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 #
  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 if test -d ${glibcpp_srcdir}/config/cpu/${target_cpu}; then
  54     cpu_include_dir="cpu/${target_cpu}"
  55 else
  56     cpu_include_dir="cpu/generic"
  57 fi
  58
  59 abi_baseline_triplet=${target}
  60
  61 c_model=c_std
  62 c_compatibility=no
  63
  64
  65 # TARGET-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 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
  70 case "${target_cpu}" in
  71   alpha*)
  72     cpu_include_dir="cpu/alpha"
  73     ;;
  74   arm* | strongarm* | xscale* )
  75     cpu_include_dir="cpu/arm"
  76     ;;
  77   i486 | i586 | i686 | i786)
  78     # add athlons here maybe
  79     cpu_include_dir="cpu/i486"
  80     ;;
  81   m68k | m680[246]0)
  82     cpu_include_dir="cpu/m68k"
  83     ;;
  84   mips*)
  85     # MIPS chips are unreliable as to sc/ll support. By default
  86     # don't use atomic instructions and override for the OS.
  87     cpu_include_dir="cpu/generic"
  88     ;;
  89   mmix)
  90     ATOMICITYH="cpu/generic"
  91     ;;
  92   powerpc* | rs6000)
  93     cpu_include_dir="cpu/powerpc"
  94     ;;
  95   s390 | s390x)
  96     cpu_include_dir="cpu/s390"
  97     ;;
  98   sparc* | ultrasparc)
  99     cpu_include_dir="cpu/sparc"
 100     ;;
 101   x86_64*)
 102     cpu_include_dir="cpu/x86-64"
 103     ;;
 104 esac
 105
 106
 107 # Now look for the file(s) usually tied to a CPU model, and make default
 108 # choices for those if they haven't been explicitly set already.
 109 _cpu_incdir_fullpath=${glibcpp_srcdir}/config/${cpu_include_dir}
 110 if test x${ATOMICITYH+set} != xset; then
 111   if test -f ${_cpu_incdir_fullpath}/atomicity.h; then
 112     ATOMICITYH=$cpu_include_dir
 113   else
 114     ATOMICITYH="cpu/generic"
 115   fi
 116 fi
 117 unset _cpu_incdir_fullpath
 118
 119
 120 # Set any OS-dependent bits.
 121 # Set the os_include_dir.
 122 # Set c_model, c_compatibility here.
 123 # If atomic ops and/or numeric limits are OS-specific rather than
 124 # CPU-specifc, set those here too.
 125 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 126 case "${target_os}" in
 127   aix4.[3456789]* | aix[56789]*)
 128     # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
 129     # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
 130     # explicitly duplicate the directory for 4.[<3].
 131     os_include_dir="os/aix"
 132     ATOMICITYH="os/aix"
 133     OPT_LDFLAGS="-Wl,-G"
 134     ;;
 135   aix4.*)
 136     ATOMICITYH="os/aix"
 137     ;;
 138   aix*)
 139     ATOMICITYH="cpu/generic"
 140     ;;
 141   bsd* | freebsd* )
 142     os_include_dir="os/bsd/freebsd"
 143     ;;
 144   cygwin*)
 145     os_include_dir="os/newlib"
 146     ;;
 147   *djgpp*)      # leading * picks up "msdosdjgpp"
 148     os_include_dir="os/djgpp"
 149     ;;
 150   gnu* | linux*)
 151     os_include_dir="os/gnu-linux"
 152     ;;
 153   hpux*)
 154     os_include_dir="os/hpux"
 155     ;;
 156   irix[1-6] | irix[1-5].* | irix6.[0-4]*)
 157     # This is known to work on at least IRIX 5.2 and 6.3.
 158     os_include_dir="os/irix/irix5.2"
 159     ATOMICITYH=$os_include_dir
 160     ;;
 161   irix6.5*)
 162     os_include_dir="os/irix/irix6.5"
 163     ATOMICITYH=$os_include_dir
 164     ;;
 165   mingw32*)
 166     os_include_dir="os/mingw32"
 167     ;;
 168   netbsd*)
 169     os_include_dir="os/bsd/netbsd"
 170     ;;
 171   solaris2.5*)
 172     os_include_dir="os/solaris/solaris2.5"
 173     ;;
 174   solaris2.6*)
 175     os_include_dir="os/solaris/solaris2.6"
 176     ;;
 177   solaris2.[78]*)
 178     os_include_dir="os/solaris/solaris2.7"
 179     ;;
 180   windiss*)
 181     os_include_dir="os/windiss"
 182     ;;
 183   qnx6.[12]*)
 184     os_include_dir="os/qnx/qnx6.1"
 185     c_model=c
 186     ;;
 187   *)
 188     os_include_dir="os/generic"
 189     ;;
 190 esac
 191
 192
 193 # Set any OS-dependent and CPU-dependent bits.
 194 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 195 case "${target}" in
 196   mips*-*-linux*)
 197     ATOMICITYH="cpu/mips"
 198     ;;
 199 esac