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
  62 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
  63 case "${host_cpu}" in
  64   alpha*)
  65     try_cpu=alpha
  66     ;;
  67   athlon* | i586 | i686 | i786 | x86_64)
  68     try_cpu=i486
  69     ;;
  70   hppa*)
  71     try_cpu=hppa
  72     ;;
  73   mips*)
  74     # NB: cpu/mips/atomicity.h needs MIPS II or above.
  75     # Of course, there is no sane way to test for this, no ABI macro,
  76     # and no consistent host_cpu name differentiation. Therefore, only
  77     # use it where it is known to be safe, ie it runs linux (see below).
  78     try_cpu=generic
  79     ;;
  80   m680[246]0)
  81     try_cpu=m68k
  82     ;;
  83   powerpc* | rs6000)
  84     try_cpu=powerpc
  85     ;;
  86   s390x)
  87     try_cpu=s390
  88     ;;
  89   sparc* | ultrasparc)
  90     try_cpu=sparc
  91     ;;
  92   *)
  93     if test -d ${glibcpp_srcdir}/config/cpu/${host_cpu}; then
  94       try_cpu=${host_cpu}
  95     else
  96       try_cpu=generic
  97     fi
  98     ;;
  99 esac
 100
 101 # Now look for the file(s) usually tied to a CPU model, and make
 102 # default choices for those if they haven't been explicitly set
 103 # already.
 104 cpu_include_dir="cpu/${try_cpu}"
 105 ATOMICITYH=$cpu_include_dir
 106 abi_baseline_pair=${try_cpu}-${host_os}
 107
 108
 109 # Set any OS-dependent bits.
 110 # Set the os_include_dir.
 111 # Set c_model, c_compatibility here.
 112 # If atomic ops and/or numeric limits are OS-specific rather than
 113 # CPU-specifc, set those here too.
 114 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 115 case "${host_os}" in
 116   aix4.[3456789]* | aix[56789]*)
 117     # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
 118     # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
 119     # explicitly duplicate the directory for 4.[<3].
 120     os_include_dir="os/aix"
 121     ATOMICITYH="os/aix"
 122     OPT_LDFLAGS="-Wl,-G"
 123     ;;
 124   aix4.*)
 125     ATOMICITYH="os/aix"
 126     ;;
 127   aix*)
 128     ATOMICITYH="cpu/generic"
 129     ;;
 130   bsd*)
 131     # Plain BSD attempts to share FreeBSD files.
 132     os_include_dir="os/bsd/freebsd"
 133     ;;
 134   cygwin*)
 135     os_include_dir="os/newlib"
 136     ;;
 137   *djgpp*)      # leading * picks up "msdosdjgpp"
 138     os_include_dir="os/djgpp"
 139     ;;
 140   freebsd*)
 141     os_include_dir="os/bsd/freebsd"
 142     ;;
 143   gnu* | linux*)
 144     os_include_dir="os/gnu-linux"
 145     ;;
 146   hpux*)
 147     os_include_dir="os/hpux"
 148     ;;
 149   irix[1-6] | irix[1-5].* | irix6.[0-4]*)
 150     # This is known to work on at least IRIX 5.2 and 6.3.
 151     os_include_dir="os/irix/irix5.2"
 152     ATOMICITYH=$os_include_dir
 153     ;;
 154   irix6.5*)
 155     os_include_dir="os/irix/irix6.5"
 156     ATOMICITYH=$os_include_dir
 157     ;;
 158   mingw32*)
 159     os_include_dir="os/mingw32"
 160     ;;
 161   netbsd*)
 162     os_include_dir="os/bsd/netbsd"
 163     ;;
 164   solaris2.5*)
 165     os_include_dir="os/solaris/solaris2.5"
 166     ;;
 167   solaris2.6*)
 168     os_include_dir="os/solaris/solaris2.6"
 169     ;;
 170   solaris2.[789]*)
 171     os_include_dir="os/solaris/solaris2.7"
 172     ;;
 173   windiss*)
 174     os_include_dir="os/windiss"
 175     ;;
 176   qnx6.[12]*)
 177     os_include_dir="os/qnx/qnx6.1"
 178     c_model=c
 179     ;;
 180   *)
 181     os_include_dir="os/generic"
 182     ;;
 183 esac
 184
 185
 186 # Set any OS-dependent and CPU-dependent bits.
 187 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 188 case "${host}" in
 189   mips*-*-linux*)
 190     ATOMICITYH="cpu/mips"
 191     ;;
 192   x86_64-*-linux*)
 193     abi_baseline_pair="x86_64-linux-gnu"
 194     ;;
 195   alpha*-*-freebsd5*)
 196     abi_baseline_pair="alpha-freebsd5"
 197     ;;
 198   i*86-*-freebsd4*)
 199     abi_baseline_pair="i386-freebsd4"
 200     ;;
 201   i*86-*-freebsd5*)
 202     abi_baseline_pair="i386-freebsd5"
 203     ;;
 204   sparc*-*-freebsd5*)
 205     abi_baseline_pair="sparc-freebsd5"
 206     ;;
 207 esac