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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_std.

#

#   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.

#

#   cpu_defines_dir        location of cpu_defines.h

#                          defaults to 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_std

c_compatibility=no

atomic_word_dir=cpu/generic

cpu_defines_dir=cpu/generic

# HOST-SPECIFIC OVERRIDES

# Set any CPU-dependent bits.

# Here we override defaults and catch more general cases due to naming

# conventions (e.g., chip_name* to catch all variants).

# THIS TABLE IS SORTED.  KEEP IT THAT WAY.

case "${host_cpu}" in

  alpha*)

    try_cpu=alpha

    ;;

  arm* | xscale | ep9312)

    try_cpu=arm

    ;;

  i[567]86 | x86_64)

    try_cpu=i486

    ;;

  hppa*)

    try_cpu=hppa

    ;;

  mips*)

    # NB: cpu/mips/atomicity.h needs MIPS II or above.

    # Of course, there is no sane way to test for this, no ABI macro,

    # and no consistent host_cpu name differentiation. Therefore, only

    # use it where it is known to be safe, ie it runs linux (see below).

    try_cpu=generic

    ;;

  m680[246]0)

    try_cpu=m68k

    ;;

  powerpc* | rs6000)

    try_cpu=powerpc

    ;;

  s390x)

    try_cpu=s390

    ;;

  sparc* | ultrasparc)

    try_cpu=sparc

    ;;

  *)

    if test -d ${glibcxx_srcdir}/config/cpu/${host_cpu}; then

      try_cpu=${host_cpu}

    else

      try_cpu=generic

    fi

    ;;

esac

# Set specific CPU overrides for atomic_word_dir. Most can just use generic.

# THIS TABLE IS SORTED.  KEEP IT THAT WAY.

case "${host_cpu}" in

  cris*)

    atomic_word_dir=cpu/cris

    ;;

  sparc* | ultrasparc)

    atomic_word_dir=cpu/sparc

    ;;

esac

# 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

# 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}

abi_baseline_pair=${try_cpu}-${host_os}

unset try_cpu

if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/atomicity.h ; then

  atomicity_dir=$cpu_include_dir

else

  atomicity_dir="cpu/generic"

fi

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

  abi_tweaks_dir=$cpu_include_dir

else

  abi_tweaks_dir="cpu/generic"

fi

# Set any OS-dependent bits.

# Set the os_include_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"

    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)

    os_include_dir="os/gnu-linux"

    ;;

  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"

    ;;

  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

    ;;

  solaris2.5 | solaris2.5.[0-9])

    os_include_dir="os/solaris/solaris2.5"

    ;;

  solaris2.6)

    os_include_dir="os/solaris/solaris2.6"

    ;;

  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"

    ;;

  windiss*)

    os_include_dir="os/windiss"

    ;;

  *)

    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

  alpha*-*-freebsd5*)

    abi_baseline_pair="alpha-freebsd5"

    ;;

  arm*-*-linux*)

    abi_baseline_pair="arm-linux-gnu"

    ;;

  i*86-*-freebsd4*)

    abi_baseline_pair="i386-freebsd4"

    ;;

  i*86-*-freebsd5*)

    abi_baseline_pair="i386-freebsd5"

    ;;

  mips*-*-linux*)

    atomicity_dir="cpu/mips"

    abi_baseline_pair="mips-linux-gnu"

    cpu_include_dir="cpu/mips"

    ;;

  powerpc*-*-darwin*)

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

    ;;

  powerpc64-*-linux*)

    abi_baseline_pair="powerpc64-linux-gnu"

    ;;

  s390-*-linux*)

    abi_baseline_pair="s390-linux-gnu"

    ;;

  s390x-*-linux*)

    abi_baseline_pair="s390x-linux-gnu"

    ;;

  sparc*-*-freebsd5*)

    abi_baseline_pair="sparc-freebsd5"

    ;;

  x86_64-*-linux*)

    abi_baseline_pair="x86_64-linux-gnu"

    ;;

esac