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 #   cpu_defines_dir        location of cpu_defines.h
  43 #                          defaults to generic.
  44 #
  45 # It possibly modifies the following variables:
  46 #
  47 #   OPT_LDFLAGS            extra flags to pass when linking the library, of
  48 #                          the form '-Wl,blah'
  49 #                          (defaults to empty in acinclude.m4)
  50 #
  51 #   port_specific_symbol_files
  52 #                          whitespace-seperated list of files containing
  53 #                          additional symbols to export from the shared
  54 #                          library, when symbol versioning is in use
  55 #
  56 #
  57 # If the defaults will not work for your platform, you need only change the
  58 # variables that won't work, i.e., you do not need to explicitly set a
  59 # working variable to its default.  Most hosts only need to change the two
  60 # *_include_dir variables.
  61
  62
  63 # DEFAULTS
  64 # Try to guess a default cpu_include_dir based on the name of the CPU.  We
  65 # cannot do this for os_include_dir; there are too many portable operating
  66 # systems out there.  :-)
  67 c_model=c_std
  68 c_compatibility=no
  69 atomic_word_dir=cpu/generic
  70 cpu_defines_dir=cpu/generic
  71
  72 # HOST-SPECIFIC OVERRIDES
  73 # Set any CPU-dependent bits.
  74 # Here we override defaults and catch more general cases due to naming
  75 # conventions (e.g., chip_name* to catch all variants).
  76
  77 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
  78 case "${host_cpu}" in
  79   alpha*)
  80     try_cpu=alpha
  81     ;;
  82   arm* | xscale | ep9312)
  83     try_cpu=arm
  84     ;;
  85   i[567]86 | x86_64)
  86     try_cpu=i486
  87     ;;
  88   hppa*)
  89     try_cpu=hppa
  90     ;;
  91   mips*)
  92     # NB: cpu/mips/atomicity.h needs MIPS II or above.
  93     # Of course, there is no sane way to test for this, no ABI macro,
  94     # and no consistent host_cpu name differentiation. Therefore, only
  95     # use it where it is known to be safe, ie it runs linux (see below).
  96     try_cpu=generic
  97     ;;
  98   m680[246]0)
  99     try_cpu=m68k
 100     ;;
 101   powerpc* | rs6000)
 102     try_cpu=powerpc
 103     ;;
 104   s390x)
 105     try_cpu=s390
 106     ;;
 107   sparc* | ultrasparc)
 108     try_cpu=sparc
 109     ;;
 110   *)
 111     if test -d ${glibcxx_srcdir}/config/cpu/${host_cpu}; then
 112       try_cpu=${host_cpu}
 113     else
 114       try_cpu=generic
 115     fi
 116     ;;
 117 esac
 118
 119 # Set specific CPU overrides for atomic_word_dir. Most can just use generic.
 120 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 121 case "${host_cpu}" in
 122   cris*)
 123     atomic_word_dir=cpu/cris
 124     ;;
 125   sparc* | ultrasparc)
 126     atomic_word_dir=cpu/sparc
 127     ;;
 128 esac
 129
 130 # Set specific CPU overrides for cpu_defines_dir. Most can just use generic.
 131 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 132 case "${host_cpu}" in
 133   powerpc* | rs6000)
 134     cpu_defines_dir=cpu/powerpc
 135     ;;
 136 esac
 137
 138 # Now look for the file(s) usually tied to a CPU model, and make
 139 # default choices for those if they haven't been explicitly set
 140 # already.
 141 cpu_include_dir=cpu/${try_cpu}
 142 abi_baseline_pair=${try_cpu}-${host_os}
 143 unset try_cpu
 144
 145 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/atomicity.h ; then
 146   atomicity_dir=$cpu_include_dir
 147 else
 148   atomicity_dir="cpu/generic"
 149 fi
 150
 151 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/cxxabi_tweaks.h ; then
 152   abi_tweaks_dir=$cpu_include_dir
 153 else
 154   abi_tweaks_dir="cpu/generic"
 155 fi
 156
 157 # Set any OS-dependent bits.
 158 # Set the os_include_dir.
 159 # Set c_model, c_compatibility here.
 160 # If atomic ops and/or numeric limits are OS-specific rather than
 161 # CPU-specifc, set those here too.
 162 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 163 case "${host_os}" in
 164   aix4.[3456789]* | aix[56789]*)
 165     # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
 166     # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
 167     # explicitly duplicate the directory for 4.[<3].
 168     os_include_dir="os/aix"
 169     atomicity_dir="os/aix"
 170     atomic_word_dir="os/aix"
 171     OPT_LDFLAGS="-Wl,-G"
 172     ;;
 173   aix4.*)
 174     os_include_dir="os/generic"
 175     atomicity_dir="os/aix"
 176     atomic_word_dir="os/aix"
 177     ;;
 178   aix*)
 179     os_include_dir="os/generic"
 180     atomicity_dir="cpu/generic"
 181     ;;
 182   bsd*)
 183     # Plain BSD attempts to share FreeBSD files.
 184     os_include_dir="os/bsd/freebsd"
 185     ;;
 186   cygwin*)
 187     os_include_dir="os/newlib"
 188     ;;
 189   darwin | darwin[1-7] | darwin[1-7].*)
 190     # On Darwin, performance is improved if libstdc++ is single-module.
 191     # Up to at least 10.3.7, -flat_namespace is required for proper
 192     # treatment of coalesced symbols.
 193     OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module -Wl,-flat_namespace"
 194     os_include_dir="os/bsd/darwin"
 195     ;;
 196   darwin[89] | darwin[89].* | darwin[1-9][0-9]* )
 197     # On Darwin, performance is improved if libstdc++ is single-module,
 198     # and on 8+ compatibility is better if not -flat_namespace.
 199     OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module"
 200     os_include_dir="os/bsd/darwin"
 201     ;;
 202   *djgpp*)      # leading * picks up "msdosdjgpp"
 203     os_include_dir="os/djgpp"
 204     ;;
 205   freebsd*)
 206     os_include_dir="os/bsd/freebsd"
 207     ;;
 208   gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
 209     os_include_dir="os/gnu-linux"
 210     ;;
 211   hpux*)
 212     os_include_dir="os/hpux"
 213     ;;
 214   irix[1-6] | irix[1-5].* | irix6.[0-4]*)
 215     # This is known to work on at least IRIX 5.2 and 6.3.
 216     os_include_dir="os/irix/irix5.2"
 217     atomicity_dir=os/irix
 218     atomic_word_dir=os/irix
 219     ;;
 220   irix6.5*)
 221     os_include_dir="os/irix/irix6.5"
 222     atomicity_dir=os/irix
 223     atomic_word_dir=os/irix
 224     ;;
 225   mingw32*)
 226     os_include_dir="os/mingw32"
 227     ;;
 228   netbsd*)
 229     os_include_dir="os/bsd/netbsd"
 230     ;;
 231   qnx6.[12]*)
 232     os_include_dir="os/qnx/qnx6.1"
 233     c_model=c
 234     ;;
 235   solaris2)
 236     # This too-vague configuration does not provide enough information
 237     # to select a ctype include, and thus os_include_dir is a crap shoot.
 238     echo "Please specify the full version of Solaris, ie. solaris2.9 " 1>&2
 239     exit 1
 240     ;;
 241   solaris2.5 | solaris2.5.[0-9])
 242     os_include_dir="os/solaris/solaris2.5"
 243     ;;
 244   solaris2.6)
 245     os_include_dir="os/solaris/solaris2.6"
 246     ;;
 247   solaris2.[789] | solaris2.1[0-9])
 248     os_include_dir="os/solaris/solaris2.7"
 249     ;;
 250   tpf)
 251     os_include_dir="os/tpf"
 252     ;;
 253   vxworks)
 254     os_include_dir="os/vxworks"
 255     ;;
 256   windiss*)
 257     os_include_dir="os/windiss"
 258     ;;
 259   *)
 260     os_include_dir="os/generic"
 261     ;;
 262 esac
 263
 264
 265 # Set any OS-dependent and CPU-dependent bits.
 266 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 267 case "${host}" in
 268   alpha*-*-freebsd5*)
 269     abi_baseline_pair="alpha-freebsd5"
 270     ;;
 271   arm*-*-linux*)
 272     abi_baseline_pair="arm-linux-gnu"
 273     ;;
 274   i*86-*-freebsd4*)
 275     abi_baseline_pair="i386-freebsd4"
 276     ;;
 277   i*86-*-freebsd5*)
 278     abi_baseline_pair="i386-freebsd5"
 279     ;;
 280   mips*-*-linux*)
 281     atomicity_dir="cpu/mips"
 282     abi_baseline_pair="mips-linux-gnu"
 283     cpu_include_dir="cpu/mips"
 284     ;;
 285   powerpc*-*-darwin*)
 286     port_specific_symbol_files="\$(srcdir)/../config/os/bsd/darwin/ppc-extra.ver"
 287     ;;
 288   powerpc64-*-linux*)
 289     abi_baseline_pair="powerpc64-linux-gnu"
 290     ;;
 291   s390-*-linux*)
 292     abi_baseline_pair="s390-linux-gnu"
 293     ;;
 294   s390x-*-linux*)
 295     abi_baseline_pair="s390x-linux-gnu"
 296     ;;
 297   sparc*-*-freebsd5*)
 298     abi_baseline_pair="sparc-freebsd5"
 299     ;;
 300   x86_64-*-linux*)
 301     abi_baseline_pair="x86_64-linux-gnu"
 302     ;;
 303 esac