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 not used
  21 #                          directly, but sets the default for others.
  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 #   abi_tweaks_dir         location of cxxabi_tweaks.h,
  34 #                          defaults to cpu_include_dir
  35 #
  36 #   atomicity_dir          location of atomicity.h,
  37 #                          defaults to cpu_include_dir
  38 #
  39 #   atomic_word_dir        location of atomic_word.h
  40 #                          defaults to generic.
  41 #
  42 # It possibly modifies the following variables:
  43 #
  44 #   OPT_LDFLAGS            extra flags to pass when linking the library, of
  45 #                          the form '-Wl,blah'
  46 #                          (defaults to empty in acinclude.m4)
  47 #
  48 #   port_specific_symbol_files
  49 #                          whitespace-seperated list of files containing
  50 #                          additional symbols to export from the shared
  51 #                          library, when symbol versioning is in use
  52 #
  53 #
  54 # If the defaults will not work for your platform, you need only change the
  55 # variables that won't work, i.e., you do not need to explicitly set a
  56 # working variable to its default.  Most hosts only need to change the two
  57 # *_include_dir variables.
  58
  59
  60 # DEFAULTS
  61 # Try to guess a default cpu_include_dir based on the name of the CPU.  We
  62 # cannot do this for os_include_dir; there are too many portable operating
  63 # systems out there.  :-)
  64 c_model=c_std
  65 c_compatibility=no
  66 atomic_word_dir=cpu/generic
  67
  68 # HOST-SPECIFIC OVERRIDES
  69 # Set any CPU-dependent bits.
  70 # Here we override defaults and catch more general cases due to naming
  71 # conventions (e.g., chip_name* to catch all variants).
  72
  73 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
  74 case "${host_cpu}" in
  75   alpha*)
  76     try_cpu=alpha
  77     ;;
  78   arm* | xscale | ep9312)
  79     try_cpu=arm
  80     ;;
  81   i[567]86 | x86_64)
  82     try_cpu=i486
  83     ;;
  84   hppa*)
  85     try_cpu=hppa
  86     ;;
  87   mips*)
  88     # NB: cpu/mips/atomicity.h needs MIPS II or above.
  89     # Of course, there is no sane way to test for this, no ABI macro,
  90     # and no consistent host_cpu name differentiation. Therefore, only
  91     # use it where it is known to be safe, ie it runs linux (see below).
  92     try_cpu=generic
  93     ;;
  94   m680[246]0)
  95     try_cpu=m68k
  96     ;;
  97   powerpc* | rs6000)
  98     try_cpu=powerpc
  99     ;;
 100   s390x)
 101     try_cpu=s390
 102     ;;
 103   sparc* | ultrasparc)
 104     try_cpu=sparc
 105     ;;
 106   *)
 107     if test -d ${glibcxx_srcdir}/config/cpu/${host_cpu}; then
 108       try_cpu=${host_cpu}
 109     else
 110       try_cpu=generic
 111     fi
 112     ;;
 113 esac
 114
 115 # Set specific CPU overrides for atomic_word_dir. Most can just use generic.
 116 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 117 case "${host_cpu}" in
 118   cris*)
 119     atomic_word_dir=cpu/cris
 120     ;;
 121   sparc* | ultrasparc)
 122     atomic_word_dir=cpu/sparc
 123     ;;
 124 esac
 125
 126 # Now look for the file(s) usually tied to a CPU model, and make
 127 # default choices for those if they haven't been explicitly set
 128 # already.
 129 cpu_include_dir=cpu/${try_cpu}
 130 abi_baseline_pair=${try_cpu}-${host_os}
 131 unset try_cpu
 132
 133 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/atomicity.h ; then
 134   atomicity_dir=$cpu_include_dir
 135 else
 136   atomicity_dir="cpu/generic"
 137 fi
 138
 139 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/cxxabi_tweaks.h ; then
 140   abi_tweaks_dir=$cpu_include_dir
 141 else
 142   abi_tweaks_dir="cpu/generic"
 143 fi
 144
 145 # Set any OS-dependent bits.
 146 # Set the os_include_dir.
 147 # Set c_model, c_compatibility here.
 148 # If atomic ops and/or numeric limits are OS-specific rather than
 149 # CPU-specifc, set those here too.
 150 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 151 case "${host_os}" in
 152   aix4.[3456789]* | aix[56789]*)
 153     # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
 154     # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
 155     # explicitly duplicate the directory for 4.[<3].
 156     os_include_dir="os/aix"
 157     atomicity_dir="os/aix"
 158     atomic_word_dir="os/aix"
 159     OPT_LDFLAGS="-Wl,-G"
 160     ;;
 161   aix4.*)
 162     os_include_dir="os/generic"
 163     atomicity_dir="os/aix"
 164     atomic_word_dir="os/aix"
 165     ;;
 166   aix*)
 167     os_include_dir="os/generic"
 168     atomicity_dir="cpu/generic"
 169     ;;
 170   bsd*)
 171     # Plain BSD attempts to share FreeBSD files.
 172     os_include_dir="os/bsd/freebsd"
 173     ;;
 174   cygwin*)
 175     os_include_dir="os/newlib"
 176     ;;
 177   darwin | darwin[1-7] | darwin[1-7].*)
 178     # On Darwin, performance is improved if libstdc++ is single-module.
 179     # Up to at least 10.3.7, -flat_namespace is required for proper
 180     # treatment of coalesced symbols.
 181     OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module -Wl,-flat_namespace"
 182     os_include_dir="os/bsd/darwin"
 183     ;;
 184   darwin[89] | darwin[89].* | darwin[1-9][0-9]* )
 185     # On Darwin, performance is improved if libstdc++ is single-module,
 186     # and on 8+ compatibility is better if not -flat_namespace.
 187     OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module"
 188     os_include_dir="os/bsd/darwin"
 189     ;;
 190   *djgpp*)      # leading * picks up "msdosdjgpp"
 191     os_include_dir="os/djgpp"
 192     ;;
 193   freebsd*)
 194     os_include_dir="os/bsd/freebsd"
 195     ;;
 196   gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
 197     os_include_dir="os/gnu-linux"
 198     ;;
 199   hpux*)
 200     os_include_dir="os/hpux"
 201     ;;
 202   irix[1-6] | irix[1-5].* | irix6.[0-4]*)
 203     # This is known to work on at least IRIX 5.2 and 6.3.
 204     os_include_dir="os/irix/irix5.2"
 205     atomicity_dir=os/irix
 206     atomic_word_dir=os/irix
 207     ;;
 208   irix6.5*)
 209     os_include_dir="os/irix/irix6.5"
 210     atomicity_dir=os/irix
 211     atomic_word_dir=os/irix
 212     ;;
 213   mingw32*)
 214     os_include_dir="os/mingw32"
 215     ;;
 216   netbsd*)
 217     os_include_dir="os/bsd/netbsd"
 218     ;;
 219   qnx6.[12]*)
 220     os_include_dir="os/qnx/qnx6.1"
 221     c_model=c
 222     ;;
 223   solaris2)
 224     # This too-vague configuration does not provide enough information
 225     # to select a ctype include, and thus os_include_dir is a crap shoot.
 226     echo "Please specify the full version of Solaris, ie. solaris2.9 " 1>&2
 227     exit 1
 228     ;;
 229   solaris2.5 | solaris2.5.[0-9])
 230     os_include_dir="os/solaris/solaris2.5"
 231     ;;
 232   solaris2.6)
 233     os_include_dir="os/solaris/solaris2.6"
 234     ;;
 235   solaris2.[789] | solaris2.1[0-9])
 236     os_include_dir="os/solaris/solaris2.7"
 237     ;;
 238   tpf)
 239     os_include_dir="os/tpf"
 240     ;;
 241   vxworks)
 242     os_include_dir="os/vxworks"
 243     ;;
 244   windiss*)
 245     os_include_dir="os/windiss"
 246     ;;
 247   *)
 248     os_include_dir="os/generic"
 249     ;;
 250 esac
 251
 252
 253 # Set any OS-dependent and CPU-dependent bits.
 254 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 255 case "${host}" in
 256   alpha*-*-freebsd5*)
 257     abi_baseline_pair="alpha-freebsd5"
 258     ;;
 259   arm*-*-linux*)
 260     abi_baseline_pair="arm-linux-gnu"
 261     ;;
 262   i*86-*-freebsd4*)
 263     abi_baseline_pair="i386-freebsd4"
 264     ;;
 265   i*86-*-freebsd5*)
 266     abi_baseline_pair="i386-freebsd5"
 267     ;;
 268   mips*-*-linux*)
 269     atomicity_dir="cpu/mips"
 270     abi_baseline_pair="mips-linux-gnu"
 271     cpu_include_dir="cpu/mips"
 272     ;;
 273   s390-*-linux*)
 274     abi_baseline_pair="s390-linux-gnu"
 275     ;;
 276   s390x-*-linux*)
 277     abi_baseline_pair="s390x-linux-gnu"
 278     ;;
 279   sparc*-*-freebsd5*)
 280     abi_baseline_pair="sparc-freebsd5"
 281     ;;
 282   x86_64-*-linux*)
 283     abi_baseline_pair="x86_64-linux-gnu"
 284     ;;
 285 esac