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 "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 #   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 c_model=c_std
  54 c_compatibility=no
  55
  56
  57 # HOST-SPECIFIC OVERRIDES
  58 # Set any CPU-dependent bits.
  59 # Here we override defaults and catch more general cases due to naming
  60 # conventions (e.g., chip_name* to catch all variants).
  61 if test -d ${glibcpp_srcdir}/config/cpu/${host_cpu}; then
  62   try_cpu=${host_cpu}
  63 fi
  64
  65 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
  66 case "${host_cpu}" in
  67   alpha*)
  68     try_cpu=alpha
  69     ;;
  70   athlon* | i586 | i686 | i786 | x86_64)
  71     try_cpu=i486
  72     ;;
  73   hppa*)
  74     try_cpu=hppa
  75     ;;
  76   mips*)
  77     # NB: cpu/mips/atomicity.h needs MIPS II or above.
  78     # Of course, there is no sane way to test for this, no ABI macro,
  79     # and no consistent host_cpu name differentiation. Therefore, only
  80     # use it where it is known to be safe, ie it runs linux (see below).
  81     try_cpu=generic
  82     ;;
  83   m680[246]0)
  84     try_cpu=m68k
  85     ;;
  86   powerpc* | rs6000)
  87     try_cpu=powerpc
  88     ;;
  89   s390x)
  90     try_cpu=s390
  91     ;;
  92   sparc* | ultrasparc)
  93     try_cpu=sparc
  94     ;;
  95   *)
  96     try_cpu=generic
  97     ;;
  98 esac
  99
 100
 101 # Now look for the file(s) usually tied to a CPU model, and make default
 102 # choices for those if they haven't been explicitly set already.
 103 cpu_include_dir="cpu/${try_cpu}"
 104 ATOMICITYH=$cpu_include_dir
 105
 106
 107 # Check whether ABI baseline file exists, if not try to guess name.
 108 abi_baseline_pair=${try_cpu}-${host_os}
 109 try_baseline_file=config/abi/${abi_baseline_pair}/baseline_symbols.txt
 110 if test ! -e ${glibcpp_srcdir}/${try_baseline_file} ; then
 111   case "${host}" in
 112     i*86-*-freebsd4*)
 113       abi_baseline_pair="i386-freebsd4"
 114       ;;
 115   esac
 116 fi
 117
 118
 119 # Set any OS-dependent bits.
 120 # Set the os_include_dir.
 121 # Set c_model, c_compatibility here.
 122 # If atomic ops and/or numeric limits are OS-specific rather than
 123 # CPU-specifc, set those here too.
 124 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 125 case "${host_os}" in
 126   aix4.[3456789]* | aix[56789]*)
 127     # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
 128     # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
 129     # explicitly duplicate the directory for 4.[<3].
 130     os_include_dir="os/aix"
 131     ATOMICITYH="os/aix"
 132     OPT_LDFLAGS="-Wl,-G"
 133     ;;
 134   aix4.*)
 135     ATOMICITYH="os/aix"
 136     ;;
 137   aix*)
 138     ATOMICITYH="cpu/generic"
 139     ;;
 140   bsd*)
 141     # Plain BSD attempts to share FreeBSD files.
 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   freebsd*)
 151     os_include_dir="os/bsd/freebsd"
 152     ;;
 153   gnu* | linux*)
 154     os_include_dir="os/gnu-linux"
 155     ;;
 156   hpux*)
 157     os_include_dir="os/hpux"
 158     ;;
 159   irix[1-6] | irix[1-5].* | irix6.[0-4]*)
 160     # This is known to work on at least IRIX 5.2 and 6.3.
 161     os_include_dir="os/irix/irix5.2"
 162     ATOMICITYH=$os_include_dir
 163     ;;
 164   irix6.5*)
 165     os_include_dir="os/irix/irix6.5"
 166     ATOMICITYH=$os_include_dir
 167     ;;
 168   mingw32*)
 169     os_include_dir="os/mingw32"
 170     ;;
 171   netbsd*)
 172     os_include_dir="os/bsd/netbsd"
 173     ;;
 174   solaris2.5*)
 175     os_include_dir="os/solaris/solaris2.5"
 176     ;;
 177   solaris2.6*)
 178     os_include_dir="os/solaris/solaris2.6"
 179     ;;
 180   solaris2.[789]*)
 181     os_include_dir="os/solaris/solaris2.7"
 182     ;;
 183   windiss*)
 184     os_include_dir="os/windiss"
 185     ;;
 186   qnx6.[12]*)
 187     os_include_dir="os/qnx/qnx6.1"
 188     c_model=c
 189     ;;
 190   *)
 191     os_include_dir="os/generic"
 192     ;;
 193 esac
 194
 195
 196 # Set any OS-dependent and CPU-dependent bits.
 197 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 198 case "${host}" in
 199   mips*-*-linux*)
 200     ATOMICITYH="cpu/mips"
 201     ;;
 202 esac