# 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
;;
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 "${host_cpu}" in
arm*)
cpu_defines_dir=cpu/arm
;;
powerpc* | rs6000)
cpu_defines_dir=cpu/powerpc
;;
esac
# Set specific CPU overrides for atomic_word_dir and atomic_flags.
# Most can just use generic.
# THIS TABLE IS SORTED. KEEP IT THAT WAY.
case "${host_cpu}" in
cris*)
atomic_word_dir=cpu/cris
;;
i[4567]86 | x86_64)
atomic_flags="-march=native"
;;
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
# The sh atomicity.h is unusable
if test ${cpu_include_dir} != "cpu/sh"; then
atomicity_dir=$cpu_include_dir
fi
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 "${host_os}" in
aix[56789]*)
# Newer versions of AIX only support PowerPC architecture, so use
# atomic instructions directly.
os_include_dir="os/aix"
;;
aix4.[3456789]*)
# We set os_include_dir to os/aix only on AIX 4.3 and newer, but
# os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
# explicitly duplicate the directory for 4.[<3].
os_include_dir="os/aix"
atomicity_dir="os/aix"
;;
aix4.*)
os_include_dir="os/generic"
atomicity_dir="os/aix"
;;
aix*)
os_include_dir="os/generic"
atomicity_dir="cpu/generic"
;;
bsd*)
# Plain BSD attempts to share FreeBSD files.
os_include_dir="os/bsd/freebsd"
;;
cygwin*)
os_include_dir="os/newlib"
OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
;;
darwin[4-7] | darwin[4-7].*)
# For earlier 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="${OPT_LDFLAGS} -Wl,-single_module -Wl,-flat_namespace"
os_include_dir="os/bsd/darwin"
;;
darwin8 | darwin8.* )
# For 8+ compatibility is better if not -flat_namespace.
OPT_LDFLAGS="${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"
;;
darwin*)
# Post Darwin8, defaults should be sufficient.
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"
;;
linux-musl*)
os_include_dir="os/generic"
;;
gnu* | linux* | kfreebsd*-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
;;
rtems*)
# Use libatomic if necessary and avoid libstdc++ specific atomicity support
atomicity_dir="cpu/generic/atomicity_builtins"
;;
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])
# On Solaris 10 with Solaris ld, there's no COMDAT support. GNU ld always
# provides it, as does Solaris ld since Solaris 11, leading to different
# baselines.
case "${host_os}:${with_gnu_ld}" in
# with_gnu_ld may either be unset (default) or no (with --without-gnu-ld).
solaris2.10: | solaris2.10:no)
abi_baseline_pair=solaris2.10
;;
*)
abi_baseline_pair=solaris2.11
;;
esac
case "${host_cpu}" in
i?86 | x86_64)
abi_baseline_pair=i386-${abi_baseline_pair}
;;
sparc*)
abi_baseline_pair=sparc-${abi_baseline_pair}
;;
esac
abi_baseline_subdir_switch=--print-multi-os-directory
;;
esac