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 #   fpos_include_dir       directory for definition of fpos template
  34 #
  35 #   atomicity_include_dir  location of atomicity.h,
  36 #                          defaults to cpu_include_dir
  37 #
  38 # It possibly modifies the following variables:
  39 #
  40 #   OPT_LDFLAGS            extra flags to pass when linking the library, of
  41 #                          the form '-Wl,blah'
  42 #                          (defaults to empty in acinclude.m4)
  43 #
  44 #   port_specific_symbol_files
  45 #                          whitespace-seperated list of files containing
  46 #                          additional symbols to export from the shared
  47 #                          library, when symbol versioning is in use
  48 #
  49 #
  50 # If the defaults will not work for your platform, you need only change the
  51 # variables that won't work, i.e., you do not need to explicitly set a
  52 # working variable to its default.  Most hosts only need to change the two
  53 # *_include_dir variables.
  54
  55
  56 # DEFAULTS
  57 # Try to guess a default cpu_include_dir based on the name of the CPU.  We
  58 # cannot do this for os_include_dir; there are too many portable operating
  59 # systems out there.  :-)
  60 c_model=c_std
  61 c_compatibility=no
  62 fpos_include_dir="os/generic"
  63
  64 # HOST-SPECIFIC OVERRIDES
  65 # Set any CPU-dependent bits.
  66 # Here we override defaults and catch more general cases due to naming
  67 # conventions (e.g., chip_name* to catch all variants).
  68
  69 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
  70 case "${host_cpu}" in
  71   alpha*)
  72     try_cpu=alpha
  73     ;;
  74   i[567]86 | x86_64)
  75     try_cpu=i486
  76     ;;
  77   hppa*)
  78     try_cpu=hppa
  79     ;;
  80   mips*)
  81     # NB: cpu/mips/atomicity.h needs MIPS II or above.
  82     # Of course, there is no sane way to test for this, no ABI macro,
  83     # and no consistent host_cpu name differentiation. Therefore, only
  84     # use it where it is known to be safe, ie it runs linux (see below).
  85     try_cpu=generic
  86     ;;
  87   m680[246]0)
  88     try_cpu=m68k
  89     ;;
  90   powerpc* | rs6000)
  91     try_cpu=powerpc
  92     ;;
  93   s390x)
  94     try_cpu=s390
  95     ;;
  96   sparc* | ultrasparc)
  97     try_cpu=sparc
  98     ;;
  99   *)
 100     if test -d ${glibcxx_srcdir}/config/cpu/${host_cpu}; then
 101       try_cpu=${host_cpu}
 102     else
 103       try_cpu=generic
 104     fi
 105     ;;
 106 esac
 107
 108 # Now look for the file(s) usually tied to a CPU model, and make
 109 # default choices for those if they haven't been explicitly set
 110 # already.
 111 cpu_include_dir="cpu/${try_cpu}"
 112 atomicity_include_dir=$cpu_include_dir
 113 abi_baseline_pair=${try_cpu}-${host_os}
 114
 115
 116 # Set any OS-dependent bits.
 117 # Set the os_include_dir.
 118 # Set c_model, c_compatibility here.
 119 # If atomic ops and/or numeric limits are OS-specific rather than
 120 # CPU-specifc, set those here too.
 121 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 122 case "${host_os}" in
 123   aix4.[3456789]* | aix[56789]*)
 124     # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
 125     # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
 126     # explicitly duplicate the directory for 4.[<3].
 127     os_include_dir="os/aix"
 128     atomicity_include_dir="os/aix"
 129     OPT_LDFLAGS="-Wl,-G"
 130     ;;
 131   aix4.*)
 132     atomicity_include_dir="os/aix"
 133     ;;
 134   aix*)
 135     atomicity_include_dir="cpu/generic"
 136     ;;
 137   bsd*)
 138     # Plain BSD attempts to share FreeBSD files.
 139     os_include_dir="os/bsd/freebsd"
 140     ;;
 141   cygwin*)
 142     os_include_dir="os/newlib"
 143     ;;
 144   *djgpp*)      # leading * picks up "msdosdjgpp"
 145     os_include_dir="os/djgpp"
 146     ;;
 147   freebsd*)
 148     os_include_dir="os/bsd/freebsd"
 149     ;;
 150   gnu* | linux*)
 151     os_include_dir="os/gnu-linux"
 152     fpos_include_dir=$os_include_dir
 153     ;;
 154   hpux*)
 155     os_include_dir="os/hpux"
 156     ;;
 157   irix[1-6] | irix[1-5].* | irix6.[0-4]*)
 158     # This is known to work on at least IRIX 5.2 and 6.3.
 159     os_include_dir="os/irix/irix5.2"
 160     atomicity_include_dir=$os_include_dir
 161     ;;
 162   irix6.5*)
 163     os_include_dir="os/irix/irix6.5"
 164     atomicity_include_dir=$os_include_dir
 165     ;;
 166   mingw32*)
 167     os_include_dir="os/mingw32"
 168     ;;
 169   netbsd*)
 170     os_include_dir="os/bsd/netbsd"
 171     ;;
 172   qnx6.[12]*)
 173     os_include_dir="os/qnx/qnx6.1"
 174     c_model=c
 175     ;;
 176   solaris2.5*)
 177     os_include_dir="os/solaris/solaris2.5"
 178     ;;
 179   solaris2.6*)
 180     os_include_dir="os/solaris/solaris2.6"
 181     ;;
 182   solaris2.[789]*)
 183     os_include_dir="os/solaris/solaris2.7"
 184     ;;
 185   windiss*)
 186     os_include_dir="os/windiss"
 187     ;;
 188   *)
 189     os_include_dir="os/generic"
 190     ;;
 191 esac
 192
 193
 194 # Set any OS-dependent and CPU-dependent bits.
 195 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 196 case "${host}" in
 197   mips*-*-linux*)
 198     atomicity_include_dir="cpu/mips"
 199     ;;
 200   x86_64-*-linux*)
 201     abi_baseline_pair="x86_64-linux-gnu"
 202     ;;
 203   alpha*-*-freebsd5*)
 204     abi_baseline_pair="alpha-freebsd5"
 205     ;;
 206   i*86-*-freebsd4*)
 207     abi_baseline_pair="i386-freebsd4"
 208     ;;
 209   i*86-*-freebsd5*)
 210     abi_baseline_pair="i386-freebsd5"
 211     ;;
 212   sparc*-*-freebsd5*)
 213     abi_baseline_pair="sparc-freebsd5"
 214     ;;
 215 esac