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   alpha*)
 160     atomic_word_dir=cpu/alpha
 161     ;;
 162   cris*)
 163     atomic_word_dir=cpu/cris
 164     ;;
 165   ia64)
 166     atomic_word_dir=cpu/ia64
 167     ;;
 168   i[4567]86 | x86_64)
 169     atomic_flags="-march=native"
 170     ;;
 171   powerpc* | rs6000)
 172     atomic_word_dir=cpu/powerpc
 173     ;;
 174   sparc* | ultrasparc)
 175     atomic_word_dir=cpu/sparc
 176     atomic_flags="-mcpu=v9"
 177     ;;
 178 esac
 179
 180
 181 # Set specific CPU overrides for atomicity_dir.
 182 # This can be over-ridden in GLIBCXX_ENABLE_ATOMIC_BUILTINS.
 183 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 184 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/atomicity.h ; then
 185   atomicity_dir=$cpu_include_dir
 186 fi
 187
 188
 189 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/cxxabi_tweaks.h ; then
 190   abi_tweaks_dir=$cpu_include_dir
 191 fi
 192
 193
 194 # Set directory with CPU-specific optimization
 195 cpu_opt_dir=${cpu_include_dir}/opt
 196 test -d ${glibcxx_srcdir}/config/${cpu_include_dir}/opt ||
 197 cpu_opt_dir=cpu/generic/opt
 198 # For each header with CPU-specific optimizations check whether it
 199 # exists in ${cpu_opt_dir}.  If not, point the variable at the
 200 # appropriate file in the generic directory.
 201 cpu_opt_ext_random=${cpu_opt_dir}/ext/opt_random.h
 202 test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} ||
 203 cpu_opt_ext_random=cpu/generic/opt/ext/opt_random.h
 204
 205 cpu_opt_bits_random=${cpu_opt_dir}/bits/opt_random.h
 206 test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} ||
 207 cpu_opt_ext_random=cpu/generic/opt/bits/opt_random.h
 208
 209
 210 # Set any OS-dependent bits.
 211 # Set the os_include_dir.
 212 # Set the error_costants_dir.
 213 # Set c_model, c_compatibility here.
 214 # If atomic ops and/or numeric limits are OS-specific rather than
 215 # CPU-specifc, set those here too.
 216 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 217 case "${host_os}" in
 218   aix[56789]*)
 219     # Newer versions of AIX only support PowerPC architecture, so use
 220     # atomic instructions directly.
 221     os_include_dir="os/aix"
 222     atomic_word_dir="os/aix"
 223     ;;
 224   aix4.[3456789]*)
 225     # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
 226     # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
 227     # explicitly duplicate the directory for 4.[<3].
 228     os_include_dir="os/aix"
 229     atomicity_dir="os/aix"
 230     atomic_word_dir="os/aix"
 231     ;;
 232   aix4.*)
 233     os_include_dir="os/generic"
 234     atomicity_dir="os/aix"
 235     atomic_word_dir="os/aix"
 236     ;;
 237   aix*)
 238     os_include_dir="os/generic"
 239     atomicity_dir="cpu/generic"
 240     ;;
 241   bsd*)
 242     # Plain BSD attempts to share FreeBSD files.
 243     os_include_dir="os/bsd/freebsd"
 244     ;;
 245   cygwin*)
 246     os_include_dir="os/newlib"
 247     OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
 248     ;;
 249   darwin | darwin[1-7] | darwin[1-7].*)
 250     # On Darwin, performance is improved if libstdc++ is single-module.
 251     # Up to at least 10.3.7, -flat_namespace is required for proper
 252     # treatment of coalesced symbols.
 253     OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module -Wl,-flat_namespace"
 254     os_include_dir="os/bsd/darwin"
 255     ;;
 256   darwin[89] | darwin[89].* | darwin[1-9][0-9]* )
 257     # On Darwin, performance is improved if libstdc++ is single-module,
 258     # and on 8+ compatibility is better if not -flat_namespace.
 259     OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module"
 260     case "${host_cpu}" in
 261       i[34567]86 | x86_64)
 262         OPTIMIZE_CXXFLAGS="${OPTIMIZE_CXXFLAGS} -fvisibility-inlines-hidden"
 263         ;;
 264     esac
 265     os_include_dir="os/bsd/darwin"
 266     ;;
 267   *djgpp*)      # leading * picks up "msdosdjgpp"
 268     os_include_dir="os/djgpp"
 269     error_constants_dir="os/djgpp"
 270     ;;
 271   dragonfly*)
 272     os_include_dir="os/bsd/dragonfly"
 273     ;;
 274   freebsd*)
 275     os_include_dir="os/bsd/freebsd"
 276     ;;
 277   linux-musl*)
 278     os_include_dir="os/generic"
 279     ;;
 280   gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
 281     if [ "$uclibc" = "yes" ]; then
 282       os_include_dir="os/uclibc"
 283     elif [ "$bionic" = "yes" ]; then
 284       os_include_dir="os/bionic"
 285     else
 286       os_include_dir="os/gnu-linux"
 287     fi
 288     ;;
 289   hpux*)
 290     os_include_dir="os/hpux"
 291     ;;
 292   mingw32*)
 293     case "$host" in
 294       *-w64-*)
 295         os_include_dir="os/mingw32-w64"
 296         error_constants_dir="os/mingw32-w64"
 297         ;;
 298       *)
 299         os_include_dir="os/mingw32"
 300         error_constants_dir="os/mingw32"
 301         ;;
 302     esac
 303     OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
 304     ;;
 305   netbsd*)
 306     os_include_dir="os/bsd/netbsd"
 307     ;;
 308   openbsd*)
 309     os_include_dir="os/bsd/openbsd"
 310     ;;
 311   qnx6.[12]*)
 312     os_include_dir="os/qnx/qnx6.1"
 313     c_model=c
 314     ;;
 315   solaris2)
 316     # This too-vague configuration does not provide enough information
 317     # to select a ctype include, and thus os_include_dir is a crap shoot.
 318     echo "Please specify the full version of Solaris, ie. solaris2.10 " 1>&2
 319     exit 1
 320     ;;
 321   solaris2.1[0-9])
 322     os_include_dir="os/solaris/solaris2.10"
 323     ;;
 324   tpf)
 325     os_include_dir="os/tpf"
 326     ;;
 327   vxworks)
 328     os_include_dir="os/vxworks"
 329     ;;
 330   *)
 331     os_include_dir="os/generic"
 332     ;;
 333 esac
 334
 335
 336 # Set any OS-dependent and CPU-dependent bits.
 337 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 338 case "${host}" in
 339   *-*-linux*)
 340     case "${host_cpu}" in
 341       i[567]86)
 342         abi_baseline_pair=i486-linux-gnu
 343         ;;
 344       mips64*)
 345         abi_baseline_pair=mips64-linux-gnu
 346         ;;
 347       powerpc64*)
 348         abi_baseline_pair=powerpc64-linux-gnu
 349         ;;
 350       s390)
 351         abi_baseline_pair=s390-linux-gnu
 352         ;;
 353       s390x)
 354         abi_baseline_pair=s390x-linux-gnu
 355         ;;
 356       x86_64)
 357         abi_baseline_pair=x86_64-linux-gnu
 358         ;;
 359       *)
 360         if test $try_cpu = generic; then
 361           try_abi_cpu=$host_cpu
 362         else
 363           try_abi_cpu=$try_cpu
 364         fi
 365         if test -d ${glibcxx_srcdir}/config/abi/post/${try_abi_cpu}-linux-gnu; then
 366           abi_baseline_pair=${try_abi_cpu}-linux-gnu
 367         fi
 368     esac
 369     case "${host}" in
 370       arm*-*-linux-*)
 371         port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
 372         ;;
 373     esac
 374     ;;
 375   arm*-*-freebsd*)
 376      port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
 377      ;;
 378   powerpc*-*-darwin*)
 379     port_specific_symbol_files="\$(srcdir)/../config/os/bsd/darwin/ppc-extra.ver"
 380     ;;
 381   *-*-solaris2.1[0-9])
 382     abi_baseline_pair=solaris2.10
 383     abi_baseline_subdir_switch=--print-multi-os-directory
 384     ;;
 385 esac