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 #   cpu_defines_dir        location of cpu_defines.h
  43 #                          defaults to generic.
  44 #
  45 # It possibly modifies the following variables:
  46 #
  47 #   OPT_LDFLAGS            extra flags to pass when linking the library, of
  48 #                          the form '-Wl,blah'
  49 #                          (defaults to empty in acinclude.m4)
  50 #
  51 #   port_specific_symbol_files
  52 #                          whitespace-seperated list of files containing
  53 #                          additional symbols to export from the shared
  54 #                          library, when symbol versioning is in use
  55 #
  56 #
  57 # If the defaults will not work for your platform, you need only change the
  58 # variables that won't work, i.e., you do not need to explicitly set a
  59 # working variable to its default.  Most hosts only need to change the two
  60 # *_include_dir variables.
  61
  62
  63 # DEFAULTS
  64 # Try to guess a default cpu_include_dir based on the name of the CPU.  We
  65 # cannot do this for os_include_dir; there are too many portable operating
  66 # systems out there.  :-)
  67 c_model=c_global
  68 c_compatibility=no
  69 atomic_word_dir=cpu/generic
  70 atomicity_dir="cpu/generic"
  71 cpu_defines_dir="cpu/generic"
  72 try_cpu=generic
  73 abi_tweaks_dir="cpu/generic"
  74
  75 # HOST-SPECIFIC OVERRIDES
  76 # Set any CPU-dependent bits.
  77
  78 # Provide a way to funnel exotic flavors and prefixed/postfixed chip
  79 # variants into the established source config/cpu/* sub-directories.
  80 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
  81 case "${host_cpu}" in
  82   alpha*)
  83     try_cpu=alpha
  84     ;;
  85   arm* | xscale | ep9312)
  86     try_cpu=arm
  87     ;;
  88   i[567]86 | x86_64)
  89     try_cpu=i486
  90     ;;
  91   hppa*)
  92     try_cpu=hppa
  93     ;;
  94   mips*)
  95     try_cpu=mips
  96     ;;
  97   m680[246]0)
  98     try_cpu=m68k
  99     ;;
 100   powerpc* | rs6000)
 101     try_cpu=powerpc
 102     ;;
 103   sparc* | ultrasparc)
 104     try_cpu=sparc
 105     ;;
 106   *)
 107     if test -d ${glibcxx_srcdir}/config/cpu/${host_cpu}; then
 108       try_cpu=${host_cpu}
 109     fi
 110 esac
 111
 112
 113 # Now look for the file(s) usually tied to a CPU model, and make
 114 # default choices for those if they haven't been explicitly set
 115 # already.
 116 cpu_include_dir=cpu/${try_cpu}
 117
 118
 119 # Set specific CPU overrides for cpu_defines_dir. Most can just use generic.
 120 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 121 case "${host_cpu}" in
 122   powerpc* | rs6000)
 123     cpu_defines_dir=cpu/powerpc
 124     ;;
 125 esac
 126
 127
 128 # Set specific CPU overrides for atomic_word_dir. Most can just use generic.
 129 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 130 case "${host_cpu}" in
 131   alpha*)
 132     atomic_word_dir=cpu/alpha
 133     ;;
 134   cris*)
 135     atomic_word_dir=cpu/cris
 136     ;;
 137   ia64)
 138     atomic_word_dir=cpu/ia64
 139     ;;
 140   powerpc* | rs6000)
 141     atomic_word_dir=cpu/powerpc
 142     ;;
 143   sparc* | ultrasparc)
 144     atomic_word_dir=cpu/sparc
 145     ;;
 146 esac
 147
 148
 149 # Set specific CPU overrides for atomicity_dir.
 150 # This can be over-ridden in GLIBCXX_ENABLE_ATOMIC_BUILTINS.
 151 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 152 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/atomicity.h ; then
 153   atomicity_dir=$cpu_include_dir
 154 fi
 155
 156
 157 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/cxxabi_tweaks.h ; then
 158   abi_tweaks_dir=$cpu_include_dir
 159 fi
 160
 161
 162 # Set any OS-dependent bits.
 163 # Set the os_include_dir.
 164 # Set c_model, c_compatibility here.
 165 # If atomic ops and/or numeric limits are OS-specific rather than
 166 # CPU-specifc, set those here too.
 167 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 168 case "${host_os}" in
 169   aix4.[3456789]* | aix[56789]*)
 170     # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
 171     # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
 172     # explicitly duplicate the directory for 4.[<3].
 173     os_include_dir="os/aix"
 174     atomicity_dir="os/aix"
 175     atomic_word_dir="os/aix"
 176     OPT_LDFLAGS="-Wl,-G"
 177     ;;
 178   aix4.*)
 179     os_include_dir="os/generic"
 180     atomicity_dir="os/aix"
 181     atomic_word_dir="os/aix"
 182     ;;
 183   aix*)
 184     os_include_dir="os/generic"
 185     atomicity_dir="cpu/generic"
 186     ;;
 187   bsd*)
 188     # Plain BSD attempts to share FreeBSD files.
 189     os_include_dir="os/bsd/freebsd"
 190     ;;
 191   cygwin*)
 192     os_include_dir="os/newlib"
 193     ;;
 194   darwin | darwin[1-7] | darwin[1-7].*)
 195     # On Darwin, performance is improved if libstdc++ is single-module.
 196     # Up to at least 10.3.7, -flat_namespace is required for proper
 197     # treatment of coalesced symbols.
 198     OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module -Wl,-flat_namespace"
 199     os_include_dir="os/bsd/darwin"
 200     ;;
 201   darwin[89] | darwin[89].* | darwin[1-9][0-9]* )
 202     # On Darwin, performance is improved if libstdc++ is single-module,
 203     # and on 8+ compatibility is better if not -flat_namespace.
 204     OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module"
 205     case "${host_cpu}" in
 206       i[34567]86 | x86_64)
 207         OPTIMIZE_CXXFLAGS="${OPTIMIZE_CXXFLAGS} -fvisibility-inlines-hidden"
 208         ;;
 209     esac
 210     os_include_dir="os/bsd/darwin"
 211     ;;
 212   *djgpp*)      # leading * picks up "msdosdjgpp"
 213     os_include_dir="os/djgpp"
 214     ;;
 215   freebsd*)
 216     os_include_dir="os/bsd/freebsd"
 217     ;;
 218   gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
 219     if [ "$uclibc" = "yes" ]; then
 220       os_include_dir="os/uclibc"
 221     else
 222       os_include_dir="os/gnu-linux"
 223     fi
 224     ;;
 225   hpux*)
 226     os_include_dir="os/hpux"
 227     ;;
 228   irix[1-6] | irix[1-5].* | irix6.[0-4]*)
 229     # This is known to work on at least IRIX 5.2 and 6.3.
 230     os_include_dir="os/irix/irix5.2"
 231     atomicity_dir=os/irix
 232     atomic_word_dir=os/irix
 233     ;;
 234   irix6.5*)
 235     os_include_dir="os/irix/irix6.5"
 236     atomicity_dir=os/irix
 237     atomic_word_dir=os/irix
 238     ;;
 239   mingw32*)
 240     os_include_dir="os/mingw32"
 241     ;;
 242   netbsd*)
 243     os_include_dir="os/bsd/netbsd"
 244     ;;
 245   qnx6.[12]*)
 246     os_include_dir="os/qnx/qnx6.1"
 247     c_model=c
 248     ;;
 249   solaris2)
 250     # This too-vague configuration does not provide enough information
 251     # to select a ctype include, and thus os_include_dir is a crap shoot.
 252     echo "Please specify the full version of Solaris, ie. solaris2.9 " 1>&2
 253     exit 1
 254     ;;
 255   solaris2.5 | solaris2.5.[0-9])
 256     os_include_dir="os/solaris/solaris2.5"
 257     ;;
 258   solaris2.6)
 259     os_include_dir="os/solaris/solaris2.6"
 260     ;;
 261   solaris2.[789] | solaris2.1[0-9])
 262     os_include_dir="os/solaris/solaris2.7"
 263     ;;
 264   tpf)
 265     os_include_dir="os/tpf"
 266     ;;
 267   vxworks)
 268     os_include_dir="os/vxworks"
 269     ;;
 270   windiss*)
 271     os_include_dir="os/windiss"
 272     ;;
 273   *)
 274     os_include_dir="os/generic"
 275     ;;
 276 esac
 277
 278
 279 # Set any OS-dependent and CPU-dependent bits.
 280 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 281 case "${host}" in
 282   *-*-linux*)
 283     case "${host_cpu}" in
 284       i[567]86)
 285         abi_baseline_pair=i486-linux-gnu
 286         ;;
 287       powerpc64)
 288         abi_baseline_pair=powerpc64-linux-gnu
 289         ;;
 290       s390)
 291         abi_baseline_pair=s390-linux-gnu
 292         ;;
 293       s390x)
 294         abi_baseline_pair=s390x-linux-gnu
 295         ;;
 296       x86_64)
 297         abi_baseline_pair=x86_64-linux-gnu
 298         ;;
 299       *)
 300         if test -d ${glibcxx_srcdir}/config/abi/post/${try_cpu}-linux-gnu; then
 301           abi_baseline_pair=${try_cpu}-linux-gnu
 302         fi
 303     esac
 304     ;;
 305   mips*-*-*)
 306     case "${host_os}" in
 307       gnu* | linux* | irix*)
 308         ;;
 309       *)
 310         atomicity_dir="cpu/generic"
 311         ;;
 312     esac
 313     ;;
 314   powerpc*-*-darwin*)
 315     port_specific_symbol_files="\$(srcdir)/../config/os/bsd/darwin/ppc-extra.ver"
 316     ;;
 317 esac