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 ATOMICITYH.
  22 #
  23 #   os_include_dir         OS-specific directory, defaults to os/generic.
  24 #
  25 #   c_model                the model to use for "C" headers, defaults to c_std.
  26 #
  27 #   c_compatibility        if "C" compatibility headers are necessary,
  28 #                              defaults to no.
  29 #
  30 #   abi_baseline_triplet   directory name for ABI compat testing,
  31 #                              defaults to target (as per config.guess)
  32 #
  33 #   ATOMICITYH             location of atomicity.h,
  34 #                              defaults to cpu_include_dir
  35 #
  36 # It possibly modifies the following variables:
  37 #
  38 #   OPT_LDFLAGS            extra flags to pass when linking the library, of
  39 #                              the form '-Wl,blah'
  40 #                              (defaults to empty in acinclude.m4)
  41 #
  42 #
  43 # If the defaults will not work for your platform, you need only change the
  44 # variables that won't work, i.e., you do not need to explicitly set a
  45 # working variable to its default.  Most targets only need to change the two
  46 # *_include_dir variables.
  47
  48
  49 # DEFAULTS
  50 # Try to guess a default cpu_include_dir based on the name of the CPU.  We
  51 # cannot do this for os_include_dir; there are too many portable operating
  52 # systems out there.  :-)
  53 abi_baseline_triplet=${target}
  54 c_model=c_std
  55 c_compatibility=no
  56 if test -d ${glibcpp_srcdir}/config/cpu/${target_cpu}; then
  57     cpu_include_dir="cpu/${target_cpu}"
  58 else
  59     cpu_include_dir="cpu/generic"
  60 fi
  61
  62
  63 # TARGET-SPECIFIC OVERRIDES
  64 # Set any CPU-dependent bits.
  65 # Here we override defaults and catch more general cases due to naming
  66 # conventions (e.g., chip_name* to catch all variants).
  67 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
  68 case "${target_cpu}" in
  69   alpha*)
  70     cpu_include_dir="cpu/alpha"
  71     ;;
  72   athlon* | i586 | i686 | i786 | x86_64)
  73     cpu_include_dir="cpu/i486"
  74     ;;
  75   hppa*)
  76     cpu_include_dir="cpu/hppa"
  77     ;;
  78   m680[246]0)
  79     cpu_include_dir="cpu/m68k"
  80     ;;
  81   powerpc* | rs6000)
  82     cpu_include_dir="cpu/powerpc"
  83     ;;
  84   s390x)
  85     cpu_include_dir="cpu/s390"
  86     ;;
  87   sparc* | ultrasparc)
  88     cpu_include_dir="cpu/sparc"
  89     ;;
  90 esac
  91
  92
  93 # Now look for the file(s) usually tied to a CPU model, and make default
  94 # choices for those if they haven't been explicitly set already.
  95 _cpu_incdir_fullpath=${glibcpp_srcdir}/config/${cpu_include_dir}
  96 if test x${ATOMICITYH+set} != xset; then
  97   if test -f ${_cpu_incdir_fullpath}/atomicity.h; then
  98     ATOMICITYH=$cpu_include_dir
  99   else
 100     ATOMICITYH="cpu/generic"
 101   fi
 102 fi
 103 unset _cpu_incdir_fullpath
 104
 105
 106 # Set any OS-dependent bits.
 107 # Set the os_include_dir.
 108 # Set c_model, c_compatibility here.
 109 # If atomic ops and/or numeric limits are OS-specific rather than
 110 # CPU-specifc, set those here too.
 111 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 112 case "${target_os}" in
 113   aix4.[3456789]* | aix[56789]*)
 114     # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
 115     # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
 116     # explicitly duplicate the directory for 4.[<3].
 117     os_include_dir="os/aix"
 118     ATOMICITYH="os/aix"
 119     OPT_LDFLAGS="-Wl,-G"
 120     ;;
 121   aix4.*)
 122     ATOMICITYH="os/aix"
 123     ;;
 124   aix*)
 125     ATOMICITYH="cpu/generic"
 126     ;;
 127   bsd*)
 128     # Plain BSD attempts to share FreeBSD files.
 129     os_include_dir="os/bsd/freebsd"
 130     ;;
 131   cygwin*)
 132     os_include_dir="os/newlib"
 133     ;;
 134   *djgpp*)      # leading * picks up "msdosdjgpp"
 135     os_include_dir="os/djgpp"
 136     ;;
 137   freebsd*)
 138     os_include_dir="os/bsd/freebsd"
 139     # The FreeBSD ABI is expressed in the major version number only.
 140     abi_baseline_triplet=`echo ${target} | sed 's,\(\.[0-9]*\)*$,,'`
 141     ;;
 142   gnu* | linux*)
 143     os_include_dir="os/gnu-linux"
 144     ;;
 145   hpux*)
 146     os_include_dir="os/hpux"
 147     ;;
 148   irix[1-6] | irix[1-5].* | irix6.[0-4]*)
 149     # This is known to work on at least IRIX 5.2 and 6.3.
 150     os_include_dir="os/irix/irix5.2"
 151     ATOMICITYH=$os_include_dir
 152     ;;
 153   irix6.5*)
 154     os_include_dir="os/irix/irix6.5"
 155     ATOMICITYH=$os_include_dir
 156     ;;
 157   mingw32*)
 158     os_include_dir="os/mingw32"
 159     ;;
 160   netbsd*)
 161     os_include_dir="os/bsd/netbsd"
 162     ;;
 163   solaris2.5*)
 164     os_include_dir="os/solaris/solaris2.5"
 165     ;;
 166   solaris2.6*)
 167     os_include_dir="os/solaris/solaris2.6"
 168     ;;
 169   solaris2.[78]*)
 170     os_include_dir="os/solaris/solaris2.7"
 171     ;;
 172   windiss*)
 173     os_include_dir="os/windiss"
 174     ;;
 175   qnx6.[12]*)
 176     os_include_dir="os/qnx/qnx6.1"
 177     c_model=c
 178     ;;
 179   *)
 180     os_include_dir="os/generic"
 181     ;;
 182 esac
 183
 184
 185 # Set any OS-dependent and CPU-dependent bits.
 186 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 187 case "${target}" in
 188   mips*-*-linux*)
 189     ATOMICITYH="cpu/mips"
 190     ;;
 191 esac