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_global.
  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 #   atomic_flags           extra flags to pass to use atomic instructions
  43 #                          defaults to nothing.
  44 #
  45 #   cpu_defines_dir        location of cpu_defines.h
  46 #                          defaults to generic.
  47 #
  48 #
  49 #   error_constants_dir    location of error_constants.h
  50 #                          defaults to os/generic.
  51 #
  52 # It possibly modifies the following variables:
  53 #
  54 #   OPT_LDFLAGS            extra flags to pass when linking the library, of
  55 #                          the form '-Wl,blah'
  56 #                          (defaults to empty in acinclude.m4)
  57 #
  58 #   port_specific_symbol_files
  59 #                          whitespace-seperated list of files containing
  60 #                          additional symbols to export from the shared
  61 #                          library, when symbol versioning is in use
  62 #
  63 #
  64 # If the defaults will not work for your platform, you need only change the
  65 # variables that won't work, i.e., you do not need to explicitly set a
  66 # working variable to its default.  Most hosts only need to change the two
  67 # *_include_dir variables.
  68
  69
  70 # DEFAULTS
  71 # Try to guess a default cpu_include_dir based on the name of the CPU.  We
  72 # cannot do this for os_include_dir; there are too many portable operating
  73 # systems out there.  :-)
  74 c_model=c_global
  75 c_compatibility=no
  76 atomic_word_dir=cpu/generic
  77 atomic_flags=""
  78 atomicity_dir="cpu/generic"
  79 cpu_defines_dir="cpu/generic"
  80 try_cpu=generic
  81 abi_tweaks_dir="cpu/generic"
  82 error_constants_dir="os/generic"
  83
  84 # HOST-SPECIFIC OVERRIDES
  85 # Set any CPU-dependent bits.
  86
  87 # Provide a way to funnel exotic flavors and prefixed/postfixed chip
  88 # variants into the established source config/cpu/* sub-directories.
  89 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
  90 case "${host_cpu}" in
  91   alpha*)
  92     try_cpu=alpha
  93     ;;
  94   arm*)
  95     try_cpu=arm
  96     ;;
  97   crisv32)
  98     try_cpu=cris
  99     ;;
 100   i[567]86 | x86_64)
 101     try_cpu=i486
 102     ;;
 103   hppa*)
 104     try_cpu=hppa
 105     ;;
 106   mep*)
 107     EXTRA_CXX_FLAGS=-mm
 108     try_cpu=generic
 109     ;;
 110   mips*)
 111     try_cpu=mips
 112     ;;
 113   powerpc* | rs6000)
 114     try_cpu=powerpc
 115     ;;
 116   sparc* | ultrasparc)
 117     try_cpu=sparc
 118     ;;
 119   *)
 120     if test -d ${glibcxx_srcdir}/config/cpu/${host_cpu}; then
 121       try_cpu=${host_cpu}
 122     fi
 123 esac
 124
 125
 126 # Now look for the file(s) usually tied to a CPU model, and make
 127 # default choices for those if they haven't been explicitly set
 128 # already.
 129 cpu_include_dir=cpu/${try_cpu}
 130
 131
 132 # Set specific CPU overrides for cpu_defines_dir. Most can just use generic.
 133 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 134 case "${host_cpu}" in
 135   powerpc* | rs6000)
 136     cpu_defines_dir=cpu/powerpc
 137     ;;
 138 esac
 139
 140
 141 # Set specific CPU overrides for atomic_word_dir and atomic_flags.
 142 # Most can just use generic.
 143 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 144 case "${host_cpu}" in
 145   alpha*)
 146     atomic_word_dir=cpu/alpha
 147     ;;
 148   cris*)
 149     atomic_word_dir=cpu/cris
 150     ;;
 151   ia64)
 152     atomic_word_dir=cpu/ia64
 153     ;;
 154   i[4567]86 | x86_64)
 155     atomic_flags="-march=native"
 156     ;;
 157   powerpc* | rs6000)
 158     atomic_word_dir=cpu/powerpc
 159     ;;
 160   sparc* | ultrasparc)
 161     atomic_word_dir=cpu/sparc
 162     atomic_flags="-mcpu=v9"
 163     ;;
 164 esac
 165
 166
 167 # Set specific CPU overrides for atomicity_dir.
 168 # This can be over-ridden in GLIBCXX_ENABLE_ATOMIC_BUILTINS.
 169 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 170 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/atomicity.h ; then
 171   atomicity_dir=$cpu_include_dir
 172 fi
 173
 174
 175 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/cxxabi_tweaks.h ; then
 176   abi_tweaks_dir=$cpu_include_dir
 177 fi
 178
 179
 180 # Set any OS-dependent bits.
 181 # Set the os_include_dir.
 182 # Set the error_costants_dir.
 183 # Set c_model, c_compatibility here.
 184 # If atomic ops and/or numeric limits are OS-specific rather than
 185 # CPU-specifc, set those here too.
 186 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 187 case "${host_os}" in
 188   aix4.[3456789]* | aix[56789]*)
 189     # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
 190     # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
 191     # explicitly duplicate the directory for 4.[<3].
 192     os_include_dir="os/aix"
 193     atomicity_dir="os/aix"
 194     atomic_word_dir="os/aix"
 195     OPT_LDFLAGS="-Wl,-G"
 196     ;;
 197   aix4.*)
 198     os_include_dir="os/generic"
 199     atomicity_dir="os/aix"
 200     atomic_word_dir="os/aix"
 201     ;;
 202   aix*)
 203     os_include_dir="os/generic"
 204     atomicity_dir="cpu/generic"
 205     ;;
 206   bsd*)
 207     # Plain BSD attempts to share FreeBSD files.
 208     os_include_dir="os/bsd/freebsd"
 209     ;;
 210   cygwin*)
 211     os_include_dir="os/newlib"
 212     OPT_LDFLAGS="${OPT_LDFLAGS} -no-undefined -bindir \$(bindir)"
 213     ;;
 214   darwin | darwin[1-7] | darwin[1-7].*)
 215     # On Darwin, performance is improved if libstdc++ is single-module.
 216     # Up to at least 10.3.7, -flat_namespace is required for proper
 217     # treatment of coalesced symbols.
 218     OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module -Wl,-flat_namespace"
 219     os_include_dir="os/bsd/darwin"
 220     ;;
 221   darwin[89] | darwin[89].* | darwin[1-9][0-9]* )
 222     # On Darwin, performance is improved if libstdc++ is single-module,
 223     # and on 8+ compatibility is better if not -flat_namespace.
 224     OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module"
 225     case "${host_cpu}" in
 226       i[34567]86 | x86_64)
 227         OPTIMIZE_CXXFLAGS="${OPTIMIZE_CXXFLAGS} -fvisibility-inlines-hidden"
 228         ;;
 229     esac
 230     os_include_dir="os/bsd/darwin"
 231     ;;
 232   *djgpp*)      # leading * picks up "msdosdjgpp"
 233     os_include_dir="os/djgpp"
 234     error_constants_dir="os/djgpp"
 235     ;;
 236   freebsd*)
 237     os_include_dir="os/bsd/freebsd"
 238     ;;
 239   gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
 240     if [ "$uclibc" = "yes" ]; then
 241       os_include_dir="os/uclibc"
 242     elif [ "$bionic" = "yes" ]; then
 243       os_include_dir="os/bionic"
 244     else
 245       os_include_dir="os/gnu-linux"
 246     fi
 247     ;;
 248   hpux*)
 249     os_include_dir="os/hpux"
 250     ;;
 251   irix6.5*)
 252     os_include_dir="os/irix/irix6.5"
 253     atomicity_dir=os/irix
 254     atomic_word_dir=os/irix
 255     ;;
 256   mingw32*)
 257     os_include_dir="os/mingw32"
 258     error_constants_dir="os/mingw32"
 259     OPT_LDFLAGS="${OPT_LDFLAGS} -no-undefined -bindir \$(bindir)"
 260     ;;
 261   netbsd*)
 262     os_include_dir="os/bsd/netbsd"
 263     ;;
 264   qnx6.[12]*)
 265     os_include_dir="os/qnx/qnx6.1"
 266     c_model=c
 267     ;;
 268   solaris2)
 269     # This too-vague configuration does not provide enough information
 270     # to select a ctype include, and thus os_include_dir is a crap shoot.
 271     echo "Please specify the full version of Solaris, ie. solaris2.9 " 1>&2
 272     exit 1
 273     ;;
 274   solaris2.[89] | solaris2.1[0-9])
 275     os_include_dir="os/solaris/solaris2.7"
 276     ;;
 277   tpf)
 278     os_include_dir="os/tpf"
 279     ;;
 280   vxworks)
 281     os_include_dir="os/vxworks"
 282     ;;
 283   *)
 284     os_include_dir="os/generic"
 285     ;;
 286 esac
 287
 288
 289 # Set any OS-dependent and CPU-dependent bits.
 290 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 291 case "${host}" in
 292   *-*-linux*)
 293     case "${host_cpu}" in
 294       i[567]86)
 295         abi_baseline_pair=i486-linux-gnu
 296         ;;
 297       mips64*)
 298         abi_baseline_pair=mips64-linux-gnu
 299         ;;
 300       powerpc64)
 301         abi_baseline_pair=powerpc64-linux-gnu
 302         ;;
 303       s390)
 304         abi_baseline_pair=s390-linux-gnu
 305         ;;
 306       s390x)
 307         abi_baseline_pair=s390x-linux-gnu
 308         ;;
 309       x86_64)
 310         abi_baseline_pair=x86_64-linux-gnu
 311         ;;
 312       *)
 313         if test -d ${glibcxx_srcdir}/config/abi/post/${try_cpu}-linux-gnu; then
 314           abi_baseline_pair=${try_cpu}-linux-gnu
 315         fi
 316     esac
 317     case "${host}" in
 318       arm*-*-linux-*eabi)
 319         port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
 320         ;;
 321     esac
 322     ;;
 323   i?86-*-solaris2*)
 324     abi_baseline_pair=i386-solaris2
 325     ;;
 326   powerpc*-*-darwin*)
 327     port_specific_symbol_files="\$(srcdir)/../config/os/bsd/darwin/ppc-extra.ver"
 328     ;;
 329   sparc*-*-solaris2*)
 330     abi_baseline_pair=sparc-solaris2
 331     ;;
 332 esac