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_tweaks_dir         location of cxxabi_tweaks.h,
  34 #                          defaults to cpu_include_dir
  35 #
  36 #   atomicity_dir          location of atomicity.h,
  37 #                          defaults to cpu_include_dir
  38 #
  39 #   atomic_word_dir        location of atomic_word.h
  40 #                          defaults to generic.
  41 #
  42 #   atomic_flags           extra flags to pass to use atomic instructions
  43 #                          defaults to nothing.
  44 #
  45 #   cpu_defines_dir        location of cpu_defines.h
  46 #                          defaults to generic.
  47 #
  48 #
  49 #   error_constants_dir    location of error_constants.h
  50 #                          defaults to os/generic.
  51 #
  52 # It possibly modifies the following variables:
  53 #
  54 #   OPT_LDFLAGS            extra flags to pass when linking the library, of
  55 #                          the form '-Wl,blah'
  56 #                          (defaults to empty in acinclude.m4)
  57 #
  58 #   port_specific_symbol_files
  59 #                          whitespace-seperated list of files containing
  60 #                          additional symbols to export from the shared
  61 #                          library, when symbol versioning is in use
  62 #
  63 #
  64 # If the defaults will not work for your platform, you need only change the
  65 # variables that won't work, i.e., you do not need to explicitly set a
  66 # working variable to its default.  Most hosts only need to change the two
  67 # *_include_dir variables.
  68
  69
  70 # DEFAULTS
  71 # Try to guess a default cpu_include_dir based on the name of the CPU.  We
  72 # cannot do this for os_include_dir; there are too many portable operating
  73 # systems out there.  :-)
  74 c_model=c_global
  75 c_compatibility=no
  76 atomic_word_dir=cpu/generic
  77 atomic_flags=""
  78 atomicity_dir="cpu/generic"
  79 cpu_defines_dir="cpu/generic"
  80 try_cpu=generic
  81 abi_tweaks_dir="cpu/generic"
  82 error_constants_dir="os/generic"
  83
  84 # HOST-SPECIFIC OVERRIDES
  85 # Set any CPU-dependent bits.
  86
  87 # Provide a way to funnel exotic flavors and prefixed/postfixed chip
  88 # variants into the established source config/cpu/* sub-directories.
  89 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
  90 case "${host_cpu}" in
  91   alpha*)
  92     try_cpu=alpha
  93     ;;
  94   arm*)
  95     try_cpu=arm
  96     ;;
  97   crisv32)
  98     try_cpu=cris
  99     ;;
 100   i[567]86 | x86_64)
 101     try_cpu=i486
 102     ;;
 103   hppa*)
 104     try_cpu=hppa
 105     ;;
 106   mips*)
 107     try_cpu=mips
 108     ;;
 109   powerpc* | rs6000)
 110     try_cpu=powerpc
 111     ;;
 112   sparc* | ultrasparc)
 113     try_cpu=sparc
 114     ;;
 115   *)
 116     if test -d ${glibcxx_srcdir}/config/cpu/${host_cpu}; then
 117       try_cpu=${host_cpu}
 118     fi
 119 esac
 120
 121
 122 # Now look for the file(s) usually tied to a CPU model, and make
 123 # default choices for those if they haven't been explicitly set
 124 # already.
 125 cpu_include_dir=cpu/${try_cpu}
 126
 127
 128 # Set specific CPU overrides for cpu_defines_dir. Most can just use generic.
 129 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 130 case "${host_cpu}" in
 131   powerpc* | rs6000)
 132     cpu_defines_dir=cpu/powerpc
 133     ;;
 134 esac
 135
 136
 137 # Set specific CPU overrides for atomic_word_dir and atomic_flags.
 138 # Most can just use generic.
 139 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 140 case "${host_cpu}" in
 141   alpha*)
 142     atomic_word_dir=cpu/alpha
 143     ;;
 144   cris*)
 145     atomic_word_dir=cpu/cris
 146     ;;
 147   ia64)
 148     atomic_word_dir=cpu/ia64
 149     ;;
 150   i[4567]86 | x86_64)
 151     atomic_flags="-march=native"
 152     ;;
 153   powerpc* | rs6000)
 154     atomic_word_dir=cpu/powerpc
 155     ;;
 156   sparc* | ultrasparc)
 157     atomic_word_dir=cpu/sparc
 158     atomic_flags="-mcpu=v9"
 159     ;;
 160 esac
 161
 162
 163 # Set specific CPU overrides for atomicity_dir.
 164 # This can be over-ridden in GLIBCXX_ENABLE_ATOMIC_BUILTINS.
 165 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 166 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/atomicity.h ; then
 167   atomicity_dir=$cpu_include_dir
 168 fi
 169
 170
 171 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/cxxabi_tweaks.h ; then
 172   abi_tweaks_dir=$cpu_include_dir
 173 fi
 174
 175
 176 # Set any OS-dependent bits.
 177 # Set the os_include_dir.
 178 # Set the error_costants_dir.
 179 # Set c_model, c_compatibility here.
 180 # If atomic ops and/or numeric limits are OS-specific rather than
 181 # CPU-specifc, set those here too.
 182 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 183 case "${host_os}" in
 184   aix4.[3456789]* | aix[56789]*)
 185     # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
 186     # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
 187     # explicitly duplicate the directory for 4.[<3].
 188     os_include_dir="os/aix"
 189     atomicity_dir="os/aix"
 190     atomic_word_dir="os/aix"
 191     OPT_LDFLAGS="-Wl,-G"
 192     ;;
 193   aix4.*)
 194     os_include_dir="os/generic"
 195     atomicity_dir="os/aix"
 196     atomic_word_dir="os/aix"
 197     ;;
 198   aix*)
 199     os_include_dir="os/generic"
 200     atomicity_dir="cpu/generic"
 201     ;;
 202   bsd*)
 203     # Plain BSD attempts to share FreeBSD files.
 204     os_include_dir="os/bsd/freebsd"
 205     ;;
 206   cygwin*)
 207     os_include_dir="os/newlib"
 208     ;;
 209   darwin | darwin[1-7] | darwin[1-7].*)
 210     # On Darwin, performance is improved if libstdc++ is single-module.
 211     # Up to at least 10.3.7, -flat_namespace is required for proper
 212     # treatment of coalesced symbols.
 213     OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module -Wl,-flat_namespace"
 214     os_include_dir="os/bsd/darwin"
 215     ;;
 216   darwin[89] | darwin[89].* | darwin[1-9][0-9]* )
 217     # On Darwin, performance is improved if libstdc++ is single-module,
 218     # and on 8+ compatibility is better if not -flat_namespace.
 219     OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module"
 220     case "${host_cpu}" in
 221       i[34567]86 | x86_64)
 222         OPTIMIZE_CXXFLAGS="${OPTIMIZE_CXXFLAGS} -fvisibility-inlines-hidden"
 223         ;;
 224     esac
 225     os_include_dir="os/bsd/darwin"
 226     ;;
 227   *djgpp*)      # leading * picks up "msdosdjgpp"
 228     os_include_dir="os/djgpp"
 229     ;;
 230   freebsd*)
 231     os_include_dir="os/bsd/freebsd"
 232     ;;
 233   gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
 234     if [ "$uclibc" = "yes" ]; then
 235       os_include_dir="os/uclibc"
 236     else
 237       os_include_dir="os/gnu-linux"
 238     fi
 239     ;;
 240   hpux*)
 241     os_include_dir="os/hpux"
 242     ;;
 243   irix[1-6] | irix[1-5].* | irix6.[0-4]*)
 244     # This is known to work on at least IRIX 5.2 and 6.3.
 245     os_include_dir="os/irix/irix5.2"
 246     atomicity_dir=os/irix
 247     atomic_word_dir=os/irix
 248     ;;
 249   irix6.5*)
 250     os_include_dir="os/irix/irix6.5"
 251     atomicity_dir=os/irix
 252     atomic_word_dir=os/irix
 253     ;;
 254   mingw32*)
 255     os_include_dir="os/mingw32"
 256     error_constants_dir="os/mingw32"
 257     ;;
 258   netbsd*)
 259     os_include_dir="os/bsd/netbsd"
 260     ;;
 261   qnx6.[12]*)
 262     os_include_dir="os/qnx/qnx6.1"
 263     c_model=c
 264     ;;
 265   solaris2)
 266     # This too-vague configuration does not provide enough information
 267     # to select a ctype include, and thus os_include_dir is a crap shoot.
 268     echo "Please specify the full version of Solaris, ie. solaris2.9 " 1>&2
 269     exit 1
 270     ;;
 271   solaris2.[789] | solaris2.1[0-9])
 272     os_include_dir="os/solaris/solaris2.7"
 273     ;;
 274   tpf)
 275     os_include_dir="os/tpf"
 276     ;;
 277   vxworks)
 278     os_include_dir="os/vxworks"
 279     ;;
 280   *)
 281     os_include_dir="os/generic"
 282     ;;
 283 esac
 284
 285
 286 # Set any OS-dependent and CPU-dependent bits.
 287 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 288 case "${host}" in
 289   *-*-linux*)
 290     case "${host_cpu}" in
 291       i[567]86)
 292         abi_baseline_pair=i486-linux-gnu
 293         ;;
 294       powerpc64)
 295         abi_baseline_pair=powerpc64-linux-gnu
 296         ;;
 297       s390)
 298         abi_baseline_pair=s390-linux-gnu
 299         ;;
 300       s390x)
 301         abi_baseline_pair=s390x-linux-gnu
 302         ;;
 303       x86_64)
 304         abi_baseline_pair=x86_64-linux-gnu
 305         ;;
 306       *)
 307         if test -d ${glibcxx_srcdir}/config/abi/post/${try_cpu}-linux-gnu; then
 308           abi_baseline_pair=${try_cpu}-linux-gnu
 309         fi
 310     esac
 311     case "${host}" in
 312       arm*-*-linux-*eabi)
 313         port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
 314         ;;
 315     esac
 316     ;;
 317   powerpc*-*-darwin*)
 318     port_specific_symbol_files="\$(srcdir)/../config/os/bsd/darwin/ppc-extra.ver"
 319     ;;
 320 esac