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     atomicity_include_dir="os/aix"
 130     ;;
 131   aix*)
 132     atomicity_include_dir="cpu/generic"
 133     ;;
 134   bsd*)
 135     # Plain BSD attempts to share FreeBSD files.
 136     os_include_dir="os/bsd/freebsd"
 137     ;;
 138   cygwin*)
 139     os_include_dir="os/newlib"
 140     ;;
 141   *djgpp*)      # leading * picks up "msdosdjgpp"
 142     os_include_dir="os/djgpp"
 143     ;;
 144   freebsd*)
 145     os_include_dir="os/bsd/freebsd"
 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     atomicity_include_dir=$os_include_dir
 157     ;;
 158   irix6.5*)
 159     os_include_dir="os/irix/irix6.5"
 160     atomicity_include_dir=$os_include_dir
 161     ;;
 162   mingw32*)
 163     os_include_dir="os/mingw32"
 164     ;;
 165   netbsd*)
 166     os_include_dir="os/bsd/netbsd"
 167     ;;
 168   qnx6.[12]*)
 169     os_include_dir="os/qnx/qnx6.1"
 170     c_model=c
 171     ;;
 172   solaris2)
 173     # This too-vague configuration does not provide enough information
 174     # to select a ctype include, and thus os_include_dir is a crap shoot.
 175     echo "Please specify the full version of Solaris, ie. solaris2.9 " 1>&2
 176     exit 1;
 177     ;;
 178   solaris2.5 | solaris2.5.[0-9])
 179     os_include_dir="os/solaris/solaris2.5"
 180     ;;
 181   solaris2.6)
 182     os_include_dir="os/solaris/solaris2.6"
 183     ;;
 184   solaris2.[789] | solaris2.1[0-9])
 185     os_include_dir="os/solaris/solaris2.7"
 186     ;;
 187   windiss*)
 188     os_include_dir="os/windiss"
 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     atomicity_include_dir="cpu/mips"
 201     ;;
 202   x86_64-*-linux*)
 203     abi_baseline_pair="x86_64-linux-gnu"
 204     ;;
 205   alpha*-*-freebsd5*)
 206     abi_baseline_pair="alpha-freebsd5"
 207     ;;
 208   i*86-*-freebsd4*)
 209     abi_baseline_pair="i386-freebsd4"
 210     ;;
 211   i*86-*-freebsd5*)
 212     abi_baseline_pair="i386-freebsd5"
 213     ;;
 214   sparc*-*-freebsd5*)
 215     abi_baseline_pair="sparc-freebsd5"
 216     ;;
 217 esac