libstdc++-v3/configure.host

   1 # configure.host
   2 #
   3 # This shell script handles all host based configuration for libstdc++.
   4 # It sets various shell variables based on the the host and the
   5 # configuration options.  You can modify this shell script without needing
   6 # to rerun autoconf/aclocal/etc.  This file is "sourced" not executed.
   7 #
   8 # You should read docs/html/17_intro/porting.* to make sense of this file.
   9 #
  10 #
  11 # It uses the following shell variables as set by config.guess:
  12 #   host                The configuration host (full CPU-vendor-OS triplet)
  13 #   host_cpu            The configuration host CPU
  14 #   host_os             The configuration host OS
  15 #
  16 #
  17 # It sets the following shell variables:
  18 #
  19 #   cpu_include_dir        CPU-specific directory, defaults to cpu/generic
  20 #                          if cpu/host_cpu doesn't exist.  This is not used
  21 #                          directly, but sets the default for others.
  22 #
  23 #   os_include_dir         OS-specific directory, defaults to os/generic.
  24 #
  25 #   c_model                the "C" header model, defaults to c_global.
  26 #
  27 #   c_compatibility        if "C" compatibility headers are necessary,
  28 #                          defaults to no.
  29 #
  30 #   abi_baseline_pair      directory name for ABI compat testing,
  31 #                          defaults to host_cpu-host_os (as per config.guess)
  32 #
  33 #   abi_baseline_subdir_switch
  34 #                          g++ switch to determine ABI baseline subdir for
  35 #                          multilibbed targets,
  36 #                          defaults to --print-multi-directory
  37 #
  38 #   abi_tweaks_dir         location of cxxabi_tweaks.h,
  39 #                          defaults to cpu_include_dir
  40 #
  41 #   atomicity_dir          location of atomicity.h,
  42 #                          defaults to cpu_include_dir
  43 #
  44 #   atomic_word_dir        location of atomic_word.h
  45 #                          defaults to generic.
  46 #
  47 #   atomic_flags           extra flags to pass to use atomic instructions
  48 #                          defaults to nothing.
  49 #
  50 #   cpu_defines_dir        location of cpu_defines.h
  51 #                          defaults to generic.
  52 #
  53 #   cpu_opt_bits_random    path name of random.h containing CPU-specific
  54 #                          optimizations
  55 #
  56 #   cpu_opt_ext_random     path name of random.h containing CPU-specific
  57 #                          optimizations for extensions
  58 #
  59 #   error_constants_dir    location of error_constants.h
  60 #                          defaults to os/generic.
  61 #
  62 # It possibly modifies the following variables:
  63 #
  64 #   OPT_LDFLAGS            extra flags to pass when linking the library, of
  65 #                          the form '-Wl,blah'
  66 #                          (defaults to empty in acinclude.m4)
  67 #
  68 #   port_specific_symbol_files
  69 #                          whitespace-separated list of files containing
  70 #                          additional symbols to export from the shared
  71 #                          library, when symbol versioning is in use
  72 #
  73 #
  74 # If the defaults will not work for your platform, you need only change the
  75 # variables that won't work, i.e., you do not need to explicitly set a
  76 # working variable to its default.  Most hosts only need to change the two
  77 # *_include_dir variables.
  78
  79
  80 # DEFAULTS
  81 # Try to guess a default cpu_include_dir based on the name of the CPU.  We
  82 # cannot do this for os_include_dir; there are too many portable operating
  83 # systems out there.  :-)
  84 c_model=c_global
  85 c_compatibility=no
  86 atomic_word_dir=cpu/generic
  87 atomic_flags=""
  88 atomicity_dir="cpu/generic"
  89 cpu_defines_dir="cpu/generic"
  90 try_cpu=generic
  91 abi_baseline_subdir_switch=--print-multi-directory
  92 abi_tweaks_dir="cpu/generic"
  93 error_constants_dir="os/generic"
  94
  95 # HOST-SPECIFIC OVERRIDES
  96 # Set any CPU-dependent bits.
  97
  98 # Provide a way to funnel exotic flavors and prefixed/postfixed chip
  99 # variants into the established source config/cpu/* sub-directories.
 100 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 101 case "${host_cpu}" in
 102   alpha*)
 103     try_cpu=alpha
 104     ;;
 105   arm*)
 106     try_cpu=arm
 107     ;;
 108   crisv32)
 109     try_cpu=cris
 110     ;;
 111   i[567]86 | x86_64)
 112     try_cpu=i486
 113     ;;
 114   hppa*)
 115     try_cpu=hppa
 116     ;;
 117   mep*)
 118     EXTRA_CXX_FLAGS=-mm
 119     try_cpu=generic
 120     ;;
 121   mips*)
 122     try_cpu=mips
 123     ;;
 124   powerpc* | rs6000)
 125     try_cpu=powerpc
 126     ;;
 127   sparc* | ultrasparc)
 128     try_cpu=sparc
 129     ;;
 130   *)
 131     if test -d ${glibcxx_srcdir}/config/cpu/${host_cpu}; then
 132       try_cpu=${host_cpu}
 133     fi
 134 esac
 135
 136
 137 # Now look for the file(s) usually tied to a CPU model, and make
 138 # default choices for those if they haven't been explicitly set
 139 # already.
 140 cpu_include_dir=cpu/${try_cpu}
 141
 142
 143 # Set specific CPU overrides for cpu_defines_dir. Most can just use generic.
 144 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 145 case "${host_cpu}" in
 146   arm*)
 147     cpu_defines_dir=cpu/arm
 148     ;;
 149   powerpc* | rs6000)
 150     cpu_defines_dir=cpu/powerpc
 151     ;;
 152 esac
 153
 154
 155 # Set specific CPU overrides for atomic_word_dir and atomic_flags.
 156 # Most can just use generic.
 157 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 158 case "${host_cpu}" in
 159   cris*)
 160     atomic_word_dir=cpu/cris
 161     ;;
 162   i[4567]86 | x86_64)
 163     atomic_flags="-march=native"
 164     ;;
 165   sparc* | ultrasparc)
 166     atomic_word_dir=cpu/sparc
 167     atomic_flags="-mcpu=v9"
 168     ;;
 169 esac
 170
 171
 172 # Set specific CPU overrides for atomicity_dir.
 173 # This can be over-ridden in GLIBCXX_ENABLE_ATOMIC_BUILTINS.
 174 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 175 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/atomicity.h ; then
 176   atomicity_dir=$cpu_include_dir
 177 fi
 178
 179
 180 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/cxxabi_tweaks.h ; then
 181   abi_tweaks_dir=$cpu_include_dir
 182 fi
 183
 184
 185 # Set directory with CPU-specific optimization
 186 cpu_opt_dir=${cpu_include_dir}/opt
 187 test -d ${glibcxx_srcdir}/config/${cpu_include_dir}/opt ||
 188 cpu_opt_dir=cpu/generic/opt
 189 # For each header with CPU-specific optimizations check whether it
 190 # exists in ${cpu_opt_dir}.  If not, point the variable at the
 191 # appropriate file in the generic directory.
 192 cpu_opt_ext_random=${cpu_opt_dir}/ext/opt_random.h
 193 test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} ||
 194 cpu_opt_ext_random=cpu/generic/opt/ext/opt_random.h
 195
 196 cpu_opt_bits_random=${cpu_opt_dir}/bits/opt_random.h
 197 test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} ||
 198 cpu_opt_ext_random=cpu/generic/opt/bits/opt_random.h
 199
 200
 201 # Set any OS-dependent bits.
 202 # Set the os_include_dir.
 203 # Set the error_costants_dir.
 204 # Set c_model, c_compatibility here.
 205 # If atomic ops and/or numeric limits are OS-specific rather than
 206 # CPU-specifc, set those here too.
 207 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 208 case "${host_os}" in
 209   aix[56789]*)
 210     # Newer versions of AIX only support PowerPC architecture, so use
 211     # atomic instructions directly.
 212     os_include_dir="os/aix"
 213     ;;
 214   aix4.[3456789]*)
 215     # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
 216     # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
 217     # explicitly duplicate the directory for 4.[<3].
 218     os_include_dir="os/aix"
 219     atomicity_dir="os/aix"
 220     ;;
 221   aix4.*)
 222     os_include_dir="os/generic"
 223     atomicity_dir="os/aix"
 224     ;;
 225   aix*)
 226     os_include_dir="os/generic"
 227     atomicity_dir="cpu/generic"
 228     ;;
 229   bsd*)
 230     # Plain BSD attempts to share FreeBSD files.
 231     os_include_dir="os/bsd/freebsd"
 232     ;;
 233   cygwin*)
 234     os_include_dir="os/newlib"
 235     OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
 236     ;;
 237   darwin | darwin[1-7] | darwin[1-7].*)
 238     # On Darwin, performance is improved if libstdc++ is single-module.
 239     # Up to at least 10.3.7, -flat_namespace is required for proper
 240     # treatment of coalesced symbols.
 241     OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module -Wl,-flat_namespace"
 242     os_include_dir="os/bsd/darwin"
 243     ;;
 244   darwin[89] | darwin[89].* | darwin[1-9][0-9]* )
 245     # On Darwin, performance is improved if libstdc++ is single-module,
 246     # and on 8+ compatibility is better if not -flat_namespace.
 247     OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module"
 248     case "${host_cpu}" in
 249       i[34567]86 | x86_64)
 250         OPTIMIZE_CXXFLAGS="${OPTIMIZE_CXXFLAGS} -fvisibility-inlines-hidden"
 251         ;;
 252     esac
 253     os_include_dir="os/bsd/darwin"
 254     ;;
 255   *djgpp*)      # leading * picks up "msdosdjgpp"
 256     os_include_dir="os/djgpp"
 257     error_constants_dir="os/djgpp"
 258     ;;
 259   dragonfly*)
 260     os_include_dir="os/bsd/dragonfly"
 261     ;;
 262   freebsd*)
 263     os_include_dir="os/bsd/freebsd"
 264     ;;
 265   linux-musl*)
 266     os_include_dir="os/generic"
 267     ;;
 268   gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
 269     if [ "$uclibc" = "yes" ]; then
 270       os_include_dir="os/uclibc"
 271     elif [ "$bionic" = "yes" ]; then
 272       os_include_dir="os/bionic"
 273     else
 274       os_include_dir="os/gnu-linux"
 275     fi
 276     ;;
 277   hpux*)
 278     os_include_dir="os/hpux"
 279     ;;
 280   mingw32*)
 281     case "$host" in
 282       *-w64-*)
 283         os_include_dir="os/mingw32-w64"
 284         error_constants_dir="os/mingw32-w64"
 285         ;;
 286       *)
 287         os_include_dir="os/mingw32"
 288         error_constants_dir="os/mingw32"
 289         ;;
 290     esac
 291     OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
 292     ;;
 293   netbsd*)
 294     os_include_dir="os/bsd/netbsd"
 295     ;;
 296   openbsd*)
 297     os_include_dir="os/bsd/openbsd"
 298     ;;
 299   qnx6.[12]*)
 300     os_include_dir="os/qnx/qnx6.1"
 301     c_model=c
 302     ;;
 303   solaris2)
 304     # This too-vague configuration does not provide enough information
 305     # to select a ctype include, and thus os_include_dir is a crap shoot.
 306     echo "Please specify the full version of Solaris, ie. solaris2.10 " 1>&2
 307     exit 1
 308     ;;
 309   solaris2.1[0-9])
 310     os_include_dir="os/solaris/solaris2.10"
 311     ;;
 312   tpf)
 313     os_include_dir="os/tpf"
 314     ;;
 315   vxworks)
 316     os_include_dir="os/vxworks"
 317     ;;
 318   *)
 319     os_include_dir="os/generic"
 320     ;;
 321 esac
 322
 323
 324 # Set any OS-dependent and CPU-dependent bits.
 325 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 326 case "${host}" in
 327   *-*-linux*)
 328     case "${host_cpu}" in
 329       i[567]86)
 330         abi_baseline_pair=i486-linux-gnu
 331         ;;
 332       mips64*)
 333         abi_baseline_pair=mips64-linux-gnu
 334         ;;
 335       powerpc64*)
 336         abi_baseline_pair=powerpc64-linux-gnu
 337         ;;
 338       s390)
 339         abi_baseline_pair=s390-linux-gnu
 340         ;;
 341       s390x)
 342         abi_baseline_pair=s390x-linux-gnu
 343         ;;
 344       x86_64)
 345         abi_baseline_pair=x86_64-linux-gnu
 346         ;;
 347       *)
 348         if test $try_cpu = generic; then
 349           try_abi_cpu=$host_cpu
 350         else
 351           try_abi_cpu=$try_cpu
 352         fi
 353         if test -d ${glibcxx_srcdir}/config/abi/post/${try_abi_cpu}-linux-gnu; then
 354           abi_baseline_pair=${try_abi_cpu}-linux-gnu
 355         fi
 356     esac
 357     case "${host}" in
 358       arm*-*-linux-*)
 359         port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
 360         ;;
 361     esac
 362     ;;
 363   arm*-*-freebsd*)
 364      port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
 365      ;;
 366   powerpc*-*-darwin*)
 367     port_specific_symbol_files="\$(srcdir)/../config/os/bsd/darwin/ppc-extra.ver"
 368     ;;
 369   *-*-solaris2.1[0-9])
 370     # On Solaris 10 with Solaris ld, there's no COMDAT support.  GNU ld always
 371     # provides it, as does Solaris ld since Solaris 11, leading to different
 372     # baselines.
 373     case "${host_os}:${with_gnu_ld}" in
 374       # with_gnu_ld may either be unset (default) or no (with --without-gnu-ld).
 375       solaris2.10: | solaris2.10:no)
 376         abi_baseline_pair=solaris2.10
 377         ;;
 378       *)
 379         abi_baseline_pair=solaris2.11
 380         ;;
 381     esac
 382     abi_baseline_subdir_switch=--print-multi-os-directory
 383     ;;
 384 esac