libstdc++-v3/configure.ac - gcc - Git at Google

 # Process this file with autoreconf to produce a configure script.

 AC_PREREQ(2.59)
 AC_INIT(package-unused, version-unused,, libstdc++)
 AC_CONFIG_SRCDIR(src/ios.cc)
 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.  Only used at the end of this file.
 ### am handles this now?  ORIGINAL_LD_FOR_MULTILIBS=$LD

 # For libtool versioning info, format is CURRENT:REVISION:AGE
 libtool_VERSION=6:13:0
 AC_SUBST(libtool_VERSION)

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

 # Gets build, host, target, *_vendor, *_cpu, *_os, etc.
 #
 # You will slowly go insane if you do not grok the following fact:  when
 # building v3 as part of the compiler, the top-level /target/ becomes the
 # library's /host/.  configure then causes --target to default to --host,
 # exactly like any other package using autoconf.  Therefore, 'target' and
 # 'host' will always be the same.  This makes sense both for native and
 # cross compilers, just think about it for a little while.  :-)
 #
 # Also, if v3 is being configured as part of a cross compiler, the top-level
 # configure script will pass the "real" host as $with_cross_host.
 #
 # Do not delete or change the following two lines.  For why, see
 # http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html
 AC_CANONICAL_SYSTEM
 target_alias=${target_alias-$host_alias}

 # Handy for debugging:
 #AC_MSG_NOTICE($build / $host / $target / $host_alias / $target_alias); sleep 5

 if test "$build" != "$host"; then
   # We are being configured with some form of cross compiler.
   GLIBCXX_IS_NATIVE=false
   case "$host","$target" in
     # Darwin crosses can use the host system's libraries and headers,
     # because of the fat library support.  Of course, it must be the
     # same version of Darwin on both sides.  Allow the user to
     # just say --target=foo-darwin without a version number to mean
     # "the version on this system".
       *-*-darwin*,*-*-darwin*)
 	hostos=`echo $host | sed 's/.*-darwin/darwin/'`
 	targetos=`echo $target | sed 's/.*-darwin/darwin/'`
 	if test $hostos = $targetos -o $targetos = darwin ; then
 	  GLIBCXX_IS_NATIVE=true
 	fi
 	;;

       *)
 	GCC_NO_EXECUTABLES
 	;;
   esac
 else
   GLIBCXX_IS_NATIVE=true
 fi

 # Sets up automake.  Must come after AC_CANONICAL_SYSTEM.  Each of the
 # following is magically included in AUTOMAKE_OPTIONS in each Makefile.am.
 #  1.x:  minimum required version
 #  no-define:  PACKAGE and VERSION will not be #define'd in config.h (a bunch
 #              of other PACKAGE_* variables will, however, and there's nothing
 #              we can do about that; they come from AC_INIT).
 #  foreign:  we don't follow the normal rules for GNU packages (no COPYING
 #            file in the top srcdir, etc, etc), so stop complaining.
 #  no-dependencies:  turns off auto dependency generation (just for now)
 #  -Wall:  turns on all automake warnings...
 #  -Wno-portability:  ...except this one, since GNU make is now required.
 AM_INIT_AUTOMAKE([1.9.3 no-define foreign no-dependencies -Wall -Wno-portability -Wno-override])
 AH_TEMPLATE(PACKAGE, [Name of package])
 AH_TEMPLATE(VERSION, [Version number of package])

 # Runs configure.host, finds CC, CXX, and assorted other critical bits.  Sets
 # up critical shell variables.
 GLIBCXX_CONFIGURE

 if test "x${with_newlib}" != "xyes"; then
   AC_LIBTOOL_DLOPEN
 fi
 AM_PROG_LIBTOOL
 AC_SUBST(enable_shared)
 AC_SUBST(enable_static)

 # Possibly disable most of the library.
 ## TODO: Consider skipping unncessary tests altogether in this case, rather
 ## than just ignoring the results.  Faster /and/ more correct, win win.
 GLIBCXX_ENABLE_HOSTED

 # Enable compiler support that doesn't require linking.
 GLIBCXX_ENABLE_SJLJ_EXCEPTIONS
 GLIBCXX_ENABLE_PCH($is_hosted)
 GLIBCXX_ENABLE_THREADS
 GLIBCXX_ENABLE_ATOMIC_BUILTINS

 # Checks for compiler support that doesn't require linking.
 GLIBCXX_CHECK_COMPILER_FEATURES

 # Enable all the variable C++ runtime options that don't require linking.
 GLIBCXX_ENABLE_CSTDIO
 GLIBCXX_ENABLE_CLOCALE
 GLIBCXX_ENABLE_ALLOCATOR
 GLIBCXX_ENABLE_CHEADERS($c_model)  dnl c_model from configure.host
 GLIBCXX_ENABLE_LONG_LONG([yes])
 GLIBCXX_ENABLE_WCHAR_T([yes])
 GLIBCXX_ENABLE_C99([yes])
 GLIBCXX_ENABLE_CONCEPT_CHECKS([no])
 GLIBCXX_ENABLE_DEBUG_FLAGS(["-g3 -O0"])
 GLIBCXX_ENABLE_DEBUG([no])
 GLIBCXX_ENABLE_PARALLEL([yes])
 GLIBCXX_ENABLE_CXX_FLAGS
 GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING([no])

 # Checks for operating systems support that doesn't require linking.
 GLIBCXX_CHECK_SYSTEM_ERROR

 # For the streamoff typedef.
 GLIBCXX_CHECK_INT64_T

 # For LFS support.
 GLIBCXX_CHECK_LFS

 # For showmanyc_helper().
 AC_CHECK_HEADERS(sys/ioctl.h sys/filio.h)
 GLIBCXX_CHECK_POLL
 GLIBCXX_CHECK_S_ISREG_OR_S_IFREG

 # For xsputn_2().
 AC_CHECK_HEADERS(sys/uio.h)
 GLIBCXX_CHECK_WRITEV

 # For C99 support to TR1.
 GLIBCXX_CHECK_C99_TR1

 # For common values of EOF, SEEK_CUR, SEEK_END.
 GLIBCXX_CHECK_STDIO_MACROS

 # For gettimeofday support.
 GLIBCXX_CHECK_GETTIMEOFDAY

 # For clock_gettime, nanosleep and sched_yield support.
 # NB: The default is [no], because otherwise it requires linking.
 GLIBCXX_ENABLE_LIBSTDCXX_TIME([no])

 # For gthread support
 GLIBCXX_CHECK_GTHREADS

 AC_LC_MESSAGES

 # Check for available headers.
 AC_CHECK_HEADERS([endian.h float.h fp.h ieeefp.h inttypes.h locale.h \
 machine/endian.h machine/param.h nan.h stdint.h stdlib.h string.h \
 strings.h sys/ipc.h sys/isa_defs.h sys/machine.h sys/param.h \
 sys/resource.h sys/sem.h sys/stat.h sys/time.h sys/types.h unistd.h \
 wchar.h wctype.h])

 # Only do link tests if native. Else, hardcode.
 if $GLIBCXX_IS_NATIVE; then

   # We can do more elaborate tests that assume a working linker.
   CANADIAN=no

   GLIBCXX_CHECK_LINKER_FEATURES
   GLIBCXX_CHECK_MATH_SUPPORT
   GLIBCXX_CHECK_STDLIB_SUPPORT

   # For /dev/random and /dev/urandom for TR1.
   GLIBCXX_CHECK_RANDOM_TR1

   # For TLS support.
   GCC_CHECK_TLS

   # For iconv support.
   AM_ICONV

 else

   # This lets us hard-code the functionality we know we'll have in the cross
   # target environment.  "Let" is a sugar-coated word placed on an especially
   # dull and tedious hack, actually.
   #
   # Here's why GLIBCXX_CHECK_MATH_SUPPORT, and other autoconf macros
   # that involve linking, can't be used:
   #    "cannot open sim-crt0.o"
   #    "cannot open crt0.o"
   # etc.  All this is because there currently exists no unified, consistent
   # way for top level CC information to be passed down to target directories:
   # newlib includes, newlib linking info, libgloss versus newlib crt0.o, etc.
   # When all of that is done, all of this hokey, excessive AC_DEFINE junk for
   # crosses can be removed.

   # If Canadian cross, then don't pick up tools from the build directory.
   # Used only in GLIBCXX_EXPORT_INCLUDES.
   if test -n "$with_cross_host" &&
      test x"$build_alias" != x"$with_cross_host" &&
      test x"$build" != x"$target";
   then
     CANADIAN=yes
   else
     CANADIAN=no
   fi

   # Construct crosses by hand, eliminating bits that need ld...
   # GLIBCXX_CHECK_MATH_SUPPORT

   # First, test for "known" system libraries.  We may be using newlib even
   # on a hosted environment.
   if test "x${with_newlib}" = "xyes"; then
     os_include_dir="os/newlib"
     AC_DEFINE(HAVE_HYPOT)

     # GLIBCXX_CHECK_STDLIB_SUPPORT
     AC_DEFINE(HAVE_STRTOF)

     AC_DEFINE(HAVE_ACOSF)
     AC_DEFINE(HAVE_ASINF)
     AC_DEFINE(HAVE_ATAN2F)
     AC_DEFINE(HAVE_ATANF)
     AC_DEFINE(HAVE_CEILF)
     AC_DEFINE(HAVE_COSF)
     AC_DEFINE(HAVE_COSHF)
     AC_DEFINE(HAVE_EXPF)
     AC_DEFINE(HAVE_FABSF)
     AC_DEFINE(HAVE_FLOORF)
     AC_DEFINE(HAVE_FMODF)
     AC_DEFINE(HAVE_FREXPF)
     AC_DEFINE(HAVE_LDEXPF)
     AC_DEFINE(HAVE_LOG10F)
     AC_DEFINE(HAVE_LOGF)
     AC_DEFINE(HAVE_MODFF)
     AC_DEFINE(HAVE_POWF)
     AC_DEFINE(HAVE_SINF)
     AC_DEFINE(HAVE_SINHF)
     AC_DEFINE(HAVE_SQRTF)
     AC_DEFINE(HAVE_TANF)
     AC_DEFINE(HAVE_TANHF)

     AC_DEFINE(HAVE_ICONV)
   else
     GLIBCXX_CROSSCONFIG
   fi

   # At some point, we should differentiate between architectures
   # like x86, which have long double versions, and alpha/powerpc/etc.,
   # which don't. For the time being, punt.
   if test x"long_double_math_on_this_cpu" = x"yes"; then
     AC_DEFINE(HAVE_ACOSL)
     AC_DEFINE(HAVE_ASINL)
     AC_DEFINE(HAVE_ATAN2L)
     AC_DEFINE(HAVE_ATANL)
     AC_DEFINE(HAVE_CEILL)
     AC_DEFINE(HAVE_COSL)
     AC_DEFINE(HAVE_COSHL)
     AC_DEFINE(HAVE_EXPL)
     AC_DEFINE(HAVE_FABSL)
     AC_DEFINE(HAVE_FLOORL)
     AC_DEFINE(HAVE_FMODL)
     AC_DEFINE(HAVE_FREXPL)
     AC_DEFINE(HAVE_LDEXPL)
     AC_DEFINE(HAVE_LOG10L)
     AC_DEFINE(HAVE_LOGL)
     AC_DEFINE(HAVE_MODFL)
     AC_DEFINE(HAVE_POWL)
     AC_DEFINE(HAVE_SINCOSL)
     AC_DEFINE(HAVE_SINL)
     AC_DEFINE(HAVE_SINHL)
     AC_DEFINE(HAVE_SQRTL)
     AC_DEFINE(HAVE_TANL)
     AC_DEFINE(HAVE_TANHL)
   fi
 fi

 # Check for _Unwind_GetIPInfo.
 GCC_CHECK_UNWIND_GETIPINFO


 GCC_LINUX_FUTEX([AC_DEFINE(HAVE_LINUX_FUTEX, 1, [Define if futex syscall is available.])])

 GCC_HEADER_STDINT(include/gstdint.h)

 # This depends on GLIBCXX CHECK_LINKER_FEATURES, but without it assumes no.
 GLIBCXX_ENABLE_SYMVERS([yes])
 GLIBCXX_ENABLE_VISIBILITY([yes])

 ac_ldbl_compat=no
 case "$target" in
   powerpc*-*-linux* | \
   powerpc*-*-gnu* | \
   sparc*-*-linux* | \
   s390*-*-linux* | \
   alpha*-*-linux*)
   AC_TRY_COMPILE(, [
 #if !defined __LONG_DOUBLE_128__ || (defined(__sparc__) && defined(__arch64__))
 #error no need for long double compatibility
 #endif
   ], [ac_ldbl_compat=yes], [ac_ldbl_compat=no])
   if test "$ac_ldbl_compat" = yes; then
     AC_DEFINE([_GLIBCXX_LONG_DOUBLE_COMPAT],1,
 	      [Define if compatibility should be provided for -mlong-double-64.])
     port_specific_symbol_files="\$(top_srcdir)/config/os/gnu-linux/ldbl-extra.ver"
   fi
 esac
 GLIBCXX_CONDITIONAL(GLIBCXX_LDBL_COMPAT, test $ac_ldbl_compat = yes)

 # This depends on GLIBCXX_ENABLE_SYMVERS and GLIBCXX_IS_NATIVE.
 GLIBCXX_CONFIGURE_TESTSUITE

 # Propagate the target-specific source directories through the build chain.
 ATOMICITY_SRCDIR=config/${atomicity_dir}
 ATOMIC_WORD_SRCDIR=config/${atomic_word_dir}
 ATOMIC_FLAGS=${atomic_flags}
 CPU_DEFINES_SRCDIR=config/${cpu_defines_dir}
 OS_INC_SRCDIR=config/${os_include_dir}
 ERROR_CONSTANTS_SRCDIR=config/${error_constants_dir}
 ABI_TWEAKS_SRCDIR=config/${abi_tweaks_dir}
 AC_SUBST(ATOMICITY_SRCDIR)
 AC_SUBST(ATOMIC_WORD_SRCDIR)
 AC_SUBST(ATOMIC_FLAGS)
 AC_SUBST(CPU_DEFINES_SRCDIR)
 AC_SUBST(ABI_TWEAKS_SRCDIR)
 AC_SUBST(OS_INC_SRCDIR)
 AC_SUBST(ERROR_CONSTANTS_SRCDIR)


 # Determine cross-compile flags and AM_CONDITIONALs.
 #AC_SUBST(GLIBCXX_IS_NATIVE)
 #AM_CONDITIONAL(CANADIAN, test $CANADIAN = yes)
 GLIBCXX_EVALUATE_CONDITIONALS

 AC_CACHE_SAVE

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

 # Export all the install information.
 GLIBCXX_EXPORT_INSTALL_INFO

 # Export all the include and flag information to Makefiles.
 GLIBCXX_EXPORT_INCLUDES
 GLIBCXX_EXPORT_FLAGS

 if test "$enable_shared" = yes; then
   LIBSUPCXX_PICFLAGS="-prefer-pic"
 else
   LIBSUPCXX_PICFLAGS=
 fi
 AC_SUBST(LIBSUPCXX_PICFLAGS)

 dnl In autoconf 2.5x, AC_OUTPUT is replaced by four AC_CONFIG_* macros,
 dnl which can all be called multiple times as needed, plus one (different)
 dnl AC_OUTPUT macro.  This one lists the files to be created:
 AC_CONFIG_FILES( \
   Makefile \
   AC_FOREACH([DIR], glibcxx_SUBDIRS, [DIR/Makefile ])
   )
 AC_CONFIG_FILES([scripts/testsuite_flags],[chmod +x scripts/testsuite_flags])

 dnl These commands are run at the end of config.status:
 AC_CONFIG_COMMANDS([default],
 [if test -n "$CONFIG_FILES"; then
    # Multilibs need MULTISUBDIR defined correctly in certain makefiles so
    # that multilib installs will end up installed in the correct place.
    # The testsuite needs it for multilib-aware ABI baseline files.
    # To work around this not being passed down from config-ml.in ->
    # srcdir/Makefile.am -> srcdir/{src,libsupc++,...}/Makefile.am, manually
    # append it here.  Only modify Makefiles that have just been created.
    #
    # Also, get rid of this simulated-VPATH thing that automake does.
    cat > vpsed << \_EOF
 s!`test -f '$<' || echo '$(srcdir)/'`!!
 _EOF
    for i in $SUBDIRS; do
     case $CONFIG_FILES in
      *${i}/Makefile*)
        #echo "Adding MULTISUBDIR to $i/Makefile"
        sed -f vpsed $i/Makefile > tmp
        grep '^MULTISUBDIR =' Makefile >> tmp
        mv tmp $i/Makefile
        ;;
     esac
    done
    rm vpsed
  fi
  (cd include && ${MAKE-make})
 ],
 [
 # Variables needed in config.status (file generation) which aren't already
 # passed by autoconf.
 SUBDIRS="$SUBDIRS"
 ])

 dnl And this actually makes things happen:
 AC_OUTPUT
	# Process this file with autoreconf to produce a configure script.

	AC_PREREQ(2.59)
	AC_INIT(package-unused, version-unused,, libstdc++)
	AC_CONFIG_SRCDIR(src/ios.cc)
	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. Only used at the end of this file.
	### am handles this now? ORIGINAL_LD_FOR_MULTILIBS=$LD

	# For libtool versioning info, format is CURRENT:REVISION:AGE
	libtool_VERSION=6:13:0
	AC_SUBST(libtool_VERSION)

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

	# Gets build, host, target, _vendor, _cpu, *_os, etc.
	#
	# You will slowly go insane if you do not grok the following fact: when
	# building v3 as part of the compiler, the top-level /target/ becomes the
	# library's /host/. configure then causes --target to default to --host,
	# exactly like any other package using autoconf. Therefore, 'target' and
	# 'host' will always be the same. This makes sense both for native and
	# cross compilers, just think about it for a little while. :-)
	#
	# Also, if v3 is being configured as part of a cross compiler, the top-level
	# configure script will pass the "real" host as $with_cross_host.
	#
	# Do not delete or change the following two lines. For why, see
	# http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html
	AC_CANONICAL_SYSTEM
	target_alias=${target_alias-$host_alias}

	# Handy for debugging:
	#AC_MSG_NOTICE($build / $host / $target / $host_alias / $target_alias); sleep 5

	if test "$build" != "$host"; then
	# We are being configured with some form of cross compiler.
	GLIBCXX_IS_NATIVE=false
	case "$host","$target" in
	# Darwin crosses can use the host system's libraries and headers,
	# because of the fat library support. Of course, it must be the
	# same version of Darwin on both sides. Allow the user to
	# just say --target=foo-darwin without a version number to mean
	# "the version on this system".
	--darwin,--darwin)
	hostos=`echo $host \| sed 's/.*-darwin/darwin/'`
	targetos=`echo $target \| sed 's/.*-darwin/darwin/'`
	if test $hostos = $targetos -o $targetos = darwin ; then
	GLIBCXX_IS_NATIVE=true
	fi
	;;

	*)
	GCC_NO_EXECUTABLES
	;;
	esac
	else
	GLIBCXX_IS_NATIVE=true
	fi

	# Sets up automake. Must come after AC_CANONICAL_SYSTEM. Each of the
	# following is magically included in AUTOMAKE_OPTIONS in each Makefile.am.
	# 1.x: minimum required version
	# no-define: PACKAGE and VERSION will not be #define'd in config.h (a bunch
	# of other PACKAGE_* variables will, however, and there's nothing
	# we can do about that; they come from AC_INIT).
	# foreign: we don't follow the normal rules for GNU packages (no COPYING
	# file in the top srcdir, etc, etc), so stop complaining.
	# no-dependencies: turns off auto dependency generation (just for now)
	# -Wall: turns on all automake warnings...
	# -Wno-portability: ...except this one, since GNU make is now required.
	AM_INIT_AUTOMAKE([1.9.3 no-define foreign no-dependencies -Wall -Wno-portability -Wno-override])
	AH_TEMPLATE(PACKAGE, [Name of package])
	AH_TEMPLATE(VERSION, [Version number of package])

	# Runs configure.host, finds CC, CXX, and assorted other critical bits. Sets
	# up critical shell variables.
	GLIBCXX_CONFIGURE

	if test "x${with_newlib}" != "xyes"; then
	AC_LIBTOOL_DLOPEN
	fi
	AM_PROG_LIBTOOL
	AC_SUBST(enable_shared)
	AC_SUBST(enable_static)

	# Possibly disable most of the library.
	## TODO: Consider skipping unncessary tests altogether in this case, rather
	## than just ignoring the results. Faster /and/ more correct, win win.
	GLIBCXX_ENABLE_HOSTED

	# Enable compiler support that doesn't require linking.
	GLIBCXX_ENABLE_SJLJ_EXCEPTIONS
	GLIBCXX_ENABLE_PCH($is_hosted)
	GLIBCXX_ENABLE_THREADS
	GLIBCXX_ENABLE_ATOMIC_BUILTINS

	# Checks for compiler support that doesn't require linking.
	GLIBCXX_CHECK_COMPILER_FEATURES

	# Enable all the variable C++ runtime options that don't require linking.
	GLIBCXX_ENABLE_CSTDIO
	GLIBCXX_ENABLE_CLOCALE
	GLIBCXX_ENABLE_ALLOCATOR
	GLIBCXX_ENABLE_CHEADERS($c_model) dnl c_model from configure.host
	GLIBCXX_ENABLE_LONG_LONG([yes])
	GLIBCXX_ENABLE_WCHAR_T([yes])
	GLIBCXX_ENABLE_C99([yes])
	GLIBCXX_ENABLE_CONCEPT_CHECKS([no])
	GLIBCXX_ENABLE_DEBUG_FLAGS(["-g3 -O0"])
	GLIBCXX_ENABLE_DEBUG([no])
	GLIBCXX_ENABLE_PARALLEL([yes])
	GLIBCXX_ENABLE_CXX_FLAGS
	GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING([no])

	# Checks for operating systems support that doesn't require linking.
	GLIBCXX_CHECK_SYSTEM_ERROR

	# For the streamoff typedef.
	GLIBCXX_CHECK_INT64_T

	# For LFS support.
	GLIBCXX_CHECK_LFS

	# For showmanyc_helper().
	AC_CHECK_HEADERS(sys/ioctl.h sys/filio.h)
	GLIBCXX_CHECK_POLL
	GLIBCXX_CHECK_S_ISREG_OR_S_IFREG

	# For xsputn_2().
	AC_CHECK_HEADERS(sys/uio.h)
	GLIBCXX_CHECK_WRITEV

	# For C99 support to TR1.
	GLIBCXX_CHECK_C99_TR1

	# For common values of EOF, SEEK_CUR, SEEK_END.
	GLIBCXX_CHECK_STDIO_MACROS

	# For gettimeofday support.
	GLIBCXX_CHECK_GETTIMEOFDAY

	# For clock_gettime, nanosleep and sched_yield support.
	# NB: The default is [no], because otherwise it requires linking.
	GLIBCXX_ENABLE_LIBSTDCXX_TIME([no])

	# For gthread support
	GLIBCXX_CHECK_GTHREADS

	AC_LC_MESSAGES

	# Check for available headers.
	AC_CHECK_HEADERS([endian.h float.h fp.h ieeefp.h inttypes.h locale.h \
	machine/endian.h machine/param.h nan.h stdint.h stdlib.h string.h \
	strings.h sys/ipc.h sys/isa_defs.h sys/machine.h sys/param.h \
	sys/resource.h sys/sem.h sys/stat.h sys/time.h sys/types.h unistd.h \
	wchar.h wctype.h])

	# Only do link tests if native. Else, hardcode.
	if $GLIBCXX_IS_NATIVE; then

	# We can do more elaborate tests that assume a working linker.
	CANADIAN=no

	GLIBCXX_CHECK_LINKER_FEATURES
	GLIBCXX_CHECK_MATH_SUPPORT
	GLIBCXX_CHECK_STDLIB_SUPPORT

	# For /dev/random and /dev/urandom for TR1.
	GLIBCXX_CHECK_RANDOM_TR1

	# For TLS support.
	GCC_CHECK_TLS

	# For iconv support.
	AM_ICONV

	else

	# This lets us hard-code the functionality we know we'll have in the cross
	# target environment. "Let" is a sugar-coated word placed on an especially
	# dull and tedious hack, actually.
	#
	# Here's why GLIBCXX_CHECK_MATH_SUPPORT, and other autoconf macros
	# that involve linking, can't be used:
	# "cannot open sim-crt0.o"
	# "cannot open crt0.o"
	# etc. All this is because there currently exists no unified, consistent
	# way for top level CC information to be passed down to target directories:
	# newlib includes, newlib linking info, libgloss versus newlib crt0.o, etc.
	# When all of that is done, all of this hokey, excessive AC_DEFINE junk for
	# crosses can be removed.

	# If Canadian cross, then don't pick up tools from the build directory.
	# Used only in GLIBCXX_EXPORT_INCLUDES.
	if test -n "$with_cross_host" &&
	test x"$build_alias" != x"$with_cross_host" &&
	test x"$build" != x"$target";
	then
	CANADIAN=yes
	else
	CANADIAN=no
	fi

	# Construct crosses by hand, eliminating bits that need ld...
	# GLIBCXX_CHECK_MATH_SUPPORT

	# First, test for "known" system libraries. We may be using newlib even
	# on a hosted environment.
	if test "x${with_newlib}" = "xyes"; then
	os_include_dir="os/newlib"
	AC_DEFINE(HAVE_HYPOT)

	# GLIBCXX_CHECK_STDLIB_SUPPORT
	AC_DEFINE(HAVE_STRTOF)

	AC_DEFINE(HAVE_ACOSF)
	AC_DEFINE(HAVE_ASINF)
	AC_DEFINE(HAVE_ATAN2F)
	AC_DEFINE(HAVE_ATANF)
	AC_DEFINE(HAVE_CEILF)
	AC_DEFINE(HAVE_COSF)
	AC_DEFINE(HAVE_COSHF)
	AC_DEFINE(HAVE_EXPF)
	AC_DEFINE(HAVE_FABSF)
	AC_DEFINE(HAVE_FLOORF)
	AC_DEFINE(HAVE_FMODF)
	AC_DEFINE(HAVE_FREXPF)
	AC_DEFINE(HAVE_LDEXPF)
	AC_DEFINE(HAVE_LOG10F)
	AC_DEFINE(HAVE_LOGF)
	AC_DEFINE(HAVE_MODFF)
	AC_DEFINE(HAVE_POWF)
	AC_DEFINE(HAVE_SINF)
	AC_DEFINE(HAVE_SINHF)
	AC_DEFINE(HAVE_SQRTF)
	AC_DEFINE(HAVE_TANF)
	AC_DEFINE(HAVE_TANHF)

	AC_DEFINE(HAVE_ICONV)
	else
	GLIBCXX_CROSSCONFIG
	fi

	# At some point, we should differentiate between architectures
	# like x86, which have long double versions, and alpha/powerpc/etc.,
	# which don't. For the time being, punt.
	if test x"long_double_math_on_this_cpu" = x"yes"; then
	AC_DEFINE(HAVE_ACOSL)
	AC_DEFINE(HAVE_ASINL)
	AC_DEFINE(HAVE_ATAN2L)
	AC_DEFINE(HAVE_ATANL)
	AC_DEFINE(HAVE_CEILL)
	AC_DEFINE(HAVE_COSL)
	AC_DEFINE(HAVE_COSHL)
	AC_DEFINE(HAVE_EXPL)
	AC_DEFINE(HAVE_FABSL)
	AC_DEFINE(HAVE_FLOORL)
	AC_DEFINE(HAVE_FMODL)
	AC_DEFINE(HAVE_FREXPL)
	AC_DEFINE(HAVE_LDEXPL)
	AC_DEFINE(HAVE_LOG10L)
	AC_DEFINE(HAVE_LOGL)
	AC_DEFINE(HAVE_MODFL)
	AC_DEFINE(HAVE_POWL)
	AC_DEFINE(HAVE_SINCOSL)
	AC_DEFINE(HAVE_SINL)
	AC_DEFINE(HAVE_SINHL)
	AC_DEFINE(HAVE_SQRTL)
	AC_DEFINE(HAVE_TANL)
	AC_DEFINE(HAVE_TANHL)
	fi
	fi

	# Check for _Unwind_GetIPInfo.
	GCC_CHECK_UNWIND_GETIPINFO


	GCC_LINUX_FUTEX([AC_DEFINE(HAVE_LINUX_FUTEX, 1, [Define if futex syscall is available.])])

	GCC_HEADER_STDINT(include/gstdint.h)

	# This depends on GLIBCXX CHECK_LINKER_FEATURES, but without it assumes no.
	GLIBCXX_ENABLE_SYMVERS([yes])
	GLIBCXX_ENABLE_VISIBILITY([yes])

	ac_ldbl_compat=no
	case "$target" in
	powerpc--linux* \| \
	powerpc--gnu* \| \
	sparc--linux* \| \
	s390--linux* \| \
	alpha--linux*)
	AC_TRY_COMPILE(, [
	#if !defined __LONG_DOUBLE_128__ \|\| (defined(__sparc__) && defined(__arch64__))
	#error no need for long double compatibility
	#endif
	], [ac_ldbl_compat=yes], [ac_ldbl_compat=no])
	if test "$ac_ldbl_compat" = yes; then
	AC_DEFINE([_GLIBCXX_LONG_DOUBLE_COMPAT],1,
	[Define if compatibility should be provided for -mlong-double-64.])
	port_specific_symbol_files="\$(top_srcdir)/config/os/gnu-linux/ldbl-extra.ver"
	fi
	esac
	GLIBCXX_CONDITIONAL(GLIBCXX_LDBL_COMPAT, test $ac_ldbl_compat = yes)

	# This depends on GLIBCXX_ENABLE_SYMVERS and GLIBCXX_IS_NATIVE.
	GLIBCXX_CONFIGURE_TESTSUITE

	# Propagate the target-specific source directories through the build chain.
	ATOMICITY_SRCDIR=config/${atomicity_dir}
	ATOMIC_WORD_SRCDIR=config/${atomic_word_dir}
	ATOMIC_FLAGS=${atomic_flags}
	CPU_DEFINES_SRCDIR=config/${cpu_defines_dir}
	OS_INC_SRCDIR=config/${os_include_dir}
	ERROR_CONSTANTS_SRCDIR=config/${error_constants_dir}
	ABI_TWEAKS_SRCDIR=config/${abi_tweaks_dir}
	AC_SUBST(ATOMICITY_SRCDIR)
	AC_SUBST(ATOMIC_WORD_SRCDIR)
	AC_SUBST(ATOMIC_FLAGS)
	AC_SUBST(CPU_DEFINES_SRCDIR)
	AC_SUBST(ABI_TWEAKS_SRCDIR)
	AC_SUBST(OS_INC_SRCDIR)
	AC_SUBST(ERROR_CONSTANTS_SRCDIR)


	# Determine cross-compile flags and AM_CONDITIONALs.
	#AC_SUBST(GLIBCXX_IS_NATIVE)
	#AM_CONDITIONAL(CANADIAN, test $CANADIAN = yes)
	GLIBCXX_EVALUATE_CONDITIONALS

	AC_CACHE_SAVE

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

	# Export all the install information.
	GLIBCXX_EXPORT_INSTALL_INFO

	# Export all the include and flag information to Makefiles.
	GLIBCXX_EXPORT_INCLUDES
	GLIBCXX_EXPORT_FLAGS

	if test "$enable_shared" = yes; then
	LIBSUPCXX_PICFLAGS="-prefer-pic"
	else
	LIBSUPCXX_PICFLAGS=
	fi
	AC_SUBST(LIBSUPCXX_PICFLAGS)

	dnl In autoconf 2.5x, AC_OUTPUT is replaced by four AC_CONFIG_* macros,
	dnl which can all be called multiple times as needed, plus one (different)
	dnl AC_OUTPUT macro. This one lists the files to be created:
	AC_CONFIG_FILES( \
	Makefile \
	AC_FOREACH([DIR], glibcxx_SUBDIRS, [DIR/Makefile ])
	)
	AC_CONFIG_FILES([scripts/testsuite_flags],[chmod +x scripts/testsuite_flags])

	dnl These commands are run at the end of config.status:
	AC_CONFIG_COMMANDS([default],
	[if test -n "$CONFIG_FILES"; then
	# Multilibs need MULTISUBDIR defined correctly in certain makefiles so
	# that multilib installs will end up installed in the correct place.
	# The testsuite needs it for multilib-aware ABI baseline files.
	# To work around this not being passed down from config-ml.in ->
	# srcdir/Makefile.am -> srcdir/{src,libsupc++,...}/Makefile.am, manually
	# append it here. Only modify Makefiles that have just been created.
	#
	# Also, get rid of this simulated-VPATH thing that automake does.
	cat > vpsed << \_EOF
	s!`test -f '$<' \|\| echo '$(srcdir)/'`!!
	_EOF
	for i in $SUBDIRS; do
	case $CONFIG_FILES in
	${i}/Makefile)
	#echo "Adding MULTISUBDIR to $i/Makefile"
	sed -f vpsed $i/Makefile > tmp
	grep '^MULTISUBDIR =' Makefile >> tmp
	mv tmp $i/Makefile
	;;
	esac
	done
	rm vpsed
	fi
	(cd include && ${MAKE-make})
	],
	[
	# Variables needed in config.status (file generation) which aren't already
	# passed by autoconf.
	SUBDIRS="$SUBDIRS"
	])

	dnl And this actually makes things happen:
	AC_OUTPUT