AS_HELP_STRING([--with-sysroot@<:@=DIR@:>@],
                 [search for usr/lib et al within DIR]),
  [TARGET_SYSTEM_ROOT=$withval], [TARGET_SYSTEM_ROOT=])
AC_DEFINE_DIR(TARGET_SYSTEM_ROOT, TARGET_SYSTEM_ROOT,
              [search for usr/lib et al within DIR])
AC_SUBST(TARGET_SYSTEM_ROOT)
GDB_AC_DEFINE_RELOCATABLE(TARGET_SYSTEM_ROOT, sysroot, ${ac_define_dir})

GDB_AC_WITH_DIR(SYSTEM_GDBINIT, system-gdbinit,
    [automatically load a system-wide gdbinit file],
    [])

AC_ARG_ENABLE(werror,
  AS_HELP_STRING([--enable-werror], [treat compile warnings as errors]),
  [case "${enableval}" in
     yes | y) ERROR_ON_WARNING="yes" ;;
     no | n)  ERROR_ON_WARNING="no" ;;
     *) AC_MSG_ERROR(bad value ${enableval} for --enable-werror) ;;
   esac])

# Enable -Werror by default when using gcc.  Turn it off for releases.
if test "${GCC}" = yes -a -z "${ERROR_ON_WARNING}" && $development; then
    ERROR_ON_WARNING=yes
fi

WERROR_CFLAGS=""
if test "${ERROR_ON_WARNING}" = yes ; then
    WERROR_CFLAGS="-Werror"
fi

# These options work in either C or C++ modes.
build_warnings="-Wall -Wpointer-arith \
-Wno-unused -Wunused-value -Wunused-function \
-Wno-switch -Wno-char-subscripts \
-Wempty-body"

# Now add in C and C++ specific options, depending on mode.
if test "$enable_build_with_cxx" = "yes"; then
   build_warnings="$build_warnings -Wno-sign-compare -Wno-write-strings \
-Wno-narrowing"
else
   build_warnings="$build_warnings -Wpointer-sign -Wmissing-prototypes \
-Wdeclaration-after-statement -Wmissing-parameter-type \
-Wold-style-declaration -Wold-style-definition"
fi

# Enable -Wno-format by default when using gcc on mingw since many
# GCC versions complain about %I64.
case "${host}" in
  *-*-mingw32*) build_warnings="$build_warnings -Wno-format" ;;
  *) build_warnings="$build_warnings -Wformat-nonliteral" ;;
esac

AC_ARG_ENABLE(build-warnings,
AS_HELP_STRING([--enable-build-warnings], [enable build-time compiler warnings if gcc is used]),
[case "${enableval}" in
  yes)	;;
  no)	build_warnings="-w";;
  ,*)   t=`echo "${enableval}" | sed -e "s/,/ /g"`
        build_warnings="${build_warnings} ${t}";;
  *,)   t=`echo "${enableval}" | sed -e "s/,/ /g"`
        build_warnings="${t} ${build_warnings}";;
  *)    build_warnings=`echo "${enableval}" | sed -e "s/,/ /g"`;;
esac
if test x"$silent" != x"yes" && test x"$build_warnings" != x""; then
  echo "Setting compiler warning flags = $build_warnings" 6>&1
fi])dnl
AC_ARG_ENABLE(gdb-build-warnings,
AS_HELP_STRING([--enable-gdb-build-warnings], [enable GDB specific build-time compiler warnings if gcc is used]),
[case "${enableval}" in
  yes)	;;
  no)	build_warnings="-w";;
  ,*)   t=`echo "${enableval}" | sed -e "s/,/ /g"`
        build_warnings="${build_warnings} ${t}";;
  *,)   t=`echo "${enableval}" | sed -e "s/,/ /g"`
        build_warnings="${t} ${build_warnings}";;
  *)    build_warnings=`echo "${enableval}" | sed -e "s/,/ /g"`;;
esac
if test x"$silent" != x"yes" && test x"$build_warnings" != x""; then
  echo "Setting GDB specific compiler warning flags = $build_warnings" 6>&1
fi])dnl

# The set of warnings supported by a C++ compiler is not the same as
# of the C compiler.
if test "$enable_build_with_cxx" = "yes"; then
    AC_LANG_PUSH([C++])
fi

WARN_CFLAGS=""
if test "x${build_warnings}" != x -a "x$GCC" = xyes
then
    AC_MSG_CHECKING(compiler warning flags)
    # Separate out the -Werror flag as some files just cannot be
    # compiled with it enabled.
    for w in ${build_warnings}; do
	# GCC does not complain about -Wno-unknown-warning.  Invert
	# and test -Wunknown-warning instead.
	case $w in
	-Wno-*)
		wtest=`echo $w | sed 's/-Wno-/-W/g'` ;;
	*)
		wtest=$w ;;
	esac

	case $w in
	-Werr*) WERROR_CFLAGS=-Werror ;;
	*)
	    # Check whether GCC accepts it.
	    saved_CFLAGS="$CFLAGS"
	    CFLAGS="$CFLAGS $wtest"
	    saved_CXXFLAGS="$CXXFLAGS"
	    CXXFLAGS="$CXXFLAGS $wtest"
	    AC_TRY_COMPILE([],[],WARN_CFLAGS="${WARN_CFLAGS} $w",)
	    CFLAGS="$saved_CFLAGS"
	    CXXFLAGS="$saved_CXXFLAGS"
	esac
    done
    AC_MSG_RESULT(${WARN_CFLAGS} ${WERROR_CFLAGS})
fi
AC_SUBST(WARN_CFLAGS)
AC_SUBST(WERROR_CFLAGS)

if test "$enable_build_with_cxx" = "yes"; then
   AC_LANG_POP([C++])
fi

# In the Cygwin environment, we need some additional flags.
AC_CACHE_CHECK([for cygwin], gdb_cv_os_cygwin,
[AC_EGREP_CPP(^lose$, [
#if defined (__CYGWIN__) || defined (__CYGWIN32__)
lose
#endif],[gdb_cv_os_cygwin=yes],[gdb_cv_os_cygwin=no])])


dnl Figure out which of the many generic ser-*.c files the _host_ supports.
SER_HARDWIRE="ser-base.o ser-unix.o ser-pipe.o ser-tcp.o"
case ${host} in
  *go32* ) SER_HARDWIRE=ser-go32.o ;;
  *djgpp* ) SER_HARDWIRE=ser-go32.o ;;
  *mingw32*) SER_HARDWIRE="ser-base.o ser-tcp.o ser-mingw.o" ;;
esac
AC_SUBST(SER_HARDWIRE)

# libreadline needs libuser32.a in a cygwin environment
WIN32LIBS=
if test x$gdb_cv_os_cygwin = xyes; then
    WIN32LIBS="-luser32"
    case "${target}" in
	*cygwin*) WIN32LIBS="$WIN32LIBS -limagehlp"
	;;
    esac
fi

# The ser-tcp.c module requires sockets.
case ${host} in
  *mingw32*)
    AC_DEFINE(USE_WIN32API, 1,
              [Define if we should use the Windows API, instead of the
	       POSIX API.  On Windows, we use the Windows API when
	       building for MinGW, but the POSIX API when building
	       for Cygwin.])
    WIN32LIBS="$WIN32LIBS -lws2_32"
    ;;
esac
AC_SUBST(WIN32LIBS)

# Add ELF support to GDB, but only if BFD includes ELF support.
GDB_AC_CHECK_BFD([for ELF support in BFD], gdb_cv_var_elf,
                 [bfd_get_elf_phdr_upper_bound (NULL)], elf-bfd.h)
if test $gdb_cv_var_elf = yes; then
  CONFIG_OBS="$CONFIG_OBS elfread.o stap-probe.o dtrace-probe.o"
  AC_DEFINE(HAVE_ELF, 1,
	    [Define if ELF support should be included.])
  # -ldl is provided by bfd/Makfile.am (LIBDL) <PLUGINS>.
  if test "$plugins" = "yes"; then
    AC_SEARCH_LIBS(dlopen, dl)
  fi
fi

# Add macho support to GDB, but only if BFD includes it.
GDB_AC_CHECK_BFD([for Mach-O support in BFD], gdb_cv_var_macho,
                 [bfd_mach_o_lookup_command (NULL, 0, NULL)], mach-o.h)
if test $gdb_cv_var_macho = yes; then
  CONFIG_OBS="$CONFIG_OBS machoread.o"
fi

# Add any host-specific objects to GDB.
CONFIG_OBS="${CONFIG_OBS} ${gdb_host_obs}"

# If building on ELF, look for lzma support for embedded compressed debug info.
if test $gdb_cv_var_elf = yes; then
  AC_ARG_WITH(lzma,
    AS_HELP_STRING([--with-lzma], [support lzma compression (auto/yes/no)]),
    [], [with_lzma=auto])
  AC_MSG_CHECKING([whether to use lzma])
  AC_MSG_RESULT([$with_lzma])

  if test "${with_lzma}" != no; then
    AC_LIB_HAVE_LINKFLAGS([lzma], [], [#include "lzma.h"],
			  [lzma_index_iter iter;
			   lzma_index_iter_init (&iter, 0);
			   lzma_mf_is_supported (LZMA_MF_HC3);])
    if test "$HAVE_LIBLZMA" != yes; then
      if test "$with_lzma" = yes; then
        AC_MSG_ERROR([missing liblzma for --with-lzma])
      fi
    fi
  fi
fi

LIBGUI="../libgui/src/libgui.a"
GUI_CFLAGS_X="-I${srcdir}/../libgui/src"
AC_SUBST(LIBGUI)
AC_SUBST(GUI_CFLAGS_X)

WIN32LDAPP=
AC_SUBST(WIN32LIBS)
AC_SUBST(WIN32LDAPP)

case "${host}" in
*-*-cygwin* | *-*-mingw* )
    configdir="win"
    ;;
*)
    configdir="unix"
    ;;
esac

GDBTKLIBS=
if test "${enable_gdbtk}" = "yes"; then

    # Gdbtk must have an absolute path to srcdir in order to run
    # properly when not installed.
    here=`pwd`
    cd ${srcdir}
    GDBTK_SRC_DIR=`pwd`
    cd $here

    SC_PATH_TCLCONFIG

    # If $no_tk is nonempty, then we can't do Tk, and there is no
    # point to doing Tcl.
    SC_PATH_TKCONFIG

    if test -z "${no_tcl}" -a -z "${no_tk}"; then
	SC_LOAD_TCLCONFIG

        # Check for in-tree tcl
        here=`pwd`
        cd ${srcdir}/..
        topdir=`pwd`
        cd ${here}

        intree="no"
        if test "${TCL_SRC_DIR}" = "${topdir}/tcl"; then
          intree="yes"
        fi

        # Find Tcl private headers
        if test x"${intree}" = xno; then
          CY_AC_TCL_PRIVATE_HEADERS
	  TCL_INCLUDE="${TCL_INCLUDE_SPEC} ${TCL_PRIVATE_INCLUDE}"
          TCL_LIBRARY="${TCL_LIB_SPEC}"
          TCL_DEPS=""
        else
          # If building tcl in the same src tree, private headers
          # are not needed, but we need to be sure to use the right
          # headers library
	  TCL_INCLUDE="-I${TCL_SRC_DIR}/generic"
          TCL_LIBRARY="${TCL_BUILD_LIB_SPEC}"
          TCL_DEPS="../tcl/${configdir}${TCL_LIB_FILE}"
        fi
	AC_SUBST(TCL_INCLUDE)
	AC_SUBST(TCL_LIBRARY)
        AC_SUBST(TCL_DEPS)

	SC_LOAD_TKCONFIG

        # Check for in-tree Tk
        intree="no"
        if test "${TK_SRC_DIR}" = "${topdir}/tk"; then
          intree="yes"
        fi

        # Find Tk private headers
        if test x"${intree}" = xno; then
          CY_AC_TK_PRIVATE_HEADERS
	  TK_INCLUDE="${TK_INCLUDE_SPEC} ${TK_PRIVATE_INCLUDE}"
	  TK_LIBRARY=${TK_LIB_SPEC}
          TK_DEPS=""
        else
          TK_INCLUDE="-I${TK_SRC_DIR}/generic"
          TK_LIBRARY="${TK_BUILD_LIB_SPEC}"
          TK_DEPS="../tk/${configdir}/${TK_LIB_FILE}"
        fi
	AC_SUBST(TK_INCLUDE)
	AC_SUBST(TK_LIBRARY)
	AC_SUBST(TK_DEPS)
	AC_SUBST(TK_XINCLUDES)

        ENABLE_CFLAGS="${ENABLE_CFLAGS} \$(SUBDIR_GDBTK_CFLAGS)"

	# Include some libraries that Tcl and Tk want.
	TCL_LIBS='$(LIBGUI) $(TK) $(TCL) $(X11_LDFLAGS) $(X11_LIBS)'
	# Yes, the ordering seems wrong here.  But it isn't.
	# TK_LIBS is the list of libraries that need to be linked
	# after Tcl/Tk.  Note that this isn't put into LIBS.  If it
	# were in LIBS then any link tests after this point would
	# try to include things like `$(LIBGUI)', which wouldn't work.
	GDBTKLIBS="${TCL_LIBS} ${TK_LIBS}"

        CONFIG_OBS="${CONFIG_OBS} \$(SUBDIR_GDBTK_OBS)"
        CONFIG_DEPS="${CONFIG_DEPS} \$(SUBDIR_GDBTK_DEPS)"
        CONFIG_SRCS="${CONFIG_SRCS} \$(SUBDIR_GDBTK_SRCS)"
	CONFIG_ALL="${CONFIG_ALL} all-gdbtk"
	CONFIG_CLEAN="${CONFIG_CLEAN} clean-gdbtk"
	CONFIG_INSTALL="${CONFIG_INSTALL} install-gdbtk"
	CONFIG_UNINSTALL="${CONFIG_UNINSTALL} uninstall-gdbtk"

	if test x$gdb_cv_os_cygwin = xyes; then
	  WIN32LIBS="${WIN32LIBS} -lshell32 -lgdi32 -lcomdlg32 -ladvapi32"
	  WIN32LDAPP="-Wl,--subsystem,console"
	  CONFIG_OBS="${CONFIG_OBS} gdbres.o"
	fi

        AC_CONFIG_SUBDIRS(gdbtk)
    fi
fi

AC_SUBST(X_CFLAGS)
AC_SUBST(X_LDFLAGS)
AC_SUBST(X_LIBS)
AC_SUBST(GDBTKLIBS)
AC_SUBST(GDBTK_CFLAGS)
AC_SUBST(GDBTK_SRC_DIR)

AC_PATH_X

# Unlike the sim directory, whether a simulator is linked is controlled by
# presence of a gdb_sim definition in the target configure.tgt entry.
# This code just checks for a few cases where we'd like to ignore those
# definitions, even when they're present in the '.mt' file.  These cases
# are when --disable-sim is specified, or if the simulator directory is
# not part of the source tree.
#
AC_ARG_ENABLE(sim,
AS_HELP_STRING([--enable-sim], [link gdb with simulator]),
[echo "enable_sim = $enable_sim";
 echo "enableval = ${enableval}";
 case "${enableval}" in
  yes) ignore_sim=false ;;
  no)  ignore_sim=true ;;
  *)   ignore_sim=false ;;
 esac],
[ignore_sim=false])

if test ! -d "${srcdir}/../sim"; then
  ignore_sim=true
fi

SIM=
SIM_OBS=
if test "${ignore_sim}" = "false"; then
  if test x"${gdb_sim}" != x ; then
    SIM="${gdb_sim}"
    SIM_OBS="remote-sim.o"
    AC_DEFINE(WITH_SIM, 1, [Define if the simulator is being linked in.])
  fi
fi
AC_SUBST(SIM)
AC_SUBST(SIM_OBS)

AC_SUBST(ENABLE_CFLAGS)
AC_SUBST(PROFILE_CFLAGS)

AC_SUBST(CONFIG_OBS)
AC_SUBST(CONFIG_DEPS)
AC_SUBST(CONFIG_SRCS)
AC_SUBST(CONFIG_ALL)
AC_SUBST(CONFIG_CLEAN)
AC_SUBST(CONFIG_INSTALL)
AC_SUBST(CONFIG_UNINSTALL)

# List of host floatformats.
AC_DEFINE_UNQUOTED(GDB_HOST_FLOAT_FORMAT,$gdb_host_float_format,[Host float floatformat])
AC_DEFINE_UNQUOTED(GDB_HOST_DOUBLE_FORMAT,$gdb_host_double_format,[Host double floatformat])
AC_DEFINE_UNQUOTED(GDB_HOST_LONG_DOUBLE_FORMAT,$gdb_host_long_double_format,[Host long double floatformat])

# target_subdir is used by the testsuite to find the target libraries.
target_subdir=
if test "${host}" != "${target}"; then
    target_subdir="${target_alias}/"
fi
AC_SUBST(target_subdir)

frags=
if test "${gdb_native}" = "yes"; then
  host_makefile_frag=${srcdir}/config/${gdb_host_cpu}/${gdb_host}.mh
  if test ! -f ${host_makefile_frag}; then
    AC_MSG_ERROR("*** Gdb does not support native target ${host}")
  fi
  frags="$frags $host_makefile_frag"
else
  host_makefile_frag=/dev/null
fi

AC_SUBST_FILE(host_makefile_frag)
AC_SUBST(frags)

changequote(,)dnl
if test "${gdb_native}" = "yes"; then
# We pick this up from the host configuration file (.mh) because we
# do not have a native configuration Makefile fragment.
nativefile=`sed -n '
s/NAT_FILE[ 	]*=[ 	]*\([^ 	]*\)/\1/p
' ${host_makefile_frag}`
fi
changequote([,])

if test x"${gdb_osabi}" != x ; then
    AC_DEFINE_UNQUOTED(GDB_OSABI_DEFAULT, $gdb_osabi,
		       [Define to the default OS ABI for this configuration.])
fi

# Enable multi-ice-gdb-server.
AC_ARG_ENABLE(multi-ice,
AS_HELP_STRING([--enable-multi-ice], [build the multi-ice-gdb-server]),
  [case $enableval in
    yes | no)
      ;;
    *) AC_MSG_ERROR([bad value $enableval for --enable-multi-ice]) ;;
  esac])
if test "x$enable_multi_ice" = xyes; then
   AC_CONFIG_SUBDIRS(multi-ice)
fi

AC_ARG_ENABLE(gdbserver,
AS_HELP_STRING([--enable-gdbserver],
               [automatically build gdbserver (yes/no/auto, default is auto)]),
[case "${enableval}" in
  yes| no|auto) ;;
  *) AC_MSG_ERROR(bad value ${enableval} for --enable-gdbserver option) ;;
esac],[enable_gdbserver=auto])

# We only build gdbserver automatically in a native configuration, and
# only if the user did not explicitly disable its build.
if test "$gdb_native" = "yes" -a "$enable_gdbserver" != "no"; then
  AC_MSG_CHECKING(whether gdbserver is supported on this host)
  if test "x$build_gdbserver" = xyes; then
    AC_MSG_RESULT(yes)
    AC_CONFIG_SUBDIRS(gdbserver)
    gdbserver_build_enabled=yes
  else
    AC_MSG_RESULT(no)
  fi
fi

# If the user explicitly request the gdbserver to be built, verify that
# we were in fact able to enable it.
if test "$enable_gdbserver" = "yes" -a "$gdbserver_build_enabled" != "yes"; then
  AC_MSG_ERROR(Automatic gdbserver build is not supported for this configuration)
fi

# Check for babeltrace and babeltrace-ctf
AC_ARG_WITH(babeltrace,
  AC_HELP_STRING([--with-babeltrace], [include babeltrace support (auto/yes/no)]),
  [], [with_babeltrace=auto])
AC_MSG_CHECKING([whether to use babeltrace])
AC_MSG_RESULT([$with_babeltrace])

if test "x$with_babeltrace" = "xno"; then
  AC_MSG_WARN([babletrace support disabled; GDB is unable to read CTF data.])
else
  # Append -Werror to CFLAGS so that configure can catch the warning
  # "assignment from incompatible pointer type", which is related to
  # the babeltrace change from 1.0.3 to 1.1.0.  Babeltrace 1.1.0 works
  # in GDB, while babeltrace 1.0.3 is broken.
  # AC_LIB_HAVE_LINKFLAGS may modify CPPFLAGS in it, so it should be
  # safe to save and restore CFLAGS here.
  saved_CFLAGS=$CFLAGS
  CFLAGS="$CFLAGS -Werror"
  AC_LIB_HAVE_LINKFLAGS([babeltrace], [babeltrace-ctf],
			[#include <babeltrace/babeltrace.h>
			 #include <babeltrace/ctf/events.h>
			 #include <babeltrace/ctf/iterator.h>],
			[struct bt_iter_pos *pos = bt_iter_get_pos (bt_ctf_get_iter (NULL));
			struct bt_ctf_event *event = NULL;
			const struct bt_definition *scope;

			bt_iter_set_pos (bt_ctf_get_iter (NULL), pos);
			scope = bt_ctf_get_top_level_scope (event,
			      				   BT_STREAM_EVENT_HEADER);
		        bt_ctf_get_uint64 (bt_ctf_get_field (event, scope, "id"));
			])
  CFLAGS=$saved_CFLAGS

  if test "$HAVE_LIBBABELTRACE" != yes; then
     if test "$with_babeltrace" = yes; then
       AC_MSG_ERROR([babeltrace is missing or unusable])
     else
       AC_MSG_WARN([babeltrace is missing or unusable; GDB is unable to read CTF data.])
     fi
  fi
fi

# If nativefile (NAT_FILE) is not set in config/*/*.m[ht] files, we link
# to an empty version.

files=
links=

rm -f nm.h
if test "${nativefile}" != ""; then
    case "${nativefile}" in
      nm-*.h ) GDB_NM_FILE="config/${gdb_host_cpu}/${nativefile}" ;;
      * ) GDB_NM_FILE="${nativefile}"
    esac
    files="${files} ${GDB_NM_FILE}"
    links="${links} nm.h"
    AC_DEFINE_UNQUOTED(GDB_NM_FILE, "${GDB_NM_FILE}", [nativefile])
fi
AC_SUBST(GDB_NM_FILE)

AC_LINK_FILES($files, $links)

dnl Check for exe extension set on certain hosts (e.g. Win32)
AC_EXEEXT

dnl  Detect the character set used by this host.
dnl  At the moment, we just assume it's UTF-8.
AC_DEFINE(GDB_DEFAULT_HOST_CHARSET, "UTF-8",
          [Define to be a string naming the default host character set.])

GDB_AC_TRANSFORM([gdb], [GDB_TRANSFORM_NAME])
GDB_AC_TRANSFORM([gcore], [GCORE_TRANSFORM_NAME])
AC_CONFIG_FILES([gcore], [chmod +x gcore])

AC_OUTPUT(Makefile gdb-gdb.gdb doc/Makefile data-directory/Makefile,
[
case x$CONFIG_HEADERS in
xconfig.h:config.in)
echo > stamp-h ;;
esac
])

exit 0