385 lines
11 KiB
Plaintext
385 lines
11 KiB
Plaintext
# configure.host
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#
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# This shell script handles all host based configuration for libstdc++.
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# It sets various shell variables based on the the host and the
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# configuration options. You can modify this shell script without needing
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# to rerun autoconf/aclocal/etc. This file is "sourced" not executed.
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#
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# You should read docs/html/17_intro/porting.* to make sense of this file.
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#
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#
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# It uses the following shell variables as set by config.guess:
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# host The configuration host (full CPU-vendor-OS triplet)
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# host_cpu The configuration host CPU
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# host_os The configuration host OS
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#
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#
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# It sets the following shell variables:
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#
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# cpu_include_dir CPU-specific directory, defaults to cpu/generic
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# if cpu/host_cpu doesn't exist. This is not used
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# directly, but sets the default for others.
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#
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# os_include_dir OS-specific directory, defaults to os/generic.
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#
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# c_model the "C" header model, defaults to c_global.
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#
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# c_compatibility if "C" compatibility headers are necessary,
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# defaults to no.
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#
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# abi_baseline_pair directory name for ABI compat testing,
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# defaults to host_cpu-host_os (as per config.guess)
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#
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# abi_baseline_subdir_switch
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# g++ switch to determine ABI baseline subdir for
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# multilibbed targets,
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# defaults to --print-multi-directory
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#
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# abi_tweaks_dir location of cxxabi_tweaks.h,
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# defaults to cpu_include_dir
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#
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# atomicity_dir location of atomicity.h,
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# defaults to cpu_include_dir
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#
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# atomic_word_dir location of atomic_word.h
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# defaults to generic.
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#
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# atomic_flags extra flags to pass to use atomic instructions
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# defaults to nothing.
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#
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# cpu_defines_dir location of cpu_defines.h
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# defaults to generic.
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#
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# cpu_opt_bits_random path name of random.h containing CPU-specific
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# optimizations
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#
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# cpu_opt_ext_random path name of random.h containing CPU-specific
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# optimizations for extensions
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#
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# error_constants_dir location of error_constants.h
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# defaults to os/generic.
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#
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# It possibly modifies the following variables:
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#
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# OPT_LDFLAGS extra flags to pass when linking the library, of
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# the form '-Wl,blah'
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# (defaults to empty in acinclude.m4)
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#
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# port_specific_symbol_files
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# whitespace-separated list of files containing
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# additional symbols to export from the shared
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# library, when symbol versioning is in use
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#
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#
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# If the defaults will not work for your platform, you need only change the
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# variables that won't work, i.e., you do not need to explicitly set a
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# working variable to its default. Most hosts only need to change the two
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# *_include_dir variables.
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# DEFAULTS
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# Try to guess a default cpu_include_dir based on the name of the CPU. We
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# cannot do this for os_include_dir; there are too many portable operating
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# systems out there. :-)
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c_model=c_global
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c_compatibility=no
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atomic_word_dir=cpu/generic
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atomic_flags=""
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atomicity_dir="cpu/generic"
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cpu_defines_dir="cpu/generic"
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try_cpu=generic
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abi_baseline_subdir_switch=--print-multi-directory
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abi_tweaks_dir="cpu/generic"
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error_constants_dir="os/generic"
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# HOST-SPECIFIC OVERRIDES
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# Set any CPU-dependent bits.
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# Provide a way to funnel exotic flavors and prefixed/postfixed chip
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# variants into the established source config/cpu/* sub-directories.
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# THIS TABLE IS SORTED. KEEP IT THAT WAY.
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case "${host_cpu}" in
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alpha*)
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try_cpu=alpha
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;;
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arm*)
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try_cpu=arm
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;;
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crisv32)
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try_cpu=cris
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;;
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i[567]86 | x86_64)
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try_cpu=i486
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;;
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hppa*)
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try_cpu=hppa
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;;
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mep*)
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EXTRA_CXX_FLAGS=-mm
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try_cpu=generic
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;;
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mips*)
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try_cpu=mips
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;;
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powerpc* | rs6000)
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try_cpu=powerpc
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;;
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sparc* | ultrasparc)
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try_cpu=sparc
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;;
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*)
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if test -d ${glibcxx_srcdir}/config/cpu/${host_cpu}; then
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try_cpu=${host_cpu}
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fi
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esac
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# Now look for the file(s) usually tied to a CPU model, and make
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# default choices for those if they haven't been explicitly set
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# already.
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cpu_include_dir=cpu/${try_cpu}
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# Set specific CPU overrides for cpu_defines_dir. Most can just use generic.
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# THIS TABLE IS SORTED. KEEP IT THAT WAY.
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case "${host_cpu}" in
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arm*)
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cpu_defines_dir=cpu/arm
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;;
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powerpc* | rs6000)
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cpu_defines_dir=cpu/powerpc
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;;
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esac
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# Set specific CPU overrides for atomic_word_dir and atomic_flags.
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# Most can just use generic.
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# THIS TABLE IS SORTED. KEEP IT THAT WAY.
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case "${host_cpu}" in
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cris*)
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atomic_word_dir=cpu/cris
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;;
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i[4567]86 | x86_64)
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atomic_flags="-march=native"
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;;
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sparc* | ultrasparc)
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atomic_word_dir=cpu/sparc
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atomic_flags="-mcpu=v9"
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;;
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esac
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# Set specific CPU overrides for atomicity_dir.
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# This can be over-ridden in GLIBCXX_ENABLE_ATOMIC_BUILTINS.
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# THIS TABLE IS SORTED. KEEP IT THAT WAY.
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if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/atomicity.h ; then
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atomicity_dir=$cpu_include_dir
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fi
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if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/cxxabi_tweaks.h ; then
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abi_tweaks_dir=$cpu_include_dir
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fi
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# Set directory with CPU-specific optimization
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cpu_opt_dir=${cpu_include_dir}/opt
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test -d ${glibcxx_srcdir}/config/${cpu_include_dir}/opt ||
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cpu_opt_dir=cpu/generic/opt
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# For each header with CPU-specific optimizations check whether it
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# exists in ${cpu_opt_dir}. If not, point the variable at the
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# appropriate file in the generic directory.
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cpu_opt_ext_random=${cpu_opt_dir}/ext/opt_random.h
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test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} ||
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cpu_opt_ext_random=cpu/generic/opt/ext/opt_random.h
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cpu_opt_bits_random=${cpu_opt_dir}/bits/opt_random.h
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test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} ||
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cpu_opt_ext_random=cpu/generic/opt/bits/opt_random.h
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# Set any OS-dependent bits.
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# Set the os_include_dir.
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# Set the error_costants_dir.
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# Set c_model, c_compatibility here.
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# If atomic ops and/or numeric limits are OS-specific rather than
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# CPU-specifc, set those here too.
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# THIS TABLE IS SORTED. KEEP IT THAT WAY.
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case "${host_os}" in
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aix[56789]*)
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# Newer versions of AIX only support PowerPC architecture, so use
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# atomic instructions directly.
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os_include_dir="os/aix"
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;;
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aix4.[3456789]*)
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# We set os_include_dir to os/aix only on AIX 4.3 and newer, but
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# os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
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# explicitly duplicate the directory for 4.[<3].
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os_include_dir="os/aix"
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atomicity_dir="os/aix"
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;;
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aix4.*)
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os_include_dir="os/generic"
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atomicity_dir="os/aix"
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;;
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aix*)
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os_include_dir="os/generic"
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atomicity_dir="cpu/generic"
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;;
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bsd*)
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# Plain BSD attempts to share FreeBSD files.
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os_include_dir="os/bsd/freebsd"
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;;
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cygwin*)
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os_include_dir="os/newlib"
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OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
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;;
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darwin | darwin[1-7] | darwin[1-7].*)
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# On Darwin, performance is improved if libstdc++ is single-module.
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# Up to at least 10.3.7, -flat_namespace is required for proper
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# treatment of coalesced symbols.
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OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module -Wl,-flat_namespace"
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os_include_dir="os/bsd/darwin"
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;;
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darwin[89] | darwin[89].* | darwin[1-9][0-9]* )
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# On Darwin, performance is improved if libstdc++ is single-module,
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# and on 8+ compatibility is better if not -flat_namespace.
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OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module"
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case "${host_cpu}" in
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i[34567]86 | x86_64)
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OPTIMIZE_CXXFLAGS="${OPTIMIZE_CXXFLAGS} -fvisibility-inlines-hidden"
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;;
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esac
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os_include_dir="os/bsd/darwin"
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;;
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*djgpp*) # leading * picks up "msdosdjgpp"
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os_include_dir="os/djgpp"
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error_constants_dir="os/djgpp"
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;;
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dragonfly*)
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os_include_dir="os/bsd/dragonfly"
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;;
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freebsd*)
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os_include_dir="os/bsd/freebsd"
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;;
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linux-musl*)
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os_include_dir="os/generic"
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;;
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gnu* | linux* | kfreebsd*-gnu)
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if [ "$uclibc" = "yes" ]; then
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os_include_dir="os/uclibc"
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elif [ "$bionic" = "yes" ]; then
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os_include_dir="os/bionic"
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else
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os_include_dir="os/gnu-linux"
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fi
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;;
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hpux*)
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os_include_dir="os/hpux"
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;;
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mingw32*)
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case "$host" in
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*-w64-*)
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os_include_dir="os/mingw32-w64"
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error_constants_dir="os/mingw32-w64"
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;;
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*)
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os_include_dir="os/mingw32"
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error_constants_dir="os/mingw32"
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;;
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esac
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OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
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;;
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netbsd*)
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os_include_dir="os/bsd/netbsd"
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;;
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openbsd*)
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os_include_dir="os/bsd/openbsd"
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;;
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qnx6.[12]*)
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os_include_dir="os/qnx/qnx6.1"
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c_model=c
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;;
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solaris2)
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# This too-vague configuration does not provide enough information
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# to select a ctype include, and thus os_include_dir is a crap shoot.
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echo "Please specify the full version of Solaris, ie. solaris2.10 " 1>&2
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exit 1
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;;
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solaris2.1[0-9])
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os_include_dir="os/solaris/solaris2.10"
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;;
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tpf)
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os_include_dir="os/tpf"
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;;
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vxworks)
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os_include_dir="os/vxworks"
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;;
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*)
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os_include_dir="os/generic"
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;;
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esac
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# Set any OS-dependent and CPU-dependent bits.
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# THIS TABLE IS SORTED. KEEP IT THAT WAY.
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case "${host}" in
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*-*-linux*)
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case "${host_cpu}" in
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i[567]86)
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abi_baseline_pair=i486-linux-gnu
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;;
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mips64*)
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abi_baseline_pair=mips64-linux-gnu
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;;
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powerpc64*)
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abi_baseline_pair=powerpc64-linux-gnu
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;;
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s390)
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abi_baseline_pair=s390-linux-gnu
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;;
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s390x)
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abi_baseline_pair=s390x-linux-gnu
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;;
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x86_64)
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abi_baseline_pair=x86_64-linux-gnu
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;;
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*)
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if test $try_cpu = generic; then
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try_abi_cpu=$host_cpu
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else
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try_abi_cpu=$try_cpu
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fi
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if test -d ${glibcxx_srcdir}/config/abi/post/${try_abi_cpu}-linux-gnu; then
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abi_baseline_pair=${try_abi_cpu}-linux-gnu
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fi
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esac
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case "${host}" in
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arm*-*-linux-*)
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port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
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;;
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esac
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;;
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arm*-*-freebsd*)
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port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
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;;
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powerpc*-*-darwin*)
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port_specific_symbol_files="\$(srcdir)/../config/os/bsd/darwin/ppc-extra.ver"
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;;
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*-*-solaris2.1[0-9])
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# On Solaris 10 with Solaris ld, there's no COMDAT support. GNU ld always
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# provides it, as does Solaris ld since Solaris 11, leading to different
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# baselines.
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case "${host_os}:${with_gnu_ld}" in
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# with_gnu_ld may either be unset (default) or no (with --without-gnu-ld).
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solaris2.10: | solaris2.10:no)
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abi_baseline_pair=solaris2.10
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;;
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*)
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abi_baseline_pair=solaris2.11
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;;
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esac
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abi_baseline_subdir_switch=--print-multi-os-directory
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;;
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esac
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