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 atomicity_include_dir.
  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 #   atomicity_include_dir  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 #   port_specific_symbol_files
  43 #                          whitespace-seperated list of files containing
  44 #                          additional symbols to export from the shared
  45 #                          library, when symbol versioning is in use
  46 #
  47 #
  48 # If the defaults will not work for your platform, you need only change the
  49 # variables that won't work, i.e., you do not need to explicitly set a
  50 # working variable to its default.  Most hosts only need to change the two
  51 # *_include_dir variables.
  52
  53
  54 # DEFAULTS
  55 # Try to guess a default cpu_include_dir based on the name of the CPU.  We
  56 # cannot do this for os_include_dir; there are too many portable operating
  57 # systems out there.  :-)
  58 c_model=c_std
  59 c_compatibility=no
  60
  61 # HOST-SPECIFIC OVERRIDES
  62 # Set any CPU-dependent bits.
  63 # Here we override defaults and catch more general cases due to naming
  64 # conventions (e.g., chip_name* to catch all variants).
  65
  66 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
  67 case "${host_cpu}" in
  68   alpha*)
  69     try_cpu=alpha
  70     ;;
  71   i[567]86 | x86_64)
  72     try_cpu=i486
  73     ;;
  74   hppa*)
  75     try_cpu=hppa
  76     ;;
  77   mips*)
  78     # NB: cpu/mips/atomicity.h needs MIPS II or above.
  79     # Of course, there is no sane way to test for this, no ABI macro,
  80     # and no consistent host_cpu name differentiation. Therefore, only
  81     # use it where it is known to be safe, ie it runs linux (see below).
  82     try_cpu=generic
  83     ;;
  84   m680[246]0)
  85     try_cpu=m68k
  86     ;;
  87   powerpc* | rs6000)
  88     try_cpu=powerpc
  89     ;;
  90   s390x)
  91     try_cpu=s390
  92     ;;
  93   sparc* | ultrasparc)
  94     try_cpu=sparc
  95     ;;
  96   *)
  97     if test -d ${glibcxx_srcdir}/config/cpu/${host_cpu}; then
  98       try_cpu=${host_cpu}
  99     else
 100       try_cpu=generic
 101     fi
 102     ;;
 103 esac
 104
 105 # Now look for the file(s) usually tied to a CPU model, and make
 106 # default choices for those if they haven't been explicitly set
 107 # already.
 108 cpu_include_dir="cpu/${try_cpu}"
 109 atomicity_include_dir=$cpu_include_dir
 110 abi_baseline_pair=${try_cpu}-${host_os}
 111
 112
 113 # Set any OS-dependent bits.
 114 # Set the os_include_dir.
 115 # Set c_model, c_compatibility here.
 116 # If atomic ops and/or numeric limits are OS-specific rather than
 117 # CPU-specifc, set those here too.
 118 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 119 case "${host_os}" in
 120   aix4.[3456789]* | aix[56789]*)
 121     # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
 122     # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
 123     # explicitly duplicate the directory for 4.[<3].
 124     os_include_dir="os/aix"
 125     atomicity_include_dir="os/aix"
 126     OPT_LDFLAGS="-Wl,-G"
 127     ;;
 128   aix4.*)
 129     os_include_dir="os/generic"
 130     atomicity_include_dir="os/aix"
 131     ;;
 132   aix*)
 133     os_include_dir="os/generic"
 134     atomicity_include_dir="cpu/generic"
 135     ;;
 136   bsd*)
 137     # Plain BSD attempts to share FreeBSD files.
 138     os_include_dir="os/bsd/freebsd"
 139     ;;
 140   cygwin*)
 141     os_include_dir="os/newlib"
 142     ;;
 143   *djgpp*)      # leading * picks up "msdosdjgpp"
 144     os_include_dir="os/djgpp"
 145     ;;
 146   freebsd*)
 147     os_include_dir="os/bsd/freebsd"
 148     ;;
 149   gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
 150     os_include_dir="os/gnu-linux"
 151     ;;
 152   hpux*)
 153     os_include_dir="os/hpux"
 154     ;;
 155   irix[1-6] | irix[1-5].* | irix6.[0-4]*)
 156     # This is known to work on at least IRIX 5.2 and 6.3.
 157     os_include_dir="os/irix/irix5.2"
 158     atomicity_include_dir=$os_include_dir
 159     ;;
 160   irix6.5*)
 161     os_include_dir="os/irix/irix6.5"
 162     atomicity_include_dir=$os_include_dir
 163     ;;
 164   mingw32*)
 165     os_include_dir="os/mingw32"
 166     ;;
 167   netbsd*)
 168     os_include_dir="os/bsd/netbsd"
 169     ;;
 170   qnx6.[12]*)
 171     os_include_dir="os/qnx/qnx6.1"
 172     c_model=c
 173     ;;
 174   solaris2)
 175     # This too-vague configuration does not provide enough information
 176     # to select a ctype include, and thus os_include_dir is a crap shoot.
 177     echo "Please specify the full version of Solaris, ie. solaris2.9 " 1>&2
 178     exit 1;
 179     ;;
 180   solaris2.5 | solaris2.5.[0-9])
 181     os_include_dir="os/solaris/solaris2.5"
 182     ;;
 183   solaris2.6)
 184     os_include_dir="os/solaris/solaris2.6"
 185     ;;
 186   solaris2.[789] | solaris2.1[0-9])
 187     os_include_dir="os/solaris/solaris2.7"
 188     ;;
 189   tpf)
 190     os_include_dir="os/tpf"
 191     ;;
 192   vxworks)
 193     os_include_dir="os/vxworks"
 194     ;;
 195   windiss*)
 196     os_include_dir="os/windiss"
 197     ;;
 198   *)
 199     os_include_dir="os/generic"
 200     ;;
 201 esac
 202
 203
 204 # Set any OS-dependent and CPU-dependent bits.
 205 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 206 case "${host}" in
 207   mips*-*-linux*)
 208     atomicity_include_dir="cpu/mips"
 209     ;;
 210   x86_64-*-linux*)
 211     abi_baseline_pair="x86_64-linux-gnu"
 212     ;;
 213   alpha*-*-freebsd5*)
 214     abi_baseline_pair="alpha-freebsd5"
 215     ;;
 216   i*86-*-freebsd4*)
 217     abi_baseline_pair="i386-freebsd4"
 218     ;;
 219   i*86-*-freebsd5*)
 220     abi_baseline_pair="i386-freebsd5"
 221     ;;
 222   sparc*-*-freebsd5*)
 223     abi_baseline_pair="sparc-freebsd5"
 224     ;;
 225 esac