# 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.
+# 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.
-# This shell script should be invoked as
-# . configure.host
-# If it encounters an error, it will exit with a message.
-# It uses the following shell variables:
-# host The configuration host
-# host_cpu The configuration host CPU
-# target_optspace --enable-target-optspace ("yes", "no", "")
+# 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
+ ;;
+ 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=${host_cpu}
+ fi
+esac
-# It sets the following shell variables:
+# Now look for the file(s) usually tied to a CPU model, and make
+# default choices for those if they haven't been explicitly set
+# already.
+cpu_include_dir=cpu/${try_cpu}
-AM_RUNTESTFLAGS=
-# Set any host dependent compiler flags.
+# Set specific CPU overrides for cpu_defines_dir. Most can just use generic.
# THIS TABLE IS SORTED. KEEP IT THAT WAY.
+case "${host_cpu}" in
+ powerpc* | rs6000)
+ cpu_defines_dir=cpu/powerpc
+ ;;
+esac
-case "${host}" in
+# 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="${OPT_LDFLAGS} -no-undefined -bindir \$(bindir)"
+ ;;
+ darwin | darwin[1-7] | darwin[1-7].*)
+ # On Darwin, performance is improved if libstdc++ is single-module.
+ # Up to at least 10.3.7, -flat_namespace is required for proper
+ # treatment of coalesced symbols.
+ OPT_LDFLAGS="${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"
+ ;;
+ 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"
+ OPT_LDFLAGS="${OPT_LDFLAGS} -no-undefined -bindir \$(bindir)"
+ ;;
+ netbsd*)
+ os_include_dir="os/bsd/netbsd"
+ ;;
+ qnx6.[12]*)
+ os_include_dir="os/qnx/qnx6.1"
+ c_model=c
+ ;;
+ solaris2)
+ # This too-vague configuration does not provide enough information
+ # to select a ctype include, and thus os_include_dir is a crap shoot.
+ echo "Please specify the full version of Solaris, ie. solaris2.9 " 1>&2
+ exit 1
+ ;;
+ solaris2.[89] | solaris2.1[0-9])
+ os_include_dir="os/solaris/solaris2.7"
+ ;;
+ tpf)
+ os_include_dir="os/tpf"
+ ;;
+ vxworks)
+ os_include_dir="os/vxworks"
+ ;;
*)
+ os_include_dir="os/generic"
;;
esac
+# Set any OS-dependent and CPU-dependent bits.
+# THIS TABLE IS SORTED. KEEP IT THAT WAY.
+case "${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
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