libstdc++-v3/configure.target

   1 # configure.target
   2 #
   3 # This shell script handles all target based configuration for libstdc++.
   4 # It sets various shell variables based on the the target 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 #   target                The configuration target (full CPU-vendor-OS triplet)
  13 #   target_cpu            The configuration target CPU
  14 #   target_os             The configuration target 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/target_cpu doesn't exist.  This is
  21 #                              used to set the next two:
  22 #   ATOMICITYH             location of atomicity.h,
  23 #                              defaults to cpu_include_dir
  24 #   CPULIMITSH             location of cpu_limits.h,
  25 #                              defaults to cpu_include_dir
  26 #
  27 #   os_include_dir         OS-specific directory, defaults to os/generic.
  28 #
  29 #   c_model                the model to use for "C" headers, defaults to c_std.
  30 #
  31 #   c_compatibility        if "C" compatibility headers are necessary,
  32 #                              defaults to no.
  33 #
  34 #   abi_baseline_triplet   directory name for ABI compat testing,
  35 #                              defaults to target (as per config.guess)
  36 #
  37 # It possibly modifies the following variables:
  38 #
  39 #   OPT_LDFLAGS            extra flags to pass when linking the library, of
  40 #                              the form '-Wl,blah'
  41 #                              (defaults to empty in acinclude.m4)
  42 #
  43 #
  44 # If the defaults will not work for your platform, you need only change the
  45 # variables that won't work, i.e., you do not need to explicitly set a
  46 # working variable to its default.  Most targets only need to change the two
  47 # *_include_dir variables.
  48
  49
  50 # DEFAULTS
  51 # Try to guess a default cpu_include_dir based on the name of the CPU.  We
  52 # cannot do this for os_include_dir; there are too many portable operating
  53 # systems out there.  :-)
  54 if test -d ${glibcpp_srcdir}/config/cpu/${target_cpu}; then
  55     cpu_include_dir="cpu/${target_cpu}"
  56 else
  57     cpu_include_dir="cpu/generic"
  58 fi
  59
  60 abi_baseline_triplet=${target}
  61
  62 c_model=c_std
  63 c_compatibility=no
  64
  65
  66 # TARGET-SPECIFIC OVERRIDES
  67 # Set any CPU-dependent bits.
  68 # Here we override defaults and catch more general cases due to naming
  69 # conventions (e.g., chip_name* to catch all variants).
  70 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
  71 case "${target_cpu}" in
  72   alpha*)
  73     cpu_include_dir="cpu/alpha"
  74     ;;
  75   arm*)
  76     cpu_include_dir="cpu/arm"
  77     ;;
  78   i486 | i586 | i686 | i786)
  79     # add athlons here maybe
  80     cpu_include_dir="cpu/i486"
  81     CPULIMITSH="cpu/i386"
  82     ;;
  83   m68k | m680[246]0)
  84     cpu_include_dir="cpu/m68k"
  85     ;;
  86   mips*)
  87     # MIPS chips are unreliable as to sc/ll support. By default
  88     # don't use atomic instructions and override for the OS.
  89     cpu_include_dir="cpu/generic"
  90     ;;
  91   mmix)
  92     ATOMICITYH="cpu/generic"
  93     ;;
  94   powerpc* | rs6000)
  95     cpu_include_dir="cpu/powerpc"
  96     ;;
  97   s390 | s390x)
  98     cpu_include_dir="cpu/s390"
  99     ;;
 100   sparc64 | ultrasparc)
 101     cpu_include_dir="cpu/sparc/sparc64"
 102     ;;
 103   sparc*)
 104     cpu_include_dir="cpu/sparc/sparc32"
 105     ;;
 106   x86_64*)
 107     cpu_include_dir="cpu/x86-64"
 108     ;;
 109 esac
 110
 111
 112 # Now look for the two files usually tied to a CPU model, and make default
 113 # choices for those if they haven't been explicitly set already.
 114 _cpu_incdir_fullpath=${glibcpp_srcdir}/config/${cpu_include_dir}
 115 if test x${ATOMICITYH+set} != xset; then
 116   if test -f ${_cpu_incdir_fullpath}/atomicity.h; then
 117     ATOMICITYH=$cpu_include_dir
 118   else
 119     ATOMICITYH="cpu/generic"
 120   fi
 121 fi
 122 if test x${CPULIMITSH+set} != xset; then
 123   if test -f ${_cpu_incdir_fullpath}/cpu_limits.h; then
 124     CPULIMITSH=$cpu_include_dir
 125   else
 126     CPULIMITSH="cpu/generic"
 127   fi
 128 fi
 129 unset _cpu_incdir_fullpath
 130
 131
 132 # Set any OS-dependent bits.
 133 # Set the os_include_dir.
 134 # Set c_model, c_compatibility here.
 135 # If atomic ops and/or numeric limits are OS-specific rather than
 136 # CPU-specifc, set those here too.
 137 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 138 case "${target_os}" in
 139   aix4.[3456789]* | aix[56789]*)
 140     # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
 141     # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
 142     # explicitly duplicate the directory for 4.[<3].
 143     os_include_dir="os/aix"
 144     ATOMICITYH="os/aix"
 145     OPT_LDFLAGS="-Wl,-G"
 146     ;;
 147   aix4.*)
 148     ATOMICITYH="os/aix"
 149     ;;
 150   aix*)
 151     ATOMICITYH="cpu/generic"
 152     ;;
 153   bsd* | freebsd* )
 154     os_include_dir="os/bsd/freebsd"
 155     ;;
 156   cygwin*)
 157     os_include_dir="os/newlib"
 158     ;;
 159   *djgpp*)      # leading * picks up "msdosdjgpp"
 160     os_include_dir="os/djgpp"
 161     ;;
 162   gnu* | linux*)
 163     os_include_dir="os/gnu-linux"
 164     ;;
 165   hpux*)
 166     os_include_dir="os/hpux"
 167     CPULIMITSH="os/hpux"
 168     ;;
 169   irix[1-6] | irix[1-5].* | irix6.[0-4]*)
 170     # This is known to work on at least IRIX 5.2 and 6.3.
 171     os_include_dir="os/irix/irix5.2"
 172     ATOMICITYH=$os_include_dir
 173     ;;
 174   irix6.5*)
 175     os_include_dir="os/irix/irix6.5"
 176     ATOMICITYH=$os_include_dir
 177     ;;
 178   mingw32*)
 179     os_include_dir="os/mingw32"
 180     ;;
 181   netbsd*)
 182     os_include_dir="os/bsd/netbsd"
 183     ;;
 184   solaris2.5*)
 185     os_include_dir="os/solaris/solaris2.5"
 186     ;;
 187   solaris2.6*)
 188     os_include_dir="os/solaris/solaris2.6"
 189     ;;
 190   solaris2.[78]*)
 191     os_include_dir="os/solaris/solaris2.7"
 192     ;;
 193   windiss*)
 194     os_include_dir="os/windiss"
 195     ;;
 196   qnx6.[12]*)
 197     os_include_dir="os/qnx/qnx6.1"
 198     c_model=c
 199     ;;
 200   *)
 201     os_include_dir="os/generic"
 202     ;;
 203 esac
 204
 205
 206 # Set any OS-dependent and CPU-dependent bits.
 207 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 208 case "${target}" in
 209   alpha*-*-*osf5*)
 210     CPULIMITSH="os/osf/osf5.0"
 211     ;;
 212   mips*-*-linux*)
 213     ATOMICITYH="cpu/mips"
 214     ;;
 215 esac