libobjc/configure.ac - gcc - Git at Google

 # Process this file with autoconf to produce a configure script.
 #   Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2003, 2004
 #   2005, 2006, 2009 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 3, 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 COPYING3.  If not see
 #<http://www.gnu.org/licenses/>.

 AC_PREREQ(2.64)
 AC_INIT(package-unused, version-unused,, libobjc)
 AC_CONFIG_SRCDIR([objc/objc.h])
 GCC_TOPLEV_SUBDIRS

 # We need the following definitions because AC_PROG_LIBTOOL relies on them
 PACKAGE=libobjc
 # Version is pulled out to make it a bit easier to change using sed.
 VERSION=3:0:0
 AC_SUBST(VERSION)

 # 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

 # -------
 # Options
 # -------

 # 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])

 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 "$enableval" in
  yes) version_specific_libs=yes ;;
  no)  version_specific_libs=no ;;
  *)   AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
  esac],
 [version_specific_libs=no])
 AC_MSG_RESULT($version_specific_libs)

 AC_ARG_ENABLE(objc-gc,
 [  --enable-objc-gc       enable the use of Boehm's garbage collector with
                           the GNU Objective-C runtime.],
 [case $enable_objc_gc in
   no)
     OBJC_BOEHM_GC=''
     OBJC_BOEHM_GC_INCLUDES=''
     ;;
   *)
     OBJC_BOEHM_GC=libobjc_gc.la
     OBJC_BOEHM_GC_INCLUDES='-I$(top_srcdir)/../boehm-gc/include -I../boehm-gc/include'
     ;;
 esac],
 [OBJC_BOEHM_GC=''; OBJC_BOEHM_GC_INCLUDES=''])
 AC_SUBST(OBJC_BOEHM_GC)
 AC_SUBST(OBJC_BOEHM_GC_INCLUDES)

 # -----------
 # Directories
 # -----------

 # Find the rest of the source tree framework.
 AM_ENABLE_MULTILIB(, ..)

 AC_CANONICAL_SYSTEM
 ACX_NONCANONICAL_TARGET

 # Export source directory.
 # 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.
 case $srcdir in
   [\\/$]* | ?:[\\/]*) glibcpp_srcdir=${srcdir} ;;
   *) glibcpp_srcdir=`cd "$srcdir" && ${PWDCMD-pwd} || echo "$srcdir"` ;;
 esac
 AC_SUBST(glibcpp_srcdir)

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

 # Figure out if we want to name the include directory and the
 #  library name changes differently.
 includedirname=include
 libsuffix=
 case "${host}" in
   *-darwin*)
     # Darwin is the only target so far that needs a different include directory.
     includedirname=include-gnu-runtime
     libsuffix=-gnu
     ;;
 esac
 AC_SUBST(includedirname)
 AC_SUBST(libsuffix)

 AC_CONFIG_HEADERS(config.h)

 # --------
 # Programs
 # --------

 GCC_NO_EXECUTABLES

 # We must force CC to /not/ be a precious variable; otherwise
 # the wrong, non-multilib-adjusted value will be used in multilibs.
 # As a side effect, we have to subst CFLAGS ourselves.
 m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
 m4_define([_AC_ARG_VAR_PRECIOUS],[])
 AC_PROG_CC
 m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])

 # extra LD Flags which are required for targets
 ACX_LT_HOST_FLAGS
 case "${host}" in
   *-darwin*)
     # Darwin needs -single_module when linking libobjc
     extra_ldflags_libobjc='$(lt_host_flags) -Wl,-single_module'
     ;;
   *-cygwin*|*-mingw*)
     # Tell libtool to build DLLs on Windows
     extra_ldflags_libobjc='$(lt_host_flags)'
     ;;
 esac
 AC_SUBST(extra_ldflags_libobjc)

 AC_SUBST(CFLAGS)

 AC_CHECK_TOOL(AS, as)
 AC_CHECK_TOOL(AR, ar)
 AC_CHECK_TOOL(RANLIB, ranlib, :)
 AC_PROG_INSTALL

 AM_MAINTAINER_MODE

 # Enable Win32 DLL on MS Windows - FIXME
 AC_LIBTOOL_WIN32_DLL

 AC_PROG_LIBTOOL

 AM_PROG_CC_C_O

 AC_PROG_MAKE_SET

 # -------
 # Headers
 # -------

 # 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)

 # -----------
 # Miscellanea
 # -----------

 AC_MSG_CHECKING([for thread model used by GCC])
 target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'`
 AC_MSG_RESULT([$target_thread_file])

 if test $target_thread_file != single; then
   AC_DEFINE(HAVE_GTHR_DEFAULT, 1,
         [Define if the compiler has a thread header that is non single.])
 fi

 # Check if we have thread-local storage
 GCC_CHECK_TLS

 AC_MSG_CHECKING([for exception model to use])
 AC_LANG_PUSH(C)
 AC_ARG_ENABLE(sjlj-exceptions,
   AS_HELP_STRING([--enable-sjlj-exceptions],
                  [force use of builtin_setjmp for exceptions]),
 [:],
 [dnl Botheration.  Now we've got to detect the exception model.
 dnl Link tests against libgcc.a are problematic since -- at least
 dnl as of this writing -- we've not been given proper -L bits for
 dnl single-tree newlib and libgloss.
 dnl
 dnl This is what AC_TRY_COMPILE would do if it didn't delete the
 dnl conftest files before we got a change to grep them first.
 cat > conftest.$ac_ext << EOF
 [#]line __oline__ "configure"
 @interface Frob
 @end
 @implementation Frob
 @end
 int proc();
 int foo()
 {
   @try {
    return proc();
   }
   @catch (Frob* ex) {
     return 0;
   }
 }
 EOF
 old_CFLAGS="$CFLAGS"
 dnl work around that we don't have Objective-C support in autoconf
 CFLAGS="-x objective-c -fgnu-runtime -fobjc-exceptions -S"
 if AC_TRY_EVAL(ac_compile); then
   if grep _Unwind_SjLj_Resume conftest.s >/dev/null 2>&1 ; then
     enable_sjlj_exceptions=yes
   elif grep _Unwind_Resume conftest.s >/dev/null 2>&1 ; then
     enable_sjlj_exceptions=no
   fi
 fi
 CFLAGS="$old_CFLAGS"
 rm -f conftest*])
 if test x$enable_sjlj_exceptions = xyes; then
   AC_DEFINE(SJLJ_EXCEPTIONS, 1,
 	[Define if the compiler is configured for setjmp/longjmp exceptions.])
   ac_exception_model_name=sjlj
 elif test x$enable_sjlj_exceptions = xno; then
   ac_exception_model_name="call frame"
 else
   AC_MSG_ERROR([unable to detect exception model])
 fi
 AC_LANG_POP(C)
 AC_MSG_RESULT($ac_exception_model_name)

 # ------
 # Output
 # ------

 if test ${multilib} = yes; then
   multilib_arg="--enable-multilib"
 else
   multilib_arg=
 fi

 AC_CONFIG_FILES([Makefile])
 AC_OUTPUT
	# Process this file with autoconf to produce a configure script.
	# Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2003, 2004
	# 2005, 2006, 2009 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 3, 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 COPYING3. If not see
	#<http://www.gnu.org/licenses/>.

	AC_PREREQ(2.64)
	AC_INIT(package-unused, version-unused,, libobjc)
	AC_CONFIG_SRCDIR([objc/objc.h])
	GCC_TOPLEV_SUBDIRS

	# We need the following definitions because AC_PROG_LIBTOOL relies on them
	PACKAGE=libobjc
	# Version is pulled out to make it a bit easier to change using sed.
	VERSION=3:0:0
	AC_SUBST(VERSION)

	# 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

	# -------
	# Options
	# -------

	# 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])

	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 "$enableval" in
	yes) version_specific_libs=yes ;;
	no) version_specific_libs=no ;;
	*) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
	esac],
	[version_specific_libs=no])
	AC_MSG_RESULT($version_specific_libs)

	AC_ARG_ENABLE(objc-gc,
	[ --enable-objc-gc enable the use of Boehm's garbage collector with
	the GNU Objective-C runtime.],
	[case $enable_objc_gc in
	no)
	OBJC_BOEHM_GC=''
	OBJC_BOEHM_GC_INCLUDES=''
	;;
	*)
	OBJC_BOEHM_GC=libobjc_gc.la
	OBJC_BOEHM_GC_INCLUDES='-I$(top_srcdir)/../boehm-gc/include -I../boehm-gc/include'
	;;
	esac],
	[OBJC_BOEHM_GC=''; OBJC_BOEHM_GC_INCLUDES=''])
	AC_SUBST(OBJC_BOEHM_GC)
	AC_SUBST(OBJC_BOEHM_GC_INCLUDES)

	# -----------
	# Directories
	# -----------

	# Find the rest of the source tree framework.
	AM_ENABLE_MULTILIB(, ..)

	AC_CANONICAL_SYSTEM
	ACX_NONCANONICAL_TARGET

	# Export source directory.
	# 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.
	case $srcdir in
	[\\/$]* \| ?:[\\/]*) glibcpp_srcdir=${srcdir} ;;
	*) glibcpp_srcdir=`cd "$srcdir" && ${PWDCMD-pwd} \|\| echo "$srcdir"` ;;
	esac
	AC_SUBST(glibcpp_srcdir)

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

	# Figure out if we want to name the include directory and the
	# library name changes differently.
	includedirname=include
	libsuffix=
	case "${host}" in
	-darwin)
	# Darwin is the only target so far that needs a different include directory.
	includedirname=include-gnu-runtime
	libsuffix=-gnu
	;;
	esac
	AC_SUBST(includedirname)
	AC_SUBST(libsuffix)

	AC_CONFIG_HEADERS(config.h)

	# --------
	# Programs
	# --------

	GCC_NO_EXECUTABLES

	# We must force CC to /not/ be a precious variable; otherwise
	# the wrong, non-multilib-adjusted value will be used in multilibs.
	# As a side effect, we have to subst CFLAGS ourselves.
	m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
	m4_define([_AC_ARG_VAR_PRECIOUS],[])
	AC_PROG_CC
	m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])

	# extra LD Flags which are required for targets
	ACX_LT_HOST_FLAGS
	case "${host}" in
	-darwin)
	# Darwin needs -single_module when linking libobjc
	extra_ldflags_libobjc='$(lt_host_flags) -Wl,-single_module'
	;;
	-cygwin\|-mingw)
	# Tell libtool to build DLLs on Windows
	extra_ldflags_libobjc='$(lt_host_flags)'
	;;
	esac
	AC_SUBST(extra_ldflags_libobjc)

	AC_SUBST(CFLAGS)

	AC_CHECK_TOOL(AS, as)
	AC_CHECK_TOOL(AR, ar)
	AC_CHECK_TOOL(RANLIB, ranlib, :)
	AC_PROG_INSTALL

	AM_MAINTAINER_MODE

	# Enable Win32 DLL on MS Windows - FIXME
	AC_LIBTOOL_WIN32_DLL

	AC_PROG_LIBTOOL

	AM_PROG_CC_C_O

	AC_PROG_MAKE_SET

	# -------
	# Headers
	# -------

	# 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)

	# -----------
	# Miscellanea
	# -----------

	AC_MSG_CHECKING([for thread model used by GCC])
	target_thread_file=`$CC -v 2>&1 \| sed -n 's/^Thread model: //p'`
	AC_MSG_RESULT([$target_thread_file])

	if test $target_thread_file != single; then
	AC_DEFINE(HAVE_GTHR_DEFAULT, 1,
	[Define if the compiler has a thread header that is non single.])
	fi

	# Check if we have thread-local storage
	GCC_CHECK_TLS

	AC_MSG_CHECKING([for exception model to use])
	AC_LANG_PUSH(C)
	AC_ARG_ENABLE(sjlj-exceptions,
	AS_HELP_STRING([--enable-sjlj-exceptions],
	[force use of builtin_setjmp for exceptions]),
	[:],
	[dnl Botheration. Now we've got to detect the exception model.
	dnl Link tests against libgcc.a are problematic since -- at least
	dnl as of this writing -- we've not been given proper -L bits for
	dnl single-tree newlib and libgloss.
	dnl
	dnl This is what AC_TRY_COMPILE would do if it didn't delete the
	dnl conftest files before we got a change to grep them first.
	cat > conftest.$ac_ext << EOF
	[#]line __oline__ "configure"
	@interface Frob
	@end
	@implementation Frob
	@end
	int proc();
	int foo()
	{
	@try {
	return proc();
	}
	@catch (Frob* ex) {
	return 0;
	}
	}
	EOF
	old_CFLAGS="$CFLAGS"
	dnl work around that we don't have Objective-C support in autoconf
	CFLAGS="-x objective-c -fgnu-runtime -fobjc-exceptions -S"
	if AC_TRY_EVAL(ac_compile); then
	if grep _Unwind_SjLj_Resume conftest.s >/dev/null 2>&1 ; then
	enable_sjlj_exceptions=yes
	elif grep _Unwind_Resume conftest.s >/dev/null 2>&1 ; then
	enable_sjlj_exceptions=no
	fi
	fi
	CFLAGS="$old_CFLAGS"
	rm -f conftest*])
	if test x$enable_sjlj_exceptions = xyes; then
	AC_DEFINE(SJLJ_EXCEPTIONS, 1,
	[Define if the compiler is configured for setjmp/longjmp exceptions.])
	ac_exception_model_name=sjlj
	elif test x$enable_sjlj_exceptions = xno; then
	ac_exception_model_name="call frame"
	else
	AC_MSG_ERROR([unable to detect exception model])
	fi
	AC_LANG_POP(C)
	AC_MSG_RESULT($ac_exception_model_name)

	# ------
	# Output
	# ------

	if test ${multilib} = yes; then
	multilib_arg="--enable-multilib"
	else
	multilib_arg=
	fi

	AC_CONFIG_FILES([Makefile])
	AC_OUTPUT