# 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_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.

#

#

# 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-seperated 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_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

;;

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

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 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

aix4.[3456789]* | aix[56789]*)

# 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"

OPT_LDFLAGS="-Wl,-G"

;;

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"

;;

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"

;;

freebsd*)

os_include_dir="os/bsd/freebsd"

;;

gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)

if [ "$uclibc" = "yes" ]; then

os_include_dir="os/uclibc"

else

os_include_dir="os/gnu-linux"

fi

;;

hpux*)

os_include_dir="os/hpux"

;;

irix[1-6] | irix[1-5].* | irix6.[0-4]*)

# This is known to work on at least IRIX 5.2 and 6.3.

os_include_dir="os/irix/irix5.2"

atomicity_dir=os/irix

atomic_word_dir=os/irix

;;

irix6.5*)

os_include_dir="os/irix/irix6.5"

atomicity_dir=os/irix

atomic_word_dir=os/irix

;;

mingw32*)

os_include_dir="os/mingw32"

error_constants_dir="os/mingw32"

;;

netbsd*)

os_include_dir="os/bsd/netbsd"

;;

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. solaris2.9 " 1>&2

exit 1

;;

solaris2.[789] | solaris2.1[0-9])

os_include_dir="os/solaris/solaris2.7"

;;

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 -d ${glibcxx_srcdir}/config/abi/post/${try_cpu}-linux-gnu; then

abi_baseline_pair=${try_cpu}-linux-gnu

fi

esac

case "${host}" in

arm*-*-linux-*eabi)

port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"

;;

esac

;;

powerpc*-*-darwin*)

port_specific_symbol_files="\$(srcdir)/../config/os/bsd/darwin/ppc-extra.ver"

;;

esac