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 #
  54 #   error_constants_dir    location of error_constants.h
  55 #                          defaults to os/generic.
  56 #
  57 # It possibly modifies the following variables:
  58 #
  59 #   OPT_LDFLAGS            extra flags to pass when linking the library, of
  60 #                          the form '-Wl,blah'
  61 #                          (defaults to empty in acinclude.m4)
  62 #
  63 #   port_specific_symbol_files
  64 #                          whitespace-seperated list of files containing
  65 #                          additional symbols to export from the shared
  66 #                          library, when symbol versioning is in use
  67 #
  68 #
  69 # If the defaults will not work for your platform, you need only change the
  70 # variables that won't work, i.e., you do not need to explicitly set a
  71 # working variable to its default.  Most hosts only need to change the two
  72 # *_include_dir variables.
  73
  74
  75 # DEFAULTS
  76 # Try to guess a default cpu_include_dir based on the name of the CPU.  We
  77 # cannot do this for os_include_dir; there are too many portable operating
  78 # systems out there.  :-)
  79 c_model=c_global
  80 c_compatibility=no
  81 atomic_word_dir=cpu/generic
  82 atomic_flags=""
  83 atomicity_dir="cpu/generic"
  84 cpu_defines_dir="cpu/generic"
  85 try_cpu=generic
  86 abi_baseline_subdir_switch=--print-multi-directory
  87 abi_tweaks_dir="cpu/generic"
  88 error_constants_dir="os/generic"
  89
  90 # HOST-SPECIFIC OVERRIDES
  91 # Set any CPU-dependent bits.
  92
  93 # Provide a way to funnel exotic flavors and prefixed/postfixed chip
  94 # variants into the established source config/cpu/* sub-directories.
  95 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
  96 case "${host_cpu}" in
  97   alpha*)
  98     try_cpu=alpha
  99     ;;
 100   arm*)
 101     try_cpu=arm
 102     ;;
 103   crisv32)
 104     try_cpu=cris
 105     ;;
 106   i[567]86 | x86_64)
 107     try_cpu=i486
 108     ;;
 109   hppa*)
 110     try_cpu=hppa
 111     ;;
 112   mep*)
 113     EXTRA_CXX_FLAGS=-mm
 114     try_cpu=generic
 115     ;;
 116   mips*)
 117     try_cpu=mips
 118     ;;
 119   powerpc* | rs6000)
 120     try_cpu=powerpc
 121     ;;
 122   sparc* | ultrasparc)
 123     try_cpu=sparc
 124     ;;
 125   *)
 126     if test -d ${glibcxx_srcdir}/config/cpu/${host_cpu}; then
 127       try_cpu=${host_cpu}
 128     fi
 129 esac
 130
 131
 132 # Now look for the file(s) usually tied to a CPU model, and make
 133 # default choices for those if they haven't been explicitly set
 134 # already.
 135 cpu_include_dir=cpu/${try_cpu}
 136
 137
 138 # Set specific CPU overrides for cpu_defines_dir. Most can just use generic.
 139 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 140 case "${host_cpu}" in
 141   powerpc* | rs6000)
 142     cpu_defines_dir=cpu/powerpc
 143     ;;
 144 esac
 145
 146
 147 # Set specific CPU overrides for atomic_word_dir and atomic_flags.
 148 # Most can just use generic.
 149 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 150 case "${host_cpu}" in
 151   alpha*)
 152     atomic_word_dir=cpu/alpha
 153     ;;
 154   cris*)
 155     atomic_word_dir=cpu/cris
 156     ;;
 157   ia64)
 158     atomic_word_dir=cpu/ia64
 159     ;;
 160   i[4567]86 | x86_64)
 161     atomic_flags="-march=native"
 162     ;;
 163   powerpc* | rs6000)
 164     atomic_word_dir=cpu/powerpc
 165     ;;
 166   sparc* | ultrasparc)
 167     atomic_word_dir=cpu/sparc
 168     atomic_flags="-mcpu=v9"
 169     ;;
 170 esac
 171
 172
 173 # Set specific CPU overrides for atomicity_dir.
 174 # This can be over-ridden in GLIBCXX_ENABLE_ATOMIC_BUILTINS.
 175 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 176 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/atomicity.h ; then
 177   atomicity_dir=$cpu_include_dir
 178 fi
 179
 180
 181 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/cxxabi_tweaks.h ; then
 182   abi_tweaks_dir=$cpu_include_dir
 183 fi
 184
 185
 186 # Set any OS-dependent bits.
 187 # Set the os_include_dir.
 188 # Set the error_costants_dir.
 189 # Set c_model, c_compatibility here.
 190 # If atomic ops and/or numeric limits are OS-specific rather than
 191 # CPU-specifc, set those here too.
 192 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 193 case "${host_os}" in
 194   aix4.[3456789]* | aix[56789]*)
 195     # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
 196     # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
 197     # explicitly duplicate the directory for 4.[<3].
 198     os_include_dir="os/aix"
 199     atomicity_dir="os/aix"
 200     atomic_word_dir="os/aix"
 201     OPT_LDFLAGS="-Wl,-G"
 202     ;;
 203   aix4.*)
 204     os_include_dir="os/generic"
 205     atomicity_dir="os/aix"
 206     atomic_word_dir="os/aix"
 207     ;;
 208   aix*)
 209     os_include_dir="os/generic"
 210     atomicity_dir="cpu/generic"
 211     ;;
 212   bsd*)
 213     # Plain BSD attempts to share FreeBSD files.
 214     os_include_dir="os/bsd/freebsd"
 215     ;;
 216   cygwin*)
 217     os_include_dir="os/newlib"
 218     OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
 219     ;;
 220   darwin | darwin[1-7] | darwin[1-7].*)
 221     # On Darwin, performance is improved if libstdc++ is single-module.
 222     # Up to at least 10.3.7, -flat_namespace is required for proper
 223     # treatment of coalesced symbols.
 224     OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module -Wl,-flat_namespace"
 225     os_include_dir="os/bsd/darwin"
 226     ;;
 227   darwin[89] | darwin[89].* | darwin[1-9][0-9]* )
 228     # On Darwin, performance is improved if libstdc++ is single-module,
 229     # and on 8+ compatibility is better if not -flat_namespace.
 230     OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module"
 231     case "${host_cpu}" in
 232       i[34567]86 | x86_64)
 233         OPTIMIZE_CXXFLAGS="${OPTIMIZE_CXXFLAGS} -fvisibility-inlines-hidden"
 234         ;;
 235     esac
 236     os_include_dir="os/bsd/darwin"
 237     ;;
 238   *djgpp*)      # leading * picks up "msdosdjgpp"
 239     os_include_dir="os/djgpp"
 240     error_constants_dir="os/djgpp"
 241     ;;
 242   freebsd*)
 243     os_include_dir="os/bsd/freebsd"
 244     ;;
 245   gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
 246     if [ "$uclibc" = "yes" ]; then
 247       os_include_dir="os/uclibc"
 248     elif [ "$bionic" = "yes" ]; then
 249       os_include_dir="os/bionic"
 250     else
 251       os_include_dir="os/gnu-linux"
 252     fi
 253     ;;
 254   hpux*)
 255     os_include_dir="os/hpux"
 256     ;;
 257   irix6.5*)
 258     os_include_dir="os/irix/irix6.5"
 259     atomicity_dir=os/irix
 260     atomic_word_dir=os/irix
 261     # libstdc++.so relies on emutls on IRIX, which only works with the
 262     # real functions implemented in libpthread.so, not with the stubs in
 263     # libc, so always pass -lpthread.
 264     OPT_LDFLAGS="${OPT_LDFLAGS} -lpthread"
 265     ;;
 266   mingw32*)
 267     case "$host" in
 268       *-w64-*)
 269         os_include_dir="os/mingw32-w64"
 270         error_constants_dir="os/mingw32-w64"
 271         ;;
 272       *)
 273         os_include_dir="os/mingw32"
 274         error_constants_dir="os/mingw32"
 275         ;;
 276     esac
 277     OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
 278     ;;
 279   netbsd*)
 280     os_include_dir="os/bsd/netbsd"
 281     ;;
 282   osf*)
 283     os_include_dir="os/generic"
 284     # libstdc++.so relies on emutls on Tru64 UNIX, which only works with the
 285     # real functions implemented in libpthread.so, not with the dummies in
 286     # libgcc, so always pass -lpthread.
 287     OPT_LDFLAGS="${OPT_LDFLAGS} -lpthread"
 288     ;;
 289   qnx6.[12]*)
 290     os_include_dir="os/qnx/qnx6.1"
 291     c_model=c
 292     ;;
 293   solaris2)
 294     # This too-vague configuration does not provide enough information
 295     # to select a ctype include, and thus os_include_dir is a crap shoot.
 296     echo "Please specify the full version of Solaris, ie. solaris2.9 " 1>&2
 297     exit 1
 298     ;;
 299   solaris2.[89] | solaris2.1[0-9])
 300     os_include_dir="os/solaris/solaris2.8"
 301     ;;
 302   tpf)
 303     os_include_dir="os/tpf"
 304     ;;
 305   vxworks)
 306     os_include_dir="os/vxworks"
 307     ;;
 308   *)
 309     os_include_dir="os/generic"
 310     ;;
 311 esac
 312
 313
 314 # Set any OS-dependent and CPU-dependent bits.
 315 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 316 case "${host}" in
 317   *-*-linux*)
 318     case "${host_cpu}" in
 319       i[567]86)
 320         abi_baseline_pair=i486-linux-gnu
 321         ;;
 322       mips64*)
 323         abi_baseline_pair=mips64-linux-gnu
 324         ;;
 325       powerpc64)
 326         abi_baseline_pair=powerpc64-linux-gnu
 327         ;;
 328       s390)
 329         abi_baseline_pair=s390-linux-gnu
 330         ;;
 331       s390x)
 332         abi_baseline_pair=s390x-linux-gnu
 333         ;;
 334       x86_64)
 335         abi_baseline_pair=x86_64-linux-gnu
 336         ;;
 337       *)
 338         if test -d ${glibcxx_srcdir}/config/abi/post/${try_cpu}-linux-gnu; then
 339           abi_baseline_pair=${try_cpu}-linux-gnu
 340         fi
 341     esac
 342     case "${host}" in
 343       arm*-*-linux-*eabi)
 344         port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
 345         ;;
 346     esac
 347     ;;
 348   powerpc*-*-darwin*)
 349     port_specific_symbol_files="\$(srcdir)/../config/os/bsd/darwin/ppc-extra.ver"
 350     ;;
 351   *-*-solaris2.[89])
 352     abi_baseline_pair=solaris2.8
 353     abi_baseline_subdir_switch=--print-multi-os-directory
 354     ;;
 355   *-*-solaris2.1[0-9])
 356     abi_baseline_pair=solaris2.10
 357     abi_baseline_subdir_switch=--print-multi-os-directory
 358     ;;
 359 esac