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

 # configure.host
 #
 # This shell script handles all host based configuration for libstdc++.
 # It sets various shell variables based on the the host and the
 # configuration options.  You can modify this shell script without needing
 # to rerun autoconf/aclocal/etc.  This file is "sourced" not executed.
 #
 # You should read docs/html/17_intro/porting.* to make sense of this file.
 #
 #
 # It uses the following shell variables as set by config.guess:
 #   host                The configuration host (full CPU-vendor-OS triplet)
 #   host_cpu            The configuration host CPU
 #   host_os             The configuration host OS
 #
 #
 # It sets the following shell variables:
 #
 #   cpu_include_dir        CPU-specific directory, defaults to cpu/generic
 #                          if cpu/host_cpu doesn't exist.  This is not used
 #                          directly, but sets the default for others.
 #
 #   os_include_dir         OS-specific directory, defaults to os/generic.
 #
 #   c_model                the "C" header model, defaults to c_global.
 #
 #   c_compatibility        if "C" compatibility headers are necessary,
 #                          defaults to no.
 #
 #   abi_baseline_pair      directory name for ABI compat testing,
 #                          defaults to host_cpu-host_os (as per config.guess)
 #
 #   abi_baseline_subdir_switch
 #			   g++ switch to determine ABI baseline subdir for
 #			   multilibbed targets,
 #			   defaults to --print-multi-directory
 #
 #   abi_tweaks_dir         location of cxxabi_tweaks.h,
 #                          defaults to cpu_include_dir
 #
 #   atomicity_dir          location of atomicity.h,
 #                          defaults to cpu_include_dir
 #
 #   atomic_word_dir        location of atomic_word.h
 #                          defaults to generic.
 #
 #   atomic_flags           extra flags to pass to use atomic instructions
 #                          defaults to nothing.
 #
 #   cpu_defines_dir        location of cpu_defines.h
 #                          defaults to generic.
 #
 #   cpu_opt_bits_random    path name of random.h containing CPU-specific
 #                          optimizations
 #
 #   cpu_opt_ext_random     path name of random.h containing CPU-specific
 #                          optimizations for extensions
 #
 #   error_constants_dir    location of error_constants.h
 #                          defaults to os/generic.
 #
 # It possibly modifies the following variables:
 #
 #   OPT_LDFLAGS            extra flags to pass when linking the library, of
 #                          the form '-Wl,blah'
 #                          (defaults to empty in acinclude.m4)
 #
 #   port_specific_symbol_files
 #                          whitespace-separated list of files containing
 #                          additional symbols to export from the shared
 #                          library, when symbol versioning is in use
 #
 #
 # If the defaults will not work for your platform, you need only change the
 # variables that won't work, i.e., you do not need to explicitly set a
 # working variable to its default.  Most hosts only need to change the two
 # *_include_dir variables.


 # DEFAULTS
 # Try to guess a default cpu_include_dir based on the name of the CPU.  We
 # cannot do this for os_include_dir; there are too many portable operating
 # systems out there.  :-)
 c_model=c_global
 c_compatibility=no
 atomic_word_dir=cpu/generic
 atomic_flags=""
 atomicity_dir="cpu/generic"
 cpu_defines_dir="cpu/generic"
 try_cpu=generic
 abi_baseline_subdir_switch=--print-multi-directory
 abi_tweaks_dir="cpu/generic"
 error_constants_dir="os/generic"

 # HOST-SPECIFIC OVERRIDES
 # Set any CPU-dependent bits.

 # Provide a way to funnel exotic flavors and prefixed/postfixed chip
 # variants into the established source config/cpu/* sub-directories.
 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 case "${host_cpu}" in
   alpha*)
     try_cpu=alpha
     ;;
   arm*)
     try_cpu=arm
     ;;
   crisv32)
     try_cpu=cris
     ;;
   i[567]86 | x86_64)
     try_cpu=i486
     ;;
   hppa*)
     try_cpu=hppa
     ;;
   mep*)
     EXTRA_CXX_FLAGS=-mm
     try_cpu=generic
     ;;
   mips*)
     try_cpu=mips
     ;;
   powerpc* | rs6000)
     try_cpu=powerpc
     ;;
   sparc* | ultrasparc)
     try_cpu=sparc
     ;;
   *)
     if test -d ${glibcxx_srcdir}/config/cpu/${host_cpu}; then
       try_cpu=${host_cpu}
     fi
 esac


 # Now look for the file(s) usually tied to a CPU model, and make
 # default choices for those if they haven't been explicitly set
 # already.
 cpu_include_dir=cpu/${try_cpu}


 # Set specific CPU overrides for cpu_defines_dir. Most can just use generic.
 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 case "${host_cpu}" in
   powerpc* | rs6000)
     cpu_defines_dir=cpu/powerpc
     ;;
 esac


 # Set specific CPU overrides for atomic_word_dir and atomic_flags.
 # Most can just use generic.
 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 case "${host_cpu}" in
   aarch64*)
     atomic_word_dir=cpu/aarch64
     ;;
   alpha*)
     atomic_word_dir=cpu/alpha
     ;;
   cris*)
     atomic_word_dir=cpu/cris
     ;;
   ia64)
     atomic_word_dir=cpu/ia64
     ;;
   i[4567]86 | x86_64)
     atomic_flags="-march=native"
     ;;
   powerpc* | rs6000)
     atomic_word_dir=cpu/powerpc
     ;;
   sparc* | ultrasparc)
     atomic_word_dir=cpu/sparc
     atomic_flags="-mcpu=v9"
     ;;
 esac


 # Set specific CPU overrides for atomicity_dir.
 # This can be over-ridden in GLIBCXX_ENABLE_ATOMIC_BUILTINS.
 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/atomicity.h ; then
   atomicity_dir=$cpu_include_dir
 fi


 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/cxxabi_tweaks.h ; then
   abi_tweaks_dir=$cpu_include_dir
 fi


 # Set directory with CPU-specific optimization
 cpu_opt_dir=${cpu_include_dir}/opt
 test -d ${glibcxx_srcdir}/config/${cpu_include_dir}/opt ||
 cpu_opt_dir=cpu/generic/opt
 # For each header with CPU-specific optimizations check whether it
 # exists in ${cpu_opt_dir}.  If not, point the variable at the
 # appropriate file in the generic directory.
 cpu_opt_ext_random=${cpu_opt_dir}/ext/opt_random.h
 test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} ||
 cpu_opt_ext_random=cpu/generic/opt/ext/opt_random.h

 cpu_opt_bits_random=${cpu_opt_dir}/bits/opt_random.h
 test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} ||
 cpu_opt_ext_random=cpu/generic/opt/bits/opt_random.h


 # Set any OS-dependent bits.
 # Set the os_include_dir.
 # Set the error_costants_dir.
 # Set c_model, c_compatibility here.
 # If atomic ops and/or numeric limits are OS-specific rather than
 # CPU-specifc, set those here too.
 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 case "${host_os}" in
   aix[56789]*)
     # Newer versions of AIX only support PowerPC architecture, so use
     # atomic instructions directly.
     os_include_dir="os/aix"
     ;;
   aix4.[3456789]*)
     # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
     # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
     # explicitly duplicate the directory for 4.[<3].
     os_include_dir="os/aix"
     atomicity_dir="os/aix"
     atomic_word_dir="os/aix"
     ;;
   aix4.*)
     os_include_dir="os/generic"
     atomicity_dir="os/aix"
     atomic_word_dir="os/aix"
     ;;
   aix*)
     os_include_dir="os/generic"
     atomicity_dir="cpu/generic"
     ;;
   bsd*)
     # Plain BSD attempts to share FreeBSD files.
     os_include_dir="os/bsd/freebsd"
     ;;
   cygwin*)
     os_include_dir="os/newlib"
     OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
     ;;
   darwin | darwin[1-7] | darwin[1-7].*)
     # On Darwin, performance is improved if libstdc++ is single-module.
     # Up to at least 10.3.7, -flat_namespace is required for proper
     # treatment of coalesced symbols.
     OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module -Wl,-flat_namespace"
     os_include_dir="os/bsd/darwin"
     ;;
   darwin[89] | darwin[89].* | darwin[1-9][0-9]* )
     # On Darwin, performance is improved if libstdc++ is single-module,
     # and on 8+ compatibility is better if not -flat_namespace.
     OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module"
     case "${host_cpu}" in
       i[34567]86 | x86_64)
         OPTIMIZE_CXXFLAGS="${OPTIMIZE_CXXFLAGS} -fvisibility-inlines-hidden"
         ;;
     esac
     os_include_dir="os/bsd/darwin"
     ;;
   *djgpp*)      # leading * picks up "msdosdjgpp"
     os_include_dir="os/djgpp"
     error_constants_dir="os/djgpp"
     ;;
   dragonfly*)
     os_include_dir="os/bsd/dragonfly"
     ;;
   freebsd*)
     os_include_dir="os/bsd/freebsd"
     ;;
   gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
     if [ "$uclibc" = "yes" ]; then
       os_include_dir="os/uclibc"
     elif [ "$bionic" = "yes" ]; then
       os_include_dir="os/bionic"
     else
       os_include_dir="os/gnu-linux"
     fi
     ;;
   hpux*)
     os_include_dir="os/hpux"
     ;;
   mingw32*)
     case "$host" in
       *-w64-*)
         os_include_dir="os/mingw32-w64"
         error_constants_dir="os/mingw32-w64"
         ;;
       *)
         os_include_dir="os/mingw32"
         error_constants_dir="os/mingw32"
         ;;
     esac
     OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
     ;;
   netbsd*)
     os_include_dir="os/bsd/netbsd"
     ;;
   openbsd*)
     os_include_dir="os/bsd/openbsd"
     ;;
   qnx6.[12]*)
     os_include_dir="os/qnx/qnx6.1"
     c_model=c
     ;;
   solaris2)
     # This too-vague configuration does not provide enough information
     # to select a ctype include, and thus os_include_dir is a crap shoot.
     echo "Please specify the full version of Solaris, ie. solaris2.10 " 1>&2
     exit 1
     ;;
   solaris2.1[0-9])
     os_include_dir="os/solaris/solaris2.10"
     ;;
   tpf)
     os_include_dir="os/tpf"
     ;;
   vxworks)
     os_include_dir="os/vxworks"
     ;;
   *)
     os_include_dir="os/generic"
     ;;
 esac


 # Set any OS-dependent and CPU-dependent bits.
 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 case "${host}" in
   *-*-linux*)
     case "${host_cpu}" in
       i[567]86)
         abi_baseline_pair=i486-linux-gnu
         ;;
       mips64*)
 	abi_baseline_pair=mips64-linux-gnu
 	;;
       powerpc64*)
         abi_baseline_pair=powerpc64-linux-gnu
         ;;
       s390)
         abi_baseline_pair=s390-linux-gnu
         ;;
       s390x)
         abi_baseline_pair=s390x-linux-gnu
         ;;
       x86_64)
         abi_baseline_pair=x86_64-linux-gnu
         ;;
       *)
         if test $try_cpu = generic; then
           try_abi_cpu=$host_cpu
         else
           try_abi_cpu=$try_cpu
         fi
         if test -d ${glibcxx_srcdir}/config/abi/post/${try_abi_cpu}-linux-gnu; then
           abi_baseline_pair=${try_abi_cpu}-linux-gnu
         fi
     esac
     case "${host}" in
       arm*-*-linux-*)
 	port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
 	;;
     esac
     ;;
   arm*-*-freebsd*)
      port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
      ;;
   powerpc*-*-darwin*)
     port_specific_symbol_files="\$(srcdir)/../config/os/bsd/darwin/ppc-extra.ver"
     ;;
   *-*-solaris2.1[0-9])
     abi_baseline_pair=solaris2.10
     abi_baseline_subdir_switch=--print-multi-os-directory
     ;;
 esac
	# configure.host
	#
	# This shell script handles all host based configuration for libstdc++.
	# It sets various shell variables based on the the host and the
	# configuration options. You can modify this shell script without needing
	# to rerun autoconf/aclocal/etc. This file is "sourced" not executed.
	#
	# You should read docs/html/17_intro/porting.* to make sense of this file.
	#
	#
	# It uses the following shell variables as set by config.guess:
	# host The configuration host (full CPU-vendor-OS triplet)
	# host_cpu The configuration host CPU
	# host_os The configuration host OS
	#
	#
	# It sets the following shell variables:
	#
	# cpu_include_dir CPU-specific directory, defaults to cpu/generic
	# if cpu/host_cpu doesn't exist. This is not used
	# directly, but sets the default for others.
	#
	# os_include_dir OS-specific directory, defaults to os/generic.
	#
	# c_model the "C" header model, defaults to c_global.
	#
	# c_compatibility if "C" compatibility headers are necessary,
	# defaults to no.
	#
	# abi_baseline_pair directory name for ABI compat testing,
	# defaults to host_cpu-host_os (as per config.guess)
	#
	# abi_baseline_subdir_switch
	# g++ switch to determine ABI baseline subdir for
	# multilibbed targets,
	# defaults to --print-multi-directory
	#
	# abi_tweaks_dir location of cxxabi_tweaks.h,
	# defaults to cpu_include_dir
	#
	# atomicity_dir location of atomicity.h,
	# defaults to cpu_include_dir
	#
	# atomic_word_dir location of atomic_word.h
	# defaults to generic.
	#
	# atomic_flags extra flags to pass to use atomic instructions
	# defaults to nothing.
	#
	# cpu_defines_dir location of cpu_defines.h
	# defaults to generic.
	#
	# cpu_opt_bits_random path name of random.h containing CPU-specific
	# optimizations
	#
	# cpu_opt_ext_random path name of random.h containing CPU-specific
	# optimizations for extensions
	#
	# error_constants_dir location of error_constants.h
	# defaults to os/generic.
	#
	# It possibly modifies the following variables:
	#
	# OPT_LDFLAGS extra flags to pass when linking the library, of
	# the form '-Wl,blah'
	# (defaults to empty in acinclude.m4)
	#
	# port_specific_symbol_files
	# whitespace-separated list of files containing
	# additional symbols to export from the shared
	# library, when symbol versioning is in use
	#
	#
	# If the defaults will not work for your platform, you need only change the
	# variables that won't work, i.e., you do not need to explicitly set a
	# working variable to its default. Most hosts only need to change the two
	# *_include_dir variables.


	# DEFAULTS
	# Try to guess a default cpu_include_dir based on the name of the CPU. We
	# cannot do this for os_include_dir; there are too many portable operating
	# systems out there. :-)
	c_model=c_global
	c_compatibility=no
	atomic_word_dir=cpu/generic
	atomic_flags=""
	atomicity_dir="cpu/generic"
	cpu_defines_dir="cpu/generic"
	try_cpu=generic
	abi_baseline_subdir_switch=--print-multi-directory
	abi_tweaks_dir="cpu/generic"
	error_constants_dir="os/generic"

	# HOST-SPECIFIC OVERRIDES
	# Set any CPU-dependent bits.

	# Provide a way to funnel exotic flavors and prefixed/postfixed chip
	# variants into the established source config/cpu/* sub-directories.
	# THIS TABLE IS SORTED. KEEP IT THAT WAY.
	case "${host_cpu}" in
	alpha*)
	try_cpu=alpha
	;;
	arm*)
	try_cpu=arm
	;;
	crisv32)
	try_cpu=cris
	;;
	i[567]86 \| x86_64)
	try_cpu=i486
	;;
	hppa*)
	try_cpu=hppa
	;;
	mep*)
	EXTRA_CXX_FLAGS=-mm
	try_cpu=generic
	;;
	mips*)
	try_cpu=mips
	;;
	powerpc* \| rs6000)
	try_cpu=powerpc
	;;
	sparc* \| ultrasparc)
	try_cpu=sparc
	;;
	*)
	if test -d ${glibcxx_srcdir}/config/cpu/${host_cpu}; then
	try_cpu=${host_cpu}
	fi
	esac


	# Now look for the file(s) usually tied to a CPU model, and make
	# default choices for those if they haven't been explicitly set
	# already.
	cpu_include_dir=cpu/${try_cpu}


	# Set specific CPU overrides for cpu_defines_dir. Most can just use generic.
	# THIS TABLE IS SORTED. KEEP IT THAT WAY.
	case "${host_cpu}" in
	powerpc* \| rs6000)
	cpu_defines_dir=cpu/powerpc
	;;
	esac


	# Set specific CPU overrides for atomic_word_dir and atomic_flags.
	# Most can just use generic.
	# THIS TABLE IS SORTED. KEEP IT THAT WAY.
	case "${host_cpu}" in
	aarch64*)
	atomic_word_dir=cpu/aarch64
	;;
	alpha*)
	atomic_word_dir=cpu/alpha
	;;
	cris*)
	atomic_word_dir=cpu/cris
	;;
	ia64)
	atomic_word_dir=cpu/ia64
	;;
	i[4567]86 \| x86_64)
	atomic_flags="-march=native"
	;;
	powerpc* \| rs6000)
	atomic_word_dir=cpu/powerpc
	;;
	sparc* \| ultrasparc)
	atomic_word_dir=cpu/sparc
	atomic_flags="-mcpu=v9"
	;;
	esac


	# Set specific CPU overrides for atomicity_dir.
	# This can be over-ridden in GLIBCXX_ENABLE_ATOMIC_BUILTINS.
	# THIS TABLE IS SORTED. KEEP IT THAT WAY.
	if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/atomicity.h ; then
	atomicity_dir=$cpu_include_dir
	fi


	if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/cxxabi_tweaks.h ; then
	abi_tweaks_dir=$cpu_include_dir
	fi


	# Set directory with CPU-specific optimization
	cpu_opt_dir=${cpu_include_dir}/opt
	test -d ${glibcxx_srcdir}/config/${cpu_include_dir}/opt \|\|
	cpu_opt_dir=cpu/generic/opt
	# For each header with CPU-specific optimizations check whether it
	# exists in ${cpu_opt_dir}. If not, point the variable at the
	# appropriate file in the generic directory.
	cpu_opt_ext_random=${cpu_opt_dir}/ext/opt_random.h
	test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} \|\|
	cpu_opt_ext_random=cpu/generic/opt/ext/opt_random.h

	cpu_opt_bits_random=${cpu_opt_dir}/bits/opt_random.h
	test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} \|\|
	cpu_opt_ext_random=cpu/generic/opt/bits/opt_random.h


	# Set any OS-dependent bits.
	# Set the os_include_dir.
	# Set the error_costants_dir.
	# Set c_model, c_compatibility here.
	# If atomic ops and/or numeric limits are OS-specific rather than
	# CPU-specifc, set those here too.
	# THIS TABLE IS SORTED. KEEP IT THAT WAY.
	case "${host_os}" in
	aix[56789]*)
	# Newer versions of AIX only support PowerPC architecture, so use
	# atomic instructions directly.
	os_include_dir="os/aix"
	;;
	aix4.[3456789]*)
	# We set os_include_dir to os/aix only on AIX 4.3 and newer, but
	# os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
	# explicitly duplicate the directory for 4.[<3].
	os_include_dir="os/aix"
	atomicity_dir="os/aix"
	atomic_word_dir="os/aix"
	;;
	aix4.*)
	os_include_dir="os/generic"
	atomicity_dir="os/aix"
	atomic_word_dir="os/aix"
	;;
	aix*)
	os_include_dir="os/generic"
	atomicity_dir="cpu/generic"
	;;
	bsd*)
	# Plain BSD attempts to share FreeBSD files.
	os_include_dir="os/bsd/freebsd"
	;;
	cygwin*)
	os_include_dir="os/newlib"
	OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
	;;
	darwin \| darwin[1-7] \| darwin[1-7].*)
	# On Darwin, performance is improved if libstdc++ is single-module.
	# Up to at least 10.3.7, -flat_namespace is required for proper
	# treatment of coalesced symbols.
	OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module -Wl,-flat_namespace"
	os_include_dir="os/bsd/darwin"
	;;
	darwin[89] \| darwin[89].* \| darwin[1-9][0-9]* )
	# On Darwin, performance is improved if libstdc++ is single-module,
	# and on 8+ compatibility is better if not -flat_namespace.
	OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module"
	case "${host_cpu}" in
	i[34567]86 \| x86_64)
	OPTIMIZE_CXXFLAGS="${OPTIMIZE_CXXFLAGS} -fvisibility-inlines-hidden"
	;;
	esac
	os_include_dir="os/bsd/darwin"
	;;
	djgpp) # leading * picks up "msdosdjgpp"
	os_include_dir="os/djgpp"
	error_constants_dir="os/djgpp"
	;;
	dragonfly*)
	os_include_dir="os/bsd/dragonfly"
	;;
	freebsd*)
	os_include_dir="os/bsd/freebsd"
	;;
	gnu* \| linux* \| kfreebsd-gnu \| knetbsd-gnu)
	if [ "$uclibc" = "yes" ]; then
	os_include_dir="os/uclibc"
	elif [ "$bionic" = "yes" ]; then
	os_include_dir="os/bionic"
	else
	os_include_dir="os/gnu-linux"
	fi
	;;
	hpux*)
	os_include_dir="os/hpux"
	;;
	mingw32*)
	case "$host" in
	-w64-)
	os_include_dir="os/mingw32-w64"
	error_constants_dir="os/mingw32-w64"
	;;
	*)
	os_include_dir="os/mingw32"
	error_constants_dir="os/mingw32"
	;;
	esac
	OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
	;;
	netbsd*)
	os_include_dir="os/bsd/netbsd"
	;;
	openbsd*)
	os_include_dir="os/bsd/openbsd"
	;;
	qnx6.[12]*)
	os_include_dir="os/qnx/qnx6.1"
	c_model=c
	;;
	solaris2)
	# This too-vague configuration does not provide enough information
	# to select a ctype include, and thus os_include_dir is a crap shoot.
	echo "Please specify the full version of Solaris, ie. solaris2.10 " 1>&2
	exit 1
	;;
	solaris2.1[0-9])
	os_include_dir="os/solaris/solaris2.10"
	;;
	tpf)
	os_include_dir="os/tpf"
	;;
	vxworks)
	os_include_dir="os/vxworks"
	;;
	*)
	os_include_dir="os/generic"
	;;
	esac


	# Set any OS-dependent and CPU-dependent bits.
	# THIS TABLE IS SORTED. KEEP IT THAT WAY.
	case "${host}" in
	--linux*)
	case "${host_cpu}" in
	i[567]86)
	abi_baseline_pair=i486-linux-gnu
	;;
	mips64*)
	abi_baseline_pair=mips64-linux-gnu
	;;
	powerpc64*)
	abi_baseline_pair=powerpc64-linux-gnu
	;;
	s390)
	abi_baseline_pair=s390-linux-gnu
	;;
	s390x)
	abi_baseline_pair=s390x-linux-gnu
	;;
	x86_64)
	abi_baseline_pair=x86_64-linux-gnu
	;;
	*)
	if test $try_cpu = generic; then
	try_abi_cpu=$host_cpu
	else
	try_abi_cpu=$try_cpu
	fi
	if test -d ${glibcxx_srcdir}/config/abi/post/${try_abi_cpu}-linux-gnu; then
	abi_baseline_pair=${try_abi_cpu}-linux-gnu
	fi
	esac
	case "${host}" in
	arm--linux-*)
	port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
	;;
	esac
	;;
	arm--freebsd*)
	port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
	;;
	powerpc--darwin*)
	port_specific_symbol_files="\$(srcdir)/../config/os/bsd/darwin/ppc-extra.ver"
	;;
	--solaris2.1[0-9])
	abi_baseline_pair=solaris2.10
	abi_baseline_subdir_switch=--print-multi-os-directory
	;;
	esac