configure.in: Clean up handling of --enable-version-specific-runtime-libs and related...

[thirdparty/gcc.git] / libobjc / configure.in

# Process this file with autoconf to produce a configure script.
#   Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2003, 2004
#   Free Software Foundation, Inc.
#   Originally contributed by Dave Love (d.love@dl.ac.uk).
#
#This file is part of GCC.
#
#GCC is free software; you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation; either version 2, or (at your option)
#any later version.
#
#GCC is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#GNU General Public License for more details.
#
#You should have received a copy of the GNU General Public License
#along with GCC; see the file COPYING.  If not, write to
#the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
#02111-1307, USA.

AC_PREREQ(2.13)
AC_INIT(objc/objc.h)
AC_CONFIG_HEADER(config.h)

# This works around the fact that libtool configuration may change LD
# for this particular configuration, but some shells, instead of
# keeping the changes in LD private, export them just because LD is
# exported.
ORIGINAL_LD_FOR_MULTILIBS=$LD

dnl Default to --enable-multilib
AC_ARG_ENABLE(multilib,
  [  --enable-multilib       build hella library versions (default)],
  [case "${enableval}" in
    yes) multilib=yes ;;
    no)  multilib=no ;;
    *)   AC_MSG_ERROR(bad value ${enableval} for multilib option) ;;
   esac], [multilib=yes])dnl

# When building with srcdir == objdir, links to the source files will
# be created in directories within the target_subdir.  We have to
# adjust toplevel_srcdir accordingly, so that configure finds
# install-sh and other auxiliary files that live in the top-level
# source directory.
if test "${srcdir}" = "."; then
  if test -z "${with_target_subdir}"; then
    toprel=".."
  else
    if test "${with_target_subdir}" != "."; then
      toprel="${with_multisrctop}../.."
    else
      toprel="${with_multisrctop}.."
    fi
  fi
else
  toprel=".."
fi
AC_CONFIG_AUX_DIR(${srcdir}/$toprel)
toplevel_srcdir=\${top_srcdir}/$toprel
AC_SUBST(toplevel_srcdir)

AC_CANONICAL_SYSTEM
_GCC_TOPLEV_NONCANONICAL_TARGET
AC_SUBST(target_noncanonical)

# Export build and source directories.
# These need to be absolute paths, yet at the same time need to
# canonicalize only relative paths, because then amd will not unmount
# drives. Thus the use of PWDCMD: set it to 'pawd' or 'amq -w' if using amd.
glibcpp_builddir=`${PWDCMD-pwd}`
case $srcdir in
[\\/$]* | ?:[\\/]*) glibcpp_srcdir=${srcdir} ;;
*) glibcpp_srcdir=`cd "$srcdir" && ${PWDCMD-pwd} || echo "$srcdir"` ;;
esac
AC_SUBST(glibcpp_builddir)
AC_SUBST(glibcpp_srcdir)

# Will set LN_S to either 'ln -s' or 'ln'.  With autoconf 2.50+, can also
# be 'cp -p' if linking isn't available.
#ac_cv_prog_LN_S='cp -p'
AC_PROG_LN_S

# We use these options to decide which functions to include.
AC_ARG_WITH(target-subdir,
[  --with-target-subdir=SUBDIR
                           configuring in a subdirectory])
AC_ARG_WITH(cross-host,
[  --with-cross-host=HOST  configuring with a cross compiler])

  # Never versions of autoconf add an underscore to these functions.
  # Prevent future problems ...
  ifdef([AC_PROG_CC_G],[],[define([AC_PROG_CC_G],defn([_AC_PROG_CC_G]))])
  ifdef([AC_PROG_CC_GNU],[],[define([AC_PROG_CC_GNU],defn([_AC_PROG_CC_GNU]))])
  ifdef([AC_PROG_CXX_G],[],[define([AC_PROG_CXX_G],defn([_AC_PROG_CXX_G]))])
  ifdef([AC_PROG_CXX_GNU],[],[define([AC_PROG_CXX_GNU],defn([_AC_PROG_CXX_GNU]))])

#  AC_PROG_CC

# FIXME: We temporarily define our own version of AC_PROG_CC.  This is
# copied from autoconf 2.12, but does not call AC_PROG_CC_WORKS.  We
# are probably using a cross compiler, which will not be able to fully
# link an executable.  This should really be fixed in autoconf
# itself.

AC_DEFUN(LIB_AC_PROG_CC,
[AC_BEFORE([$0], [AC_PROG_CPP])dnl
dnl Fool anybody using AC_PROG_CC.
AC_PROVIDE([AC_PROG_CC])
AC_CHECK_PROG(CC, gcc, gcc)
if test -z "$CC"; then
  AC_CHECK_PROG(CC, cc, cc, , , /usr/ucb/cc)
  test -z "$CC" && AC_MSG_ERROR([no acceptable cc found in \$PATH])
fi

AC_PROG_CC_GNU

if test $ac_cv_prog_gcc = yes; then
  GCC=yes
dnl Check whether -g works, even if CFLAGS is set, in case the package
dnl plays around with CFLAGS (such as to build both debugging and
dnl normal versions of a library), tasteless as that idea is.
  ac_test_CFLAGS="${CFLAGS+set}"
  ac_save_CFLAGS="$CFLAGS"
  CFLAGS=
  AC_PROG_CC_G
  if test "$ac_test_CFLAGS" = set; then
    CFLAGS="$ac_save_CFLAGS"
  elif test $ac_cv_prog_cc_g = yes; then
    CFLAGS="-g -O2"
  else
    CFLAGS="-O2"
  fi
else
  GCC=
  test "${CFLAGS+set}" = set || CFLAGS="-g"
fi
])

LIB_AC_PROG_CC

AC_CHECK_TOOL(AS, as)
AC_CHECK_TOOL(AR, ar)
AC_CHECK_TOOL(RANLIB, ranlib, ranlib-not-found-in-path-error)
AC_PROG_INSTALL


# Process the option "--enable-version-specific-runtime-libs"
AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
AC_ARG_ENABLE(version-specific-runtime-libs,
[  --enable-version-specific-runtime-libs    Specify that runtime libraries should be installed in a compiler-specific directory ],
[case "$enableval" in
 yes) version_specific_libs=yes ;;
 no)  version_specific_libs=no ;;
 *)   AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
 esac],
[version_specific_libs=no])
# Option set, now we can test it.
AC_MSG_RESULT($version_specific_libs)

gcc_version_trigger=${srcdir}/../gcc/version.c
gcc_version_full=`grep version_string ${gcc_version_trigger} | sed -e 's/.*\"\([[^ \"]]*\)[[ \"]].*/\1/'`
gcc_version=`echo ${gcc_version_full} | sed -e 's/\([^ ]*\) .*/\1/'`
AC_SUBST(gcc_version)
AC_SUBST(gcc_version_trigger)

# Calculate glibcpp_toolexecdir, glibcpp_toolexeclibdir
case ${version_specific_libs} in
  yes)
    # Need the gcc compiler version to know where to install libraries
    # and header files if --enable-version-specific-runtime-libs option
    # is selected.
    glibcpp_toolexecdir='$(libdir)/gcc/$(target_noncanonical)'
    glibcpp_toolexeclibdir='$(toolexecdir)/'${gcc_version}'$(MULTISUBDIR)'
    ;;
  no)
    if test -n "$with_cross_host" &&
       test x"$with_cross_host" != x"no"; then
      glibcpp_toolexecdir='$(exec_prefix)/$(target_noncanonical)'
      glibcpp_toolexeclibdir='$(toolexecdir)/lib'
    else
      # Install a library built with a cross compiler in tooldir, not libdir.
      glibcpp_toolexecdir='$(libdir)/gcc-lib/$(target_noncanonical)'
      glibcpp_toolexeclibdir='$(libdir)'
    fi
    multi_os_directory=`$CC -print-multi-os-directory`
    case $multi_os_directory in
      .) ;; # Avoid trailing /.
      *) glibcpp_toolexeclibdir=$glibcpp_toolexeclibdir/$multi_os_directory ;;
    esac
    ;;
esac
AC_SUBST(glibcpp_toolexecdir)
AC_SUBST(glibcpp_toolexeclibdir)

glibcpp_prefixdir=${prefix}
AC_SUBST(glibcpp_prefixdir)

dnl Checks for programs.

# Disable shared libs by default
AC_DISABLE_SHARED
# Enable Win32 DLL on MS Windows - FIXME
AC_LIBTOOL_WIN32_DLL

AC_PROG_LIBTOOL

dnl These should be inherited in the recursive make, but ensure they are
dnl defined:
test "$AR" || AR=ar
AC_SUBST(AR)
if test "$RANLIB"; then :
  AC_SUBST(RANLIB)
else
  AC_PROG_RANLIB
fi
AC_PROG_INSTALL
AC_PROG_MAKE_SET

dnl we need the following definitions because AC_PROG_LIBTOOL relies on them
PACKAGE=libobjc
dnl version is pulled out to make it a bit easier to change using sed.
VERSION=1:0:0
AC_SUBST(VERSION)

dnl Checks for header files.
# Sanity check for the cross-compilation case:
AC_CHECK_HEADER(stdio.h,:,
  [AC_MSG_ERROR([Can't find stdio.h.
You must have a usable C system for the target already installed, at least
including headers and, preferably, the library, before you can configure
the Objective C runtime system.  If necessary, install gcc now with 
\`LANGUAGES=c', then the target library, then build with \`LANGUAGES=objc'.])])

AC_HEADER_STDC

AC_CHECK_HEADERS(sched.h)

# Determine CFLAGS for gthread.

AC_CACHE_CHECK([for gthread cflags],objc_cv_gthread_flags,
[if test -f "$r"/gcc/Makefile
then
  objc_cv_gthread_flags=`grep \^GTHREAD_FLAGS "$r"/gcc/Makefile | awk -F= '{ print $2 }'`
else
  AC_MSG_ERROR([not found])
fi])
GTHREAD_FLAGS=$objc_cv_gthread_flags
AC_SUBST(GTHREAD_FLAGS)

AC_ARG_ENABLE(objc-gc,
[  --enable-objc-gc       enable the use of Boehm's garbage collector with
                          the GNU Objective-C runtime.],
if [[[ x$enable_objc_gc = xno ]]]; then
        OBJC_BOEHM_GC=''
else
        OBJC_BOEHM_GC=libobjc_gc.la
fi,
OBJC_BOEHM_GC='')
AC_SUBST(OBJC_BOEHM_GC)


# We need multilib support, but only if configuring for the target.
AC_OUTPUT(Makefile,
 [test -z "$CONFIG_HEADERS" || echo timestamp > stamp-h
if test -n "$CONFIG_FILES"; then
  if test -n "${with_target_subdir}"; then
    # FIXME: We shouldn't need to set ac_file
    ac_file=Makefile
    LD="${ORIGINAL_LD_FOR_MULTILIBS}"
    . ${toplevel_srcdir}/config-ml.in
  fi
fi],
srcdir=${srcdir}
host=${host}
target=${target}
with_target_subdir=${with_target_subdir}
with_multisubdir=${with_multisubdir}
ac_configure_args="--enable-multilib ${ac_configure_args}"
toplevel_srcdir=${toplevel_srcdir}
CONFIG_SHELL=${CONFIG_SHELL-/bin/sh}
ORIGINAL_LD_FOR_MULTILIBS="${ORIGINAL_LD_FOR_MULTILIBS}"
)