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_std.
  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 # It possibly modifies the following variables:
  43 #
  44 #   OPT_LDFLAGS            extra flags to pass when linking the library, of
  45 #                          the form '-Wl,blah'
  46 #                          (defaults to empty in acinclude.m4)
  47 #
  48 #   port_specific_symbol_files
  49 #                          whitespace-seperated list of files containing
  50 #                          additional symbols to export from the shared
  51 #                          library, when symbol versioning is in use
  52 #
  53 #
  54 # If the defaults will not work for your platform, you need only change the
  55 # variables that won't work, i.e., you do not need to explicitly set a
  56 # working variable to its default.  Most hosts only need to change the two
  57 # *_include_dir variables.
  58
  59
  60 # DEFAULTS
  61 # Try to guess a default cpu_include_dir based on the name of the CPU.  We
  62 # cannot do this for os_include_dir; there are too many portable operating
  63 # systems out there.  :-)
  64 c_model=c_std
  65 c_compatibility=no
  66 atomic_word_dir=cpu/generic
  67
  68 # HOST-SPECIFIC OVERRIDES
  69 # Set any CPU-dependent bits.
  70 # Here we override defaults and catch more general cases due to naming
  71 # conventions (e.g., chip_name* to catch all variants).
  72
  73 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
  74 case "${host_cpu}" in
  75   alpha*)
  76     try_cpu=alpha
  77     ;;
  78   arm* | xscale | ep9312)
  79     try_cpu=arm
  80     ;;
  81   i[567]86 | x86_64)
  82     try_cpu=i486
  83     ;;
  84   hppa*)
  85     try_cpu=hppa
  86     ;;
  87   mips*)
  88     # NB: cpu/mips/atomicity.h needs MIPS II or above.
  89     # Of course, there is no sane way to test for this, no ABI macro,
  90     # and no consistent host_cpu name differentiation. Therefore, only
  91     # use it where it is known to be safe, ie it runs linux (see below).
  92     try_cpu=generic
  93     ;;
  94   m680[246]0)
  95     try_cpu=m68k
  96     ;;
  97   powerpc* | rs6000)
  98     try_cpu=powerpc
  99     ;;
 100   s390x)
 101     try_cpu=s390
 102     ;;
 103   sparc* | ultrasparc)
 104     try_cpu=sparc
 105     ;;
 106   *)
 107     if test -d ${glibcxx_srcdir}/config/cpu/${host_cpu}; then
 108       try_cpu=${host_cpu}
 109     else
 110       try_cpu=generic
 111     fi
 112     ;;
 113 esac
 114
 115 # Set specific CPU overrides for atomic_word_dir. Most can just use generic.
 116 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 117 case "${host_cpu}" in
 118   cris*)
 119     atomic_word_dir=cpu/cris
 120     ;;
 121   sparc* | ultrasparc)
 122     atomic_word_dir=cpu/sparc
 123     ;;
 124 esac
 125
 126 # Now look for the file(s) usually tied to a CPU model, and make
 127 # default choices for those if they haven't been explicitly set
 128 # already.
 129 cpu_include_dir=cpu/${try_cpu}
 130 abi_baseline_pair=${try_cpu}-${host_os}
 131 unset try_cpu
 132
 133 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/atomicity.h ; then
 134   atomicity_dir=$cpu_include_dir
 135 else
 136   atomicity_dir="cpu/generic"
 137 fi
 138
 139 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/cxxabi_tweaks.h ; then
 140   abi_tweaks_dir=$cpu_include_dir
 141 else
 142   abi_tweaks_dir="cpu/generic"
 143 fi
 144
 145 # Set any OS-dependent bits.
 146 # Set the os_include_dir.
 147 # Set c_model, c_compatibility here.
 148 # If atomic ops and/or numeric limits are OS-specific rather than
 149 # CPU-specifc, set those here too.
 150 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 151 case "${host_os}" in
 152   aix4.[3456789]* | aix[56789]*)
 153     # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
 154     # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
 155     # explicitly duplicate the directory for 4.[<3].
 156     os_include_dir="os/aix"
 157     atomicity_dir="os/aix"
 158     OPT_LDFLAGS="-Wl,-G"
 159     ;;
 160   aix4.*)
 161     os_include_dir="os/generic"
 162     atomicity_dir="os/aix"
 163     ;;
 164   aix*)
 165     os_include_dir="os/generic"
 166     atomicity_dir="cpu/generic"
 167     ;;
 168   bsd*)
 169     # Plain BSD attempts to share FreeBSD files.
 170     os_include_dir="os/bsd/freebsd"
 171     ;;
 172   cygwin*)
 173     os_include_dir="os/newlib"
 174     ;;
 175   darwin*)
 176     # On Darwin, performance is improved if libstdc++ is single-module.
 177     # Up to at least 10.3.5, -flat_namespace is required for proper
 178     # treatment of coalesced symbols.
 179     OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module -Wl,-flat_namespace"
 180     os_include_dir="os/bsd/darwin"
 181     ;;
 182   *djgpp*)      # leading * picks up "msdosdjgpp"
 183     os_include_dir="os/djgpp"
 184     ;;
 185   freebsd*)
 186     os_include_dir="os/bsd/freebsd"
 187     ;;
 188   gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
 189     os_include_dir="os/gnu-linux"
 190     ;;
 191   hpux*)
 192     os_include_dir="os/hpux"
 193     ;;
 194   irix[1-6] | irix[1-5].* | irix6.[0-4]*)
 195     # This is known to work on at least IRIX 5.2 and 6.3.
 196     os_include_dir="os/irix/irix5.2"
 197     atomicity_dir=os/irix
 198     atomic_word_dir=os/irix
 199     ;;
 200   irix6.5*)
 201     os_include_dir="os/irix/irix6.5"
 202     atomicity_dir=os/irix
 203     atomic_word_dir=os/irix
 204     ;;
 205   mingw32*)
 206     os_include_dir="os/mingw32"
 207     ;;
 208   netbsd*)
 209     os_include_dir="os/bsd/netbsd"
 210     ;;
 211   qnx6.[12]*)
 212     os_include_dir="os/qnx/qnx6.1"
 213     c_model=c
 214     ;;
 215   solaris2)
 216     # This too-vague configuration does not provide enough information
 217     # to select a ctype include, and thus os_include_dir is a crap shoot.
 218     echo "Please specify the full version of Solaris, ie. solaris2.9 " 1>&2
 219     exit 1
 220     ;;
 221   solaris2.5 | solaris2.5.[0-9])
 222     os_include_dir="os/solaris/solaris2.5"
 223     ;;
 224   solaris2.6)
 225     os_include_dir="os/solaris/solaris2.6"
 226     ;;
 227   solaris2.[789] | solaris2.1[0-9])
 228     os_include_dir="os/solaris/solaris2.7"
 229     ;;
 230   tpf)
 231     os_include_dir="os/tpf"
 232     ;;
 233   vxworks)
 234     os_include_dir="os/vxworks"
 235     ;;
 236   windiss*)
 237     os_include_dir="os/windiss"
 238     ;;
 239   *)
 240     os_include_dir="os/generic"
 241     ;;
 242 esac
 243
 244
 245 # Set any OS-dependent and CPU-dependent bits.
 246 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 247 case "${host}" in
 248   alpha*-*-freebsd5*)
 249     abi_baseline_pair="alpha-freebsd5"
 250     ;;
 251   arm*-*-linux*)
 252     abi_baseline_pair="arm-linux-gnu"
 253     ;;
 254   i*86-*-freebsd4*)
 255     abi_baseline_pair="i386-freebsd4"
 256     ;;
 257   i*86-*-freebsd5*)
 258     abi_baseline_pair="i386-freebsd5"
 259     ;;
 260   mips*-*-linux*)
 261     atomicity_dir="cpu/mips"
 262     abi_baseline_pair="mips-linux-gnu"
 263     cpu_include_dir="cpu/mips"
 264     ;;
 265   s390-*-linux*)
 266     abi_baseline_pair="s390-linux-gnu"
 267     ;;
 268   s390x-*-linux*)
 269     abi_baseline_pair="s390x-linux-gnu"
 270     ;;
 271   sparc*-*-freebsd5*)
 272     abi_baseline_pair="sparc-freebsd5"
 273     ;;
 274   x86_64-*-linux*)
 275     abi_baseline_pair="x86_64-linux-gnu"
 276     ;;
 277 esac