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   mips*)
 118     try_cpu=mips
 119     ;;
 120   powerpc* | rs6000)
 121     try_cpu=powerpc
 122     ;;
 123   sparc* | ultrasparc)
 124     try_cpu=sparc
 125     ;;
 126   *)
 127     if test -d ${glibcxx_srcdir}/config/cpu/${host_cpu}; then
 128       try_cpu=${host_cpu}
 129     fi
 130 esac
 131
 132
 133 # Now look for the file(s) usually tied to a CPU model, and make
 134 # default choices for those if they haven't been explicitly set
 135 # already.
 136 cpu_include_dir=cpu/${try_cpu}
 137
 138
 139 # Set specific CPU overrides for cpu_defines_dir. Most can just use generic.
 140 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 141 case "${host_cpu}" in
 142   arm*)
 143     cpu_defines_dir=cpu/arm
 144     ;;
 145   powerpc* | rs6000)
 146     cpu_defines_dir=cpu/powerpc
 147     ;;
 148 esac
 149
 150
 151 # Set specific CPU overrides for atomic_word_dir and atomic_flags.
 152 # Most can just use generic.
 153 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 154 case "${host_cpu}" in
 155   cris*)
 156     atomic_word_dir=cpu/cris
 157     ;;
 158   i[4567]86 | x86_64)
 159     atomic_flags="-march=native"
 160     ;;
 161   sparc* | ultrasparc)
 162     atomic_word_dir=cpu/sparc
 163     atomic_flags="-mcpu=v9"
 164     ;;
 165 esac
 166
 167
 168 # Set specific CPU overrides for atomicity_dir.
 169 # This can be over-ridden in GLIBCXX_ENABLE_ATOMIC_BUILTINS.
 170 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 171 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/atomicity.h ; then
 172   atomicity_dir=$cpu_include_dir
 173 fi
 174
 175
 176 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/cxxabi_tweaks.h ; then
 177   abi_tweaks_dir=$cpu_include_dir
 178 fi
 179
 180
 181 # Set directory with CPU-specific optimization
 182 cpu_opt_dir=${cpu_include_dir}/opt
 183 test -d ${glibcxx_srcdir}/config/${cpu_include_dir}/opt ||
 184 cpu_opt_dir=cpu/generic/opt
 185 # For each header with CPU-specific optimizations check whether it
 186 # exists in ${cpu_opt_dir}.  If not, point the variable at the
 187 # appropriate file in the generic directory.
 188 cpu_opt_ext_random=${cpu_opt_dir}/ext/opt_random.h
 189 test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} ||
 190 cpu_opt_ext_random=cpu/generic/opt/ext/opt_random.h
 191
 192 cpu_opt_bits_random=${cpu_opt_dir}/bits/opt_random.h
 193 test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} ||
 194 cpu_opt_ext_random=cpu/generic/opt/bits/opt_random.h
 195
 196
 197 # Set any OS-dependent bits.
 198 # Set the os_include_dir.
 199 # Set the error_costants_dir.
 200 # Set c_model, c_compatibility here.
 201 # If atomic ops and/or numeric limits are OS-specific rather than
 202 # CPU-specifc, set those here too.
 203 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 204 case "${host_os}" in
 205   aix[56789]*)
 206     # Newer versions of AIX only support PowerPC architecture, so use
 207     # atomic instructions directly.
 208     os_include_dir="os/aix"
 209     ;;
 210   aix4.[3456789]*)
 211     # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
 212     # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
 213     # explicitly duplicate the directory for 4.[<3].
 214     os_include_dir="os/aix"
 215     atomicity_dir="os/aix"
 216     ;;
 217   aix4.*)
 218     os_include_dir="os/generic"
 219     atomicity_dir="os/aix"
 220     ;;
 221   aix*)
 222     os_include_dir="os/generic"
 223     atomicity_dir="cpu/generic"
 224     ;;
 225   bsd*)
 226     # Plain BSD attempts to share FreeBSD files.
 227     os_include_dir="os/bsd/freebsd"
 228     ;;
 229   cygwin*)
 230     os_include_dir="os/newlib"
 231     OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
 232     ;;
 233   darwin[4-7] | darwin[4-7].*)
 234     # For earlier Darwin, performance is improved if libstdc++ is
 235     # single-module. Up to at least 10.3.7, -flat_namespace is required
 236     # for proper treatment of coalesced symbols.
 237     OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module -Wl,-flat_namespace"
 238     os_include_dir="os/bsd/darwin"
 239     ;;
 240   darwin8 | darwin8.* )
 241     # For 8+ compatibility is better if not -flat_namespace.
 242     OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module"
 243     case "${host_cpu}" in
 244       i[34567]86 | x86_64)
 245         OPTIMIZE_CXXFLAGS="${OPTIMIZE_CXXFLAGS} -fvisibility-inlines-hidden"
 246         ;;
 247     esac
 248     os_include_dir="os/bsd/darwin"
 249     ;;
 250   darwin*)
 251     # Post Darwin8, defaults should be sufficient.
 252     os_include_dir="os/bsd/darwin"
 253     ;;
 254   *djgpp*)      # leading * picks up "msdosdjgpp"
 255     os_include_dir="os/djgpp"
 256     error_constants_dir="os/djgpp"
 257     ;;
 258   dragonfly*)
 259     os_include_dir="os/bsd/dragonfly"
 260     ;;
 261   freebsd*)
 262     os_include_dir="os/bsd/freebsd"
 263     ;;
 264   linux-musl*)
 265     os_include_dir="os/generic"
 266     ;;
 267   gnu* | linux* | kfreebsd*-gnu)
 268     if [ "$uclibc" = "yes" ]; then
 269       os_include_dir="os/uclibc"
 270     elif [ "$bionic" = "yes" ]; then
 271       os_include_dir="os/bionic"
 272     else
 273       os_include_dir="os/gnu-linux"
 274     fi
 275     ;;
 276   hpux*)
 277     os_include_dir="os/hpux"
 278     ;;
 279   mingw32*)
 280     case "$host" in
 281       *-w64-*)
 282         os_include_dir="os/mingw32-w64"
 283         error_constants_dir="os/mingw32-w64"
 284         ;;
 285       *)
 286         os_include_dir="os/mingw32"
 287         error_constants_dir="os/mingw32"
 288         ;;
 289     esac
 290     OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
 291     ;;
 292   netbsd*)
 293     os_include_dir="os/bsd/netbsd"
 294     ;;
 295   openbsd*)
 296     os_include_dir="os/bsd/openbsd"
 297     ;;
 298   qnx6.[12]*)
 299     os_include_dir="os/qnx/qnx6.1"
 300     c_model=c
 301     ;;
 302   rtems*)
 303     # Use libatomic if necessary and avoid libstdc++ specific atomicity support
 304     atomicity_dir="cpu/generic/atomicity_builtins"
 305     ;;
 306   solaris2)
 307     # This too-vague configuration does not provide enough information
 308     # to select a ctype include, and thus os_include_dir is a crap shoot.
 309     echo "Please specify the full version of Solaris, ie. solaris2.10 " 1>&2
 310     exit 1
 311     ;;
 312   solaris2.1[0-9])
 313     os_include_dir="os/solaris/solaris2.10"
 314     ;;
 315   tpf)
 316     os_include_dir="os/tpf"
 317     ;;
 318   vxworks)
 319     os_include_dir="os/vxworks"
 320     ;;
 321   *)
 322     os_include_dir="os/generic"
 323     ;;
 324 esac
 325
 326
 327 # Set any OS-dependent and CPU-dependent bits.
 328 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 329 case "${host}" in
 330   *-*-linux*)
 331     case "${host_cpu}" in
 332       i[567]86)
 333         abi_baseline_pair=i486-linux-gnu
 334         ;;
 335       mips64*)
 336         abi_baseline_pair=mips64-linux-gnu
 337         ;;
 338       powerpc64*)
 339         abi_baseline_pair=powerpc64-linux-gnu
 340         ;;
 341       s390)
 342         abi_baseline_pair=s390-linux-gnu
 343         ;;
 344       s390x)
 345         abi_baseline_pair=s390x-linux-gnu
 346         ;;
 347       sparc64)
 348         abi_baseline_pair=sparc64-linux-gnu
 349         ;;
 350       x86_64)
 351         abi_baseline_pair=x86_64-linux-gnu
 352         ;;
 353       *)
 354         if test $try_cpu = generic; then
 355           try_abi_cpu=$host_cpu
 356         else
 357           try_abi_cpu=$try_cpu
 358         fi
 359         if test -d ${glibcxx_srcdir}/config/abi/post/${try_abi_cpu}-linux-gnu; then
 360           abi_baseline_pair=${try_abi_cpu}-linux-gnu
 361         fi
 362     esac
 363     case "${host}" in
 364       arm*-*-linux-*)
 365         port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
 366         ;;
 367     esac
 368     ;;
 369   arm*-*-freebsd*)
 370      port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
 371      ;;
 372   powerpc*-*-darwin*)
 373     port_specific_symbol_files="\$(srcdir)/../config/os/bsd/darwin/ppc-extra.ver"
 374     ;;
 375   *-*-solaris2.1[0-9])
 376     # On Solaris 10 with Solaris ld, there's no COMDAT support.  GNU ld always
 377     # provides it, as does Solaris ld since Solaris 11, leading to different
 378     # baselines.
 379     case "${host_os}:${with_gnu_ld}" in
 380       # with_gnu_ld may either be unset (default) or no (with --without-gnu-ld).
 381       solaris2.10: | solaris2.10:no)
 382         abi_baseline_pair=solaris2.10
 383         ;;
 384       *)
 385         abi_baseline_pair=solaris2.11
 386         ;;
 387     esac
 388     case "${host_cpu}" in
 389         i?86 | x86_64)
 390             abi_baseline_pair=i386-${abi_baseline_pair}
 391             ;;
 392         sparc*)
 393             abi_baseline_pair=sparc-${abi_baseline_pair}
 394             ;;
 395     esac
 396     abi_baseline_subdir_switch=--print-multi-os-directory
 397     ;;
 398 esac