# 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