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
  21 #                          used to set atomicity_include_dir.
  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 #   atomicity_dir          location of atomicity.h,
  34 #                          defaults to cpu_include_dir
  35 #
  36 #   atomic_word_dir        location of atomic_word.h
  37 #                          defaults to generic.
  38 #
  39 # It possibly modifies the following variables:
  40 #
  41 #   OPT_LDFLAGS            extra flags to pass when linking the library, of
  42 #                          the form '-Wl,blah'
  43 #                          (defaults to empty in acinclude.m4)
  44 #
  45 #   port_specific_symbol_files
  46 #                          whitespace-seperated list of files containing
  47 #                          additional symbols to export from the shared
  48 #                          library, when symbol versioning is in use
  49 #
  50 #
  51 # If the defaults will not work for your platform, you need only change the
  52 # variables that won't work, i.e., you do not need to explicitly set a
  53 # working variable to its default.  Most hosts only need to change the two
  54 # *_include_dir variables.
  55
  56
  57 # DEFAULTS
  58 # Try to guess a default cpu_include_dir based on the name of the CPU.  We
  59 # cannot do this for os_include_dir; there are too many portable operating
  60 # systems out there.  :-)
  61 c_model=c_std
  62 c_compatibility=no
  63 atomic_word_dir=cpu/generic
  64
  65 # HOST-SPECIFIC OVERRIDES
  66 # Set any CPU-dependent bits.
  67 # Here we override defaults and catch more general cases due to naming
  68 # conventions (e.g., chip_name* to catch all variants).
  69
  70 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
  71 case "${host_cpu}" in
  72   alpha*)
  73     try_cpu=alpha
  74     ;;
  75   i[567]86 | x86_64)
  76     try_cpu=i486
  77     ;;
  78   hppa*)
  79     try_cpu=hppa
  80     ;;
  81   mips*)
  82     # NB: cpu/mips/atomicity.h needs MIPS II or above.
  83     # Of course, there is no sane way to test for this, no ABI macro,
  84     # and no consistent host_cpu name differentiation. Therefore, only
  85     # use it where it is known to be safe, ie it runs linux (see below).
  86     try_cpu=generic
  87     ;;
  88   m680[246]0)
  89     try_cpu=m68k
  90     ;;
  91   powerpc* | rs6000)
  92     try_cpu=powerpc
  93     ;;
  94   s390x)
  95     try_cpu=s390
  96     ;;
  97   sparc* | ultrasparc)
  98     try_cpu=sparc
  99     ;;
 100   arm* | xscale | ep9312)
 101     try_cpu=arm
 102     ;;
 103   *)
 104     if test -d ${glibcxx_srcdir}/config/cpu/${host_cpu}; then
 105       try_cpu=${host_cpu}
 106     else
 107       try_cpu=generic
 108     fi
 109     ;;
 110 esac
 111
 112 # Set specific CPU overrides for atomic_word_dir. Most can just use generic.
 113 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 114 case "${host_cpu}" in
 115   cris*)
 116     atomic_word_dir=cpu/cris
 117     ;;
 118   sparc* | ultrasparc)
 119     atomic_word_dir=cpu/sparc
 120     ;;
 121 esac
 122
 123 # Now look for the file(s) usually tied to a CPU model, and make
 124 # default choices for those if they haven't been explicitly set
 125 # already.
 126 cpu_include_dir="cpu/${try_cpu}"
 127 abi_baseline_pair=${try_cpu}-${host_os}
 128
 129 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/atomicity.h ; then
 130   atomicity_dir=$cpu_include_dir
 131 else
 132   atomicity_dir="cpu/generic"
 133 fi
 134
 135 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/cxxabi_tweaks.h ; then
 136   abi_tweaks_dir=$cpu_include_dir
 137 else
 138   abi_tweaks_dir="cpu/generic"
 139 fi
 140
 141 # Set any OS-dependent bits.
 142 # Set the os_include_dir.
 143 # Set c_model, c_compatibility here.
 144 # If atomic ops and/or numeric limits are OS-specific rather than
 145 # CPU-specifc, set those here too.
 146 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 147 case "${host_os}" in
 148   aix4.[3456789]* | aix[56789]*)
 149     # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
 150     # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
 151     # explicitly duplicate the directory for 4.[<3].
 152     os_include_dir="os/aix"
 153     atomicity_dir="os/aix"
 154     OPT_LDFLAGS="-Wl,-G"
 155     ;;
 156   aix4.*)
 157     os_include_dir="os/generic"
 158     atomicity_dir="os/aix"
 159     ;;
 160   aix*)
 161     os_include_dir="os/generic"
 162     atomicity_dir="cpu/generic"
 163     ;;
 164   bsd*)
 165     # Plain BSD attempts to share FreeBSD files.
 166     os_include_dir="os/bsd/freebsd"
 167     ;;
 168   cygwin*)
 169     os_include_dir="os/newlib"
 170     ;;
 171   *djgpp*)      # leading * picks up "msdosdjgpp"
 172     os_include_dir="os/djgpp"
 173     ;;
 174   freebsd*)
 175     os_include_dir="os/bsd/freebsd"
 176     ;;
 177   gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
 178     os_include_dir="os/gnu-linux"
 179     ;;
 180   hpux*)
 181     os_include_dir="os/hpux"
 182     ;;
 183   irix[1-6] | irix[1-5].* | irix6.[0-4]*)
 184     # This is known to work on at least IRIX 5.2 and 6.3.
 185     os_include_dir="os/irix/irix5.2"
 186     atomicity_dir=os/irix
 187     atomic_word_dir=os/irix
 188     ;;
 189   irix6.5*)
 190     os_include_dir="os/irix/irix6.5"
 191     atomicity_dir=os/irix
 192     atomic_word_dir=os/irix
 193     ;;
 194   mingw32*)
 195     os_include_dir="os/mingw32"
 196     ;;
 197   netbsd*)
 198     os_include_dir="os/bsd/netbsd"
 199     ;;
 200   qnx6.[12]*)
 201     os_include_dir="os/qnx/qnx6.1"
 202     c_model=c
 203     ;;
 204   solaris2)
 205     # This too-vague configuration does not provide enough information
 206     # to select a ctype include, and thus os_include_dir is a crap shoot.
 207     echo "Please specify the full version of Solaris, ie. solaris2.9 " 1>&2
 208     exit 1;
 209     ;;
 210   solaris2.5 | solaris2.5.[0-9])
 211     os_include_dir="os/solaris/solaris2.5"
 212     ;;
 213   solaris2.6)
 214     os_include_dir="os/solaris/solaris2.6"
 215     ;;
 216   solaris2.[789] | solaris2.1[0-9])
 217     os_include_dir="os/solaris/solaris2.7"
 218     ;;
 219   tpf)
 220     os_include_dir="os/tpf"
 221     ;;
 222   vxworks)
 223     os_include_dir="os/vxworks"
 224     ;;
 225   windiss*)
 226     os_include_dir="os/windiss"
 227     ;;
 228   *)
 229     os_include_dir="os/generic"
 230     ;;
 231 esac
 232
 233
 234 # Set any OS-dependent and CPU-dependent bits.
 235 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 236 case "${host}" in
 237   mips*-*-linux*)
 238     atomicity_dir="cpu/mips"
 239     ;;
 240   x86_64-*-linux*)
 241     abi_baseline_pair="x86_64-linux-gnu"
 242     ;;
 243   alpha*-*-freebsd5*)
 244     abi_baseline_pair="alpha-freebsd5"
 245     ;;
 246   i*86-*-freebsd4*)
 247     abi_baseline_pair="i386-freebsd4"
 248     ;;
 249   i*86-*-freebsd5*)
 250     abi_baseline_pair="i386-freebsd5"
 251     ;;
 252   sparc*-*-freebsd5*)
 253     abi_baseline_pair="sparc-freebsd5"
 254     ;;
 255 esac