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# 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.

#

#

#   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_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

  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"

    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"

    ;;

  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"

    ;;

  irix6.5*)

    os_include_dir="os/irix/irix6.5"

    atomicity_dir=os/irix

    atomic_word_dir=os/irix

    # libstdc++.so relies on emutls on IRIX, which only works with the

    # real functions implemented in libpthread.so, not with the stubs in

    # libc, so always pass -lpthread.

    OPT_LDFLAGS="${OPT_LDFLAGS} -lpthread"

    ;;

  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"

    ;;

  osf*)

    os_include_dir="os/osf"

    # libstdc++.so relies on emutls on Tru64 UNIX, which only works with the

    # real functions implemented in libpthread.so, not with the dummies in

    # libgcc, so always pass -lpthread.

    OPT_LDFLAGS="${OPT_LDFLAGS} -lpthread"

    ;;

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

    os_include_dir="os/solaris/solaris2.8"

    ;;

  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"

    ;;

  *-*-solaris2.[89])

    abi_baseline_pair=solaris2.8

    abi_baseline_subdir_switch=--print-multi-os-directory

    ;;

  *-*-solaris2.1[0-9])

    abi_baseline_pair=solaris2.10

    abi_baseline_subdir_switch=--print-multi-os-directory

    ;;

esac