configure.in (AC_PREREQ): Update to 2.13.

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

# Process this file with autoconf to produce a configure script.
#   Copyright (C) 1995, 1997, 1998, 1999 Free Software Foundation, Inc.
#   Contributed by Dave Love (d.love@dl.ac.uk).
#
#This file is part of GNU Objective C.
#
#GNU Objective C 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.
#
#GNU Objective C 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 GNU Objective C; 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)

if test "${srcdir}" = "." ; then
  if test "${with_target_subdir}" != "." ; then
    topsrcdir=${with_multisrctop}../..
  else
    topsrcdir=${with_multisrctop}..
  fi
else
  topsrcdir=${srcdir}/..
fi
dnl This is needed for a multilibbed build in the source tree so
dnl that install-sh and config.sub get found.
AC_CONFIG_AUX_DIR($topsrcdir)

# We have to handle 3 cases -- native, cross and canadian cross -- and
# the extension returned from this macro needs to be treated as a possible
# scenario and not the only one.
AC_EXEEXT

# If the language specific compiler does not exist, but the "gcc" directory 
# does, we do not build anything. Note, $r is set by the top-level Makefile.
# Note that when we look for the compiler, we search both with and without
# extension to handle cross and canadian cross builds. 
compiler_name=cc1obj
rm -f skip-this-dir
AC_MSG_CHECKING(if compiler $compiler_name has been built)
AC_CACHE_VAL(objc_cv_compiler_exists,
[objc_cv_compiler_exists=yes
if test -n "$r"; then
  if test -d "$r"/gcc; then
    if test -f "$r"/gcc/$compiler_name \
       || test -f "$r"/gcc/$compiler_name$EXEEXT; then
      true
    else
      objc_cv_compiler_exists=no
      echo "rm -f config.cache config.log multilib.out" > skip-this-dir
    fi
  fi
fi
])
AC_MSG_RESULT($objc_cv_compiler_exists)
if test x$objc_cv_compiler_exists = xno
then
  rm -f Makefile conftest* confdefs* core
  exit 0
fi

dnl Checks for programs.
# For ObjC we'll set CC to point at the built gcc, but this will get it into
# the makefiles
AC_PROG_CC

test "$AR" || AR=ar
AC_SUBST(AR)
if test "$RANLIB"; then :
  AC_SUBST(RANLIB)
else
  AC_PROG_RANLIB
fi
AC_PROG_INSTALL

dnl Checks for libraries.

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

# Determine the name of the GCC thread file.

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

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.a
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
    . ${topsrcdir}/config-ml.in
  fi
fi],
srcdir=${srcdir}
host=${host}
target=${target}
with_target_subdir=${with_target_subdir}
with_multisubdir=${with_multisubdir}
ac_configure_args="--enable-multilib ${ac_configure_args}"
CONFIG_SHELL=${CONFIG_SHELL-/bin/sh}
topsrcdir=${topsrcdir}
)

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