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 #
  46 #   error_constants_dir    location of error_constants.h
  47 #                          defaults to os/generic.
  48 #
  49 # It possibly modifies the following variables:
  50 #
  51 #   OPT_LDFLAGS            extra flags to pass when linking the library, of
  52 #                          the form '-Wl,blah'
  53 #                          (defaults to empty in acinclude.m4)
  54 #
  55 #   port_specific_symbol_files
  56 #                          whitespace-seperated list of files containing
  57 #                          additional symbols to export from the shared
  58 #                          library, when symbol versioning is in use
  59 #
  60 #
  61 # If the defaults will not work for your platform, you need only change the
  62 # variables that won't work, i.e., you do not need to explicitly set a
  63 # working variable to its default.  Most hosts only need to change the two
  64 # *_include_dir variables.
  65
  66
  67 # DEFAULTS
  68 # Try to guess a default cpu_include_dir based on the name of the CPU.  We
  69 # cannot do this for os_include_dir; there are too many portable operating
  70 # systems out there.  :-)
  71 c_model=c_global
  72 c_compatibility=no
  73 atomic_word_dir=cpu/generic
  74 atomicity_dir="cpu/generic"
  75 cpu_defines_dir="cpu/generic"
  76 try_cpu=generic
  77 abi_tweaks_dir="cpu/generic"
  78 error_constants_dir="os/generic"
  79
  80 # HOST-SPECIFIC OVERRIDES
  81 # Set any CPU-dependent bits.
  82
  83 # Provide a way to funnel exotic flavors and prefixed/postfixed chip
  84 # variants into the established source config/cpu/* sub-directories.
  85 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
  86 case "${host_cpu}" in
  87   alpha*)
  88     try_cpu=alpha
  89     ;;
  90   arm* | xscale | ep9312)
  91     try_cpu=arm
  92     ;;
  93   i[567]86 | x86_64)
  94     try_cpu=i486
  95     ;;
  96   hppa*)
  97     try_cpu=hppa
  98     ;;
  99   mips*)
 100     try_cpu=mips
 101     ;;
 102   m680[246]0)
 103     try_cpu=m68k
 104     ;;
 105   powerpc* | rs6000)
 106     try_cpu=powerpc
 107     ;;
 108   sparc* | ultrasparc)
 109     try_cpu=sparc
 110     ;;
 111   *)
 112     if test -d ${glibcxx_srcdir}/config/cpu/${host_cpu}; then
 113       try_cpu=${host_cpu}
 114     fi
 115 esac
 116
 117
 118 # Now look for the file(s) usually tied to a CPU model, and make
 119 # default choices for those if they haven't been explicitly set
 120 # already.
 121 cpu_include_dir=cpu/${try_cpu}
 122
 123
 124 # Set specific CPU overrides for cpu_defines_dir. Most can just use generic.
 125 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 126 case "${host_cpu}" in
 127   powerpc* | rs6000)
 128     cpu_defines_dir=cpu/powerpc
 129     ;;
 130 esac
 131
 132
 133 # Set specific CPU overrides for atomic_word_dir. Most can just use generic.
 134 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 135 case "${host_cpu}" in
 136   alpha*)
 137     atomic_word_dir=cpu/alpha
 138     ;;
 139   cris*)
 140     atomic_word_dir=cpu/cris
 141     ;;
 142   ia64)
 143     atomic_word_dir=cpu/ia64
 144     ;;
 145   powerpc* | rs6000)
 146     atomic_word_dir=cpu/powerpc
 147     ;;
 148   sparc* | ultrasparc)
 149     atomic_word_dir=cpu/sparc
 150     ;;
 151 esac
 152
 153
 154 # Set specific CPU overrides for atomicity_dir.
 155 # This can be over-ridden in GLIBCXX_ENABLE_ATOMIC_BUILTINS.
 156 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 157 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/atomicity.h ; then
 158   atomicity_dir=$cpu_include_dir
 159 fi
 160
 161
 162 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/cxxabi_tweaks.h ; then
 163   abi_tweaks_dir=$cpu_include_dir
 164 fi
 165
 166
 167 # Set any OS-dependent bits.
 168 # Set the os_include_dir.
 169 # Set the error_costants_dir.
 170 # Set c_model, c_compatibility here.
 171 # If atomic ops and/or numeric limits are OS-specific rather than
 172 # CPU-specifc, set those here too.
 173 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 174 case "${host_os}" in
 175   aix4.[3456789]* | aix[56789]*)
 176     # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
 177     # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
 178     # explicitly duplicate the directory for 4.[<3].
 179     os_include_dir="os/aix"
 180     atomicity_dir="os/aix"
 181     atomic_word_dir="os/aix"
 182     OPT_LDFLAGS="-Wl,-G"
 183     ;;
 184   aix4.*)
 185     os_include_dir="os/generic"
 186     atomicity_dir="os/aix"
 187     atomic_word_dir="os/aix"
 188     ;;
 189   aix*)
 190     os_include_dir="os/generic"
 191     atomicity_dir="cpu/generic"
 192     ;;
 193   bsd*)
 194     # Plain BSD attempts to share FreeBSD files.
 195     os_include_dir="os/bsd/freebsd"
 196     ;;
 197   cygwin*)
 198     os_include_dir="os/newlib"
 199     ;;
 200   darwin | darwin[1-7] | darwin[1-7].*)
 201     # On Darwin, performance is improved if libstdc++ is single-module.
 202     # Up to at least 10.3.7, -flat_namespace is required for proper
 203     # treatment of coalesced symbols.
 204     OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module -Wl,-flat_namespace"
 205     os_include_dir="os/bsd/darwin"
 206     ;;
 207   darwin[89] | darwin[89].* | darwin[1-9][0-9]* )
 208     # On Darwin, performance is improved if libstdc++ is single-module,
 209     # and on 8+ compatibility is better if not -flat_namespace.
 210     OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module"
 211     case "${host_cpu}" in
 212       i[34567]86 | x86_64)
 213         OPTIMIZE_CXXFLAGS="${OPTIMIZE_CXXFLAGS} -fvisibility-inlines-hidden"
 214         ;;
 215     esac
 216     os_include_dir="os/bsd/darwin"
 217     ;;
 218   *djgpp*)      # leading * picks up "msdosdjgpp"
 219     os_include_dir="os/djgpp"
 220     ;;
 221   freebsd*)
 222     os_include_dir="os/bsd/freebsd"
 223     ;;
 224   gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
 225     if [ "$uclibc" = "yes" ]; then
 226       os_include_dir="os/uclibc"
 227     else
 228       os_include_dir="os/gnu-linux"
 229     fi
 230     ;;
 231   hpux*)
 232     os_include_dir="os/hpux"
 233     ;;
 234   irix[1-6] | irix[1-5].* | irix6.[0-4]*)
 235     # This is known to work on at least IRIX 5.2 and 6.3.
 236     os_include_dir="os/irix/irix5.2"
 237     atomicity_dir=os/irix
 238     atomic_word_dir=os/irix
 239     ;;
 240   irix6.5*)
 241     os_include_dir="os/irix/irix6.5"
 242     atomicity_dir=os/irix
 243     atomic_word_dir=os/irix
 244     ;;
 245   mingw32*)
 246     os_include_dir="os/mingw32"
 247     error_constants_dir="os/mingw32"
 248     ;;
 249   netbsd*)
 250     os_include_dir="os/bsd/netbsd"
 251     ;;
 252   qnx6.[12]*)
 253     os_include_dir="os/qnx/qnx6.1"
 254     c_model=c
 255     ;;
 256   solaris2)
 257     # This too-vague configuration does not provide enough information
 258     # to select a ctype include, and thus os_include_dir is a crap shoot.
 259     echo "Please specify the full version of Solaris, ie. solaris2.9 " 1>&2
 260     exit 1
 261     ;;
 262   solaris2.5 | solaris2.5.[0-9])
 263     os_include_dir="os/solaris/solaris2.5"
 264     ;;
 265   solaris2.6)
 266     os_include_dir="os/solaris/solaris2.6"
 267     ;;
 268   solaris2.[789] | solaris2.1[0-9])
 269     os_include_dir="os/solaris/solaris2.7"
 270     ;;
 271   tpf)
 272     os_include_dir="os/tpf"
 273     ;;
 274   vxworks)
 275     os_include_dir="os/vxworks"
 276     ;;
 277   windiss*)
 278     os_include_dir="os/windiss"
 279     ;;
 280   *)
 281     os_include_dir="os/generic"
 282     ;;
 283 esac
 284
 285
 286 # Set any OS-dependent and CPU-dependent bits.
 287 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 288 case "${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=${try_cpu}-linux-gnu
 309         fi
 310     esac
 311     ;;
 312   mips*-*-*)
 313     case "${host_os}" in
 314       gnu* | linux* | irix*)
 315         ;;
 316       *)
 317         atomicity_dir="cpu/generic"
 318         ;;
 319     esac
 320     ;;
 321   powerpc*-*-darwin*)
 322     port_specific_symbol_files="\$(srcdir)/../config/os/bsd/darwin/ppc-extra.ver"
 323     ;;
 324 esac