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 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 host (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 hosts 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=${host}
  54 c_model=c_std
  55 c_compatibility=no
  56 if test -d ${glibcpp_srcdir}/config/cpu/${host_cpu}; then
  57     cpu_include_dir="cpu/${host_cpu}"
  58 else
  59     cpu_include_dir="cpu/generic"
  60 fi
  61
  62
  63 # HOST-SPECIFIC OVERRIDES
  64 # Set any CPU-dependent bits.
  65 # Here we override defaults and catch more general cases due to naming
  66 # conventions (e.g., chip_name* to catch all variants).
  67 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
  68 case "${host_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   mips*)
  79     # cpu/mips/atomicity.h needs MIPS II or above.  Only use it
  80     # where it is known to be safe.
  81     ATOMICITYH="cpu/generic"
  82     ;;
  83   m680[246]0)
  84     cpu_include_dir="cpu/m68k"
  85     ;;
  86   powerpc* | rs6000)
  87     cpu_include_dir="cpu/powerpc"
  88     ;;
  89   s390x)
  90     cpu_include_dir="cpu/s390"
  91     ;;
  92   sparc* | ultrasparc)
  93     cpu_include_dir="cpu/sparc"
  94     ;;
  95 esac
  96
  97
  98 # Now look for the file(s) usually tied to a CPU model, and make default
  99 # choices for those if they haven't been explicitly set already.
 100 _cpu_incdir_fullpath=${glibcpp_srcdir}/config/${cpu_include_dir}
 101 if test x${ATOMICITYH+set} != xset; then
 102   if test -f ${_cpu_incdir_fullpath}/atomicity.h; then
 103     ATOMICITYH=$cpu_include_dir
 104   else
 105     ATOMICITYH="cpu/generic"
 106   fi
 107 fi
 108 unset _cpu_incdir_fullpath
 109
 110
 111 # Set any OS-dependent bits.
 112 # Set the os_include_dir.
 113 # Set c_model, c_compatibility here.
 114 # If atomic ops and/or numeric limits are OS-specific rather than
 115 # CPU-specifc, set those here too.
 116 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 117 case "${host_os}" in
 118   aix4.[3456789]* | aix[56789]*)
 119     # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
 120     # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
 121     # explicitly duplicate the directory for 4.[<3].
 122     os_include_dir="os/aix"
 123     ATOMICITYH="os/aix"
 124     OPT_LDFLAGS="-Wl,-G"
 125     ;;
 126   aix4.*)
 127     ATOMICITYH="os/aix"
 128     ;;
 129   aix*)
 130     ATOMICITYH="cpu/generic"
 131     ;;
 132   bsd*)
 133     # Plain BSD attempts to share FreeBSD files.
 134     os_include_dir="os/bsd/freebsd"
 135     ;;
 136   cygwin*)
 137     os_include_dir="os/newlib"
 138     ;;
 139   *djgpp*)      # leading * picks up "msdosdjgpp"
 140     os_include_dir="os/djgpp"
 141     ;;
 142   freebsd*)
 143     os_include_dir="os/bsd/freebsd"
 144     # The FreeBSD ABI is expressed in the major version number only.
 145     abi_baseline_triplet=`echo ${host} | sed 's,\(\.[0-9]*\)*$,,'`
 146     ;;
 147   gnu* | linux*)
 148     os_include_dir="os/gnu-linux"
 149     ;;
 150   hpux*)
 151     os_include_dir="os/hpux"
 152     ;;
 153   irix[1-6] | irix[1-5].* | irix6.[0-4]*)
 154     # This is known to work on at least IRIX 5.2 and 6.3.
 155     os_include_dir="os/irix/irix5.2"
 156     ATOMICITYH=$os_include_dir
 157     ;;
 158   irix6.5*)
 159     os_include_dir="os/irix/irix6.5"
 160     ATOMICITYH=$os_include_dir
 161     ;;
 162   mingw32*)
 163     os_include_dir="os/mingw32"
 164     ;;
 165   netbsd*)
 166     os_include_dir="os/bsd/netbsd"
 167     ;;
 168   solaris2.5*)
 169     os_include_dir="os/solaris/solaris2.5"
 170     ;;
 171   solaris2.6*)
 172     os_include_dir="os/solaris/solaris2.6"
 173     ;;
 174   solaris2.[789]*)
 175     os_include_dir="os/solaris/solaris2.7"
 176     ;;
 177   windiss*)
 178     os_include_dir="os/windiss"
 179     ;;
 180   qnx6.[12]*)
 181     os_include_dir="os/qnx/qnx6.1"
 182     c_model=c
 183     ;;
 184   *)
 185     os_include_dir="os/generic"
 186     ;;
 187 esac
 188
 189
 190 # Set any OS-dependent and CPU-dependent bits.
 191 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 192 case "${host}" in
 193   mips*-*-linux*)
 194     ATOMICITYH="cpu/mips"
 195     ;;
 196 esac