libgo/configure.ac

   1 # configure.ac -- Go library configure script.
   2
   3 # Copyright 2009 The Go Authors. All rights reserved.
   4 # Use of this source code is governed by a BSD-style
   5 # license that can be found in the LICENSE file.
   6
   7 # Process this file with autoreconf to produce configure.
   8
   9 AC_PREREQ(2.64)
  10 AC_INIT(package-unused, version-unused,, libgo)
  11 AC_CONFIG_SRCDIR(Makefile.am)
  12 AC_CONFIG_HEADER(config.h)
  13
  14 libtool_VERSION=7:0:0
  15 AC_SUBST(libtool_VERSION)
  16
  17 AM_ENABLE_MULTILIB(, ..)
  18
  19 AC_CANONICAL_SYSTEM
  20 target_alias=${target_alias-$host_alias}
  21
  22 AM_INIT_AUTOMAKE([1.9.3 no-define foreign no-dist -Wall -Wno-portability])
  23 AH_TEMPLATE(PACKAGE, [Name of package])
  24 AH_TEMPLATE(VERSION, [Version number of package])
  25
  26 m4_rename([_AC_ARG_VAR_PRECIOUS],[glibgo_PRECIOUS])
  27 m4_define([_AC_ARG_VAR_PRECIOUS],[])
  28 AC_PROG_CC
  29 AC_PROG_GO
  30 m4_rename_force([glibgo_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
  31
  32 AC_SUBST(CFLAGS)
  33
  34 AM_MAINTAINER_MODE
  35
  36 AC_PROG_LD
  37 AC_PROG_RANLIB
  38 AC_CHECK_TOOL(OBJCOPY, objcopy, missing-objcopy)
  39
  40 AC_LIBTOOL_DLOPEN
  41 AM_PROG_LIBTOOL
  42 AC_SUBST(enable_shared)
  43 AC_SUBST(enable_static)
  44
  45 CC_FOR_BUILD=${CC_FOR_BUILD:-gcc}
  46 AC_SUBST(CC_FOR_BUILD)
  47
  48 AC_PROG_AWK
  49
  50 WARN_FLAGS='-Wall -Wextra -Wwrite-strings -Wcast-qual'
  51 AC_SUBST(WARN_FLAGS)
  52
  53 AC_ARG_ENABLE(werror, [AS_HELP_STRING([--enable-werror],
  54                                       [turns on -Werror @<:@default=yes@:>@])])
  55 if test "x$enable_werror" != "xno"; then
  56   WERROR="-Werror"
  57 fi
  58 AC_SUBST(WERROR)
  59
  60 glibgo_toolexecdir=no
  61 glibgo_toolexeclibdir=no
  62
  63 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
  64 AC_ARG_ENABLE([version-specific-runtime-libs],
  65   AC_HELP_STRING([--enable-version-specific-runtime-libs],
  66                  [Specify that runtime libraries should be installed in a compiler-specific directory]),
  67   [case "$enableval" in
  68     yes) version_specific_libs=yes ;;
  69     no)  version_specific_libs=no ;;
  70     *)   AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
  71    esac],
  72   [version_specific_libs=no])
  73 AC_MSG_RESULT($version_specific_libs)
  74
  75 # Version-specific runtime libs processing.
  76 if test $version_specific_libs = yes; then
  77   glibgo_toolexecdir='${libdir}/gcc/${host_alias}'
  78   glibgo_toolexeclibdir='${toolexecdir}/${gcc_version}$(MULTISUBDIR)'
  79 fi
  80
  81 # Calculate glibgo_toolexecdir, glibgo_toolexeclibdir
  82 # Install a library built with a cross compiler in tooldir, not libdir.
  83 if test -n "$with_cross_host" &&
  84    test x"$with_cross_host" != x"no"; then
  85   nover_glibgo_toolexecdir='${exec_prefix}/${host_alias}'
  86   nover_glibgo_toolexeclibdir='${toolexecdir}/lib'
  87 else
  88   nover_glibgo_toolexecdir='${libdir}/gcc/${host_alias}'
  89   nover_glibgo_toolexeclibdir='${libdir}'
  90 fi
  91 multi_os_directory=`$GOC -print-multi-os-directory`
  92 case $multi_os_directory in
  93   .) ;; # Avoid trailing /.
  94   *) nover_glibgo_toolexeclibdir=${nover_glibgo_toolexeclibdir}/${multi_os_directory} ;;
  95 esac
  96
  97 if test x"$glibgo_toolexecdir" = x"no"; then
  98   glibgo_toolexecdir="${nover_glibgo_toolexecdir}"
  99   glibgo_toolexeclibdir="${nover_glibgo_toolexeclibdir}"
 100 fi
 101
 102 AC_SUBST(glibgo_toolexecdir)
 103 AC_SUBST(glibgo_toolexeclibdir)
 104 AC_SUBST(nover_glibgo_toolexeclibdir)
 105
 106 # See if the user wants to configure without libffi.  Some
 107 # architectures don't support it.  FIXME: We should set a default
 108 # based on the host.
 109 AC_ARG_WITH(libffi,
 110   AS_HELP_STRING([--without-libffi],
 111                  [don't use libffi]),
 112   [:],
 113   [with_libffi=${with_libffi_default-yes}])
 114
 115 LIBFFI=
 116 LIBFFIINCS=
 117 if test "$with_libffi" != no; then
 118    AC_DEFINE(USE_LIBFFI, 1, [Define if we're to use libffi.])
 119    LIBFFI=../libffi/libffi_convenience.la
 120    LIBFFIINCS='-I$(top_srcdir)/../libffi/include -I../libffi/include'
 121 fi
 122 AC_SUBST(LIBFFI)
 123 AC_SUBST(LIBFFIINCS)
 124
 125 # See if the user wants to configure without libatomic. This is useful if we are
 126 # on an architecture for which libgo does not need an atomic support library and
 127 # libatomic does not support our C compiler.
 128 AC_ARG_WITH(libatomic,
 129   AS_HELP_STRING([--without-libatomic],
 130                  [don't use libatomic]),
 131   [:],
 132   [with_libatomic=${with_libatomic_default-yes}])
 133
 134 LIBATOMIC=
 135 if test "$with_libatomic" != no; then
 136    LIBATOMIC=../libatomic/libatomic_convenience.la
 137 fi
 138 AC_SUBST(LIBATOMIC)
 139
 140 # Used to tell GNU make to include a file without telling automake to
 141 # include it.
 142 go_include="-include"
 143 AC_SUBST(go_include)
 144
 145 is_darwin=no
 146 is_freebsd=no
 147 is_irix=no
 148 is_linux=no
 149 is_netbsd=no
 150 is_openbsd=no
 151 is_dragonfly=no
 152 is_rtems=no
 153 is_solaris=no
 154 GOOS=unknown
 155 case ${host} in
 156   *-*-darwin*)   is_darwin=yes;  GOOS=darwin ;;
 157   *-*-freebsd*)  is_freebsd=yes; GOOS=freebsd ;;
 158   *-*-irix6*)    is_irix=yes;    GOOS=irix ;;
 159   *-*-linux*)    is_linux=yes;   GOOS=linux ;;
 160   *-*-netbsd*)   is_netbsd=yes;  GOOS=netbsd ;;
 161   *-*-openbsd*)  is_openbsd=yes; GOOS=openbsd ;;
 162   *-*-dragonfly*) is_dragonfly=yes; GOOS=dragonfly ;;
 163   *-*-rtems*)    is_rtems=yes;   GOOS=rtems ;;
 164   *-*-solaris2*) is_solaris=yes; GOOS=solaris ;;
 165 esac
 166 AM_CONDITIONAL(LIBGO_IS_DARWIN, test $is_darwin = yes)
 167 AM_CONDITIONAL(LIBGO_IS_FREEBSD, test $is_freebsd = yes)
 168 AM_CONDITIONAL(LIBGO_IS_IRIX, test $is_irix = yes)
 169 AM_CONDITIONAL(LIBGO_IS_LINUX, test $is_linux = yes)
 170 AM_CONDITIONAL(LIBGO_IS_NETBSD, test $is_netbsd = yes)
 171 AM_CONDITIONAL(LIBGO_IS_OPENBSD, test $is_openbsd = yes)
 172 AM_CONDITIONAL(LIBGO_IS_DRAGONFLY, test $is_dragonfly = yes)
 173 AM_CONDITIONAL(LIBGO_IS_RTEMS, test $is_rtems = yes)
 174 AM_CONDITIONAL(LIBGO_IS_SOLARIS, test $is_solaris = yes)
 175 AC_SUBST(GOOS)
 176
 177 dnl Test whether we need to use DejaGNU or whether we can use the
 178 dnl simpler gotest approach.  We can only use gotest for a native
 179 dnl build.
 180 USE_DEJAGNU=no
 181 case ${host} in
 182   *-*-rtems*) USE_DEJAGNU=yes ;;
 183   ${build}) ;;
 184   *) USE_DEJAGNU=yes ;;
 185 esac
 186 AC_SUBST(USE_DEJAGNU)
 187
 188 dnl N.B. Keep in sync with gcc/testsuite/go.test/go-test.exp (go-set-goarch).
 189 is_386=no
 190 is_alpha=no
 191 is_arm=no
 192 is_arm64=no
 193 is_m68k=no
 194 mips_abi=unknown
 195 is_ppc=no
 196 is_ppc64=no
 197 is_ppc64le=no
 198 is_s390=no
 199 is_s390x=no
 200 is_sparc=no
 201 is_sparc64=no
 202 is_x86_64=no
 203 GOARCH=unknown
 204 case ${host} in
 205   alpha*-*-*)
 206     is_alpha=yes
 207     GOARCH=alpha
 208     ;;
 209   aarch64-*-*)
 210     is_arm64=yes
 211     GOARCH=arm64
 212     ;;
 213   arm*-*-* | strongarm*-*-* | ep9312*-*-* | xscale-*-*)
 214     is_arm=yes
 215     GOARCH=arm
 216     ;;
 217 changequote(,)dnl
 218   i[34567]86-*-* | x86_64-*-*)
 219 changequote([,])dnl
 220     AC_COMPILE_IFELSE([
 221 #ifdef __x86_64__
 222 #error 64-bit
 223 #endif],
 224 [is_386=yes], [is_x86_64=yes])
 225     if test "$is_386" = "yes"; then
 226       GOARCH=386
 227     else
 228       GOARCH=amd64
 229     fi
 230     ;;
 231   m68k*-*-*)
 232     is_m68k=yes
 233     GOARCH=m68k
 234     ;;
 235   mips*-*-*)
 236     AC_COMPILE_IFELSE([
 237 #if _MIPS_SIM != _ABIO32
 238 #error not o32
 239 #endif],
 240 [mips_abi="o32"],
 241         [AC_COMPILE_IFELSE([
 242 #if _MIPS_SIM != _ABIN32
 243 #error not n32
 244 #endif],
 245 [mips_abi="n32"],
 246         [AC_COMPILE_IFELSE([
 247 #if _MIPS_SIM != _ABI64
 248 #error not n64
 249 #endif],
 250 [mips_abi="n64"],
 251         [AC_COMPILE_IFELSE([
 252 #if _MIPS_SIM != _ABIO64
 253 #error not o64
 254 #endif],
 255 [mips_abi="o64"],
 256         [AC_MSG_ERROR([unknown MIPS ABI])
 257 [mips_abi="n32"]])])])])
 258     case "$mips_abi" in
 259     "o32") GOARCH=mipso32 ;;
 260     "n32") GOARCH=mipsn32 ;;
 261     "n64") GOARCH=mipsn64 ;;
 262     "o64") GOARCH=mipso64 ;;
 263     esac
 264     ;;
 265   rs6000*-*-* | powerpc*-*-*)
 266     AC_COMPILE_IFELSE([
 267 #ifdef _ARCH_PPC64
 268 #error 64-bit
 269 #endif],
 270 [is_ppc=yes],
 271     [AC_COMPILE_IFELSE([
 272 #if defined(_BIG_ENDIAN) || defined(__BIG_ENDIAN__)
 273 #error 64be
 274 #endif],
 275 [is_ppc64le=yes],[is_ppc64=yes])])
 276     if test "$is_ppc" = "yes"; then
 277       GOARCH=ppc
 278     elif test "$is_ppc64" = "yes"; then
 279       GOARCH=ppc64
 280     else
 281       GOARCH=ppc64le
 282     fi
 283     ;;
 284   s390*-*-*)
 285     AC_COMPILE_IFELSE([
 286 #if defined(__s390x__)
 287 #error 64-bit
 288 #endif],
 289 [is_s390=yes], [is_s390x=yes])
 290     if test "$is_s390" = "yes"; then
 291       GOARCH=s390
 292     else
 293       GOARCH=s390x
 294     fi
 295     ;;
 296   sparc*-*-*)
 297     AC_COMPILE_IFELSE([
 298 #if defined(__sparcv9) || defined(__arch64__)
 299 #error 64-bit
 300 #endif],
 301 [is_sparc=yes], [is_sparc64=yes])
 302     if test "$is_sparc" = "yes"; then
 303       GOARCH=sparc
 304     else
 305       GOARCH=sparc64
 306     fi
 307     ;;
 308 esac
 309 AM_CONDITIONAL(LIBGO_IS_386, test $is_386 = yes)
 310 AM_CONDITIONAL(LIBGO_IS_ALPHA, test $is_alpha = yes)
 311 AM_CONDITIONAL(LIBGO_IS_ARM, test $is_arm = yes)
 312 AM_CONDITIONAL(LIBGO_IS_ARM64, test $is_arm64 = yes)
 313 AM_CONDITIONAL(LIBGO_IS_M68K, test $is_m68k = yes)
 314 AM_CONDITIONAL(LIBGO_IS_MIPS, test $mips_abi != unknown)
 315 AM_CONDITIONAL(LIBGO_IS_MIPSO32, test $mips_abi = o32)
 316 AM_CONDITIONAL(LIBGO_IS_MIPSN32, test $mips_abi = n32)
 317 AM_CONDITIONAL(LIBGO_IS_MIPSN64, test $mips_abi = n64)
 318 AM_CONDITIONAL(LIBGO_IS_MIPSO64, test $mips_abi = o64)
 319 AM_CONDITIONAL(LIBGO_IS_PPC, test $is_ppc = yes)
 320 AM_CONDITIONAL(LIBGO_IS_PPC64, test $is_ppc64 = yes)
 321 AM_CONDITIONAL(LIBGO_IS_PPC64LE, test $is_ppc64le = yes)
 322 AM_CONDITIONAL(LIBGO_IS_S390, test $is_s390 = yes)
 323 AM_CONDITIONAL(LIBGO_IS_S390X, test $is_s390x = yes)
 324 AM_CONDITIONAL(LIBGO_IS_SPARC, test $is_sparc = yes)
 325 AM_CONDITIONAL(LIBGO_IS_SPARC64, test $is_sparc64 = yes)
 326 AM_CONDITIONAL(LIBGO_IS_X86_64, test $is_x86_64 = yes)
 327 AC_SUBST(GOARCH)
 328
 329 dnl Some files are only present when needed for specific architectures.
 330 GO_LIBCALL_OS_FILE=
 331 GO_LIBCALL_OS_ARCH_FILE=
 332 GO_SYSCALL_OS_FILE=
 333 GO_SYSCALL_OS_ARCH_FILE=
 334 if test -f "${srcdir}/go/syscall/libcall_${GOOS}.go"; then
 335   GO_LIBCALL_OS_FILE="go/syscall/libcall_${GOOS}.go"
 336 fi
 337 if test -f "${srcdir}/go/syscall/libcall_${GOOS}_${GOARCH}.go"; then
 338   GO_LIBCALL_OS_ARCH_FILE="go/syscall/libcall_${GOOS}_${GOARCH}.go"
 339 fi
 340 if test -f "${srcdir}/go/syscall/syscall_${GOOS}.go"; then
 341   GO_SYSCALL_OS_FILE="go/syscall/syscall_${GOOS}.go"
 342 fi
 343 if test -f "${srcdir}/go/syscall/syscall_${GOOS}_${GOARCH}.go"; then
 344   GO_SYSCALL_OS_ARCH_FILE="go/syscall/syscall_${GOOS}_${GOARCH}.go"
 345 fi
 346 AC_SUBST(GO_LIBCALL_OS_FILE)
 347 AC_SUBST(GO_LIBCALL_OS_ARCH_FILE)
 348 AC_SUBST(GO_SYSCALL_OS_FILE)
 349 AC_SUBST(GO_SYSCALL_OS_ARCH_FILE)
 350
 351 dnl Special flags used to generate sysinfo.go.
 352 OSCFLAGS="-D_GNU_SOURCE -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
 353 case "$target" in
 354     mips-sgi-irix6.5*)
 355         # IRIX 6 needs _XOPEN_SOURCE=500 for the XPG5 version of struct
 356         # msghdr in <sys/socket.h>.
 357         OSCFLAGS="$OSCFLAGS -D_XOPEN_SOURCE=500"
 358         ;;
 359     *-*-solaris2.1[[01]])
 360         # Solaris 10+ needs this so struct msghdr gets the msg_control
 361         # etc. fields in <sys/socket.h> (_XPG4_2).  _XOPEN_SOURCE=600 as
 362         # above doesn't work with C99.
 363         OSCFLAGS="$OSCFLAGS -std=gnu99 -D_XOPEN_SOURCE=600 -D__EXTENSIONS__"
 364         ;;
 365 esac
 366 AC_SUBST(OSCFLAGS)
 367
 368 dnl Use -fsplit-stack when compiling C code if available.
 369 AC_CACHE_CHECK([whether -fsplit-stack is supported],
 370 [libgo_cv_c_split_stack_supported],
 371 [CFLAGS_hold=$CFLAGS
 372 CFLAGS="$CFLAGS -fsplit-stack"
 373 AC_COMPILE_IFELSE([[int i;]],
 374 [libgo_cv_c_split_stack_supported=yes],
 375 [libgo_cv_c_split_stack_supported=no])
 376 CFLAGS=$CFLAGS_hold])
 377 if test "$libgo_cv_c_split_stack_supported" = yes; then
 378   SPLIT_STACK=-fsplit-stack
 379   AC_DEFINE(USING_SPLIT_STACK, 1,
 380                 [Define if the compiler supports -fsplit-stack])
 381 else
 382   SPLIT_STACK=
 383 fi
 384 AC_SUBST(SPLIT_STACK)
 385 AM_CONDITIONAL(USING_SPLIT_STACK,
 386         test "$libgo_cv_c_split_stack_supported" = yes)
 387
 388 dnl Check whether the linker does stack munging when calling from
 389 dnl split-stack into non-split-stack code.  We check this by looking
 390 dnl at the --help output.  FIXME: This is only half right: it's
 391 dnl possible for the linker to support this for some targets but not
 392 dnl others.
 393 AC_CACHE_CHECK([whether linker supports split stack],
 394 [libgo_cv_c_linker_supports_split_stack],
 395 [libgo_cv_c_linker_supports_split_stack=no
 396 if $GOC -Wl,--help 2>/dev/null | grep split-stack-adjust-size >/dev/null 2>&1; then
 397   libgo_cv_c_linker_supports_split_stack=yes
 398 fi])
 399 if test "$libgo_cv_c_linker_supports_split_stack" = yes; then
 400   AC_DEFINE(LINKER_SUPPORTS_SPLIT_STACK, 1,
 401             [Define if the linker support split stack adjustments])
 402 fi
 403
 404 AC_CACHE_CHECK([whether compiler is llgo],
 405 [libgo_cv_c_goc_is_llgo],
 406 [libgo_cv_c_goc_is_llgo=no
 407 if $GOC -dumpversion 2>/dev/null | grep llgo >/dev/null 2>&1; then
 408   libgo_cv_c_goc_is_llgo=yes
 409 fi])
 410 AM_CONDITIONAL(GOC_IS_LLGO, test "$libgo_cv_c_goc_is_llgo" = yes)
 411
 412 dnl Test for the -lm library.
 413 MATH_LIBS=
 414 AC_CHECK_LIB([m], [sqrt], MATH_LIBS=-lm)
 415 AC_SUBST(MATH_LIBS)
 416
 417 dnl Test for -lsocket and -lnsl.  Copied from libjava/configure.ac.
 418 AC_CACHE_CHECK([for socket libraries], libgo_cv_lib_sockets,
 419   [libgo_cv_lib_sockets=
 420    libgo_check_both=no
 421    AC_CHECK_FUNC(connect, libgo_check_socket=no, libgo_check_socket=yes)
 422    if test "$libgo_check_socket" = "yes"; then
 423      unset ac_cv_func_connect
 424      AC_CHECK_LIB(socket, main, libgo_cv_lib_sockets="-lsocket",
 425                   libgo_check_both=yes)
 426    fi
 427    if test "$libgo_check_both" = "yes"; then
 428      libgo_old_libs=$LIBS
 429      LIBS="$LIBS -lsocket -lnsl"
 430      unset ac_cv_func_accept
 431      AC_CHECK_FUNC(accept,
 432                    [libgo_check_nsl=no
 433                     libgo_cv_lib_sockets="-lsocket -lnsl"])
 434      unset ac_cv_func_accept
 435      LIBS=$libgo_old_libs
 436    fi
 437    unset ac_cv_func_gethostbyname
 438    libgo_old_libs="$LIBS"
 439    AC_CHECK_FUNC(gethostbyname, ,
 440                  [AC_CHECK_LIB(nsl, main,
 441                         [libgo_cv_lib_sockets="$libgo_cv_lib_sockets -lnsl"])])
 442    unset ac_cv_func_gethostbyname
 443    LIBS=$libgo_old_libs
 444 ])
 445 NET_LIBS="$libgo_cv_lib_sockets"
 446 AC_SUBST(NET_LIBS)
 447
 448 dnl Test whether the compiler supports the -pthread option.
 449 AC_CACHE_CHECK([whether -pthread is supported],
 450 [libgo_cv_lib_pthread],
 451 [CFLAGS_hold=$CFLAGS
 452 CFLAGS="$CFLAGS -pthread"
 453 AC_COMPILE_IFELSE([[int i;]],
 454 [libgo_cv_lib_pthread=yes],
 455 [libgo_cv_lib_pthread=no])
 456 CFLAGS=$CFLAGS_hold])
 457 PTHREAD_CFLAGS=
 458 if test "$libgo_cv_lib_pthread" = yes; then
 459   PTHREAD_CFLAGS=-pthread
 460 fi
 461 AC_SUBST(PTHREAD_CFLAGS)
 462
 463 dnl Test for the -lpthread library.
 464 PTHREAD_LIBS=
 465 AC_CHECK_LIB([pthread], [pthread_create], PTHREAD_LIBS=-lpthread)
 466 AC_SUBST(PTHREAD_LIBS)
 467
 468 dnl Test if -lrt is required for sched_yield and/or nanosleep.
 469 AC_SEARCH_LIBS([sched_yield], [rt])
 470 AC_SEARCH_LIBS([nanosleep], [rt])
 471
 472 AC_C_BIGENDIAN
 473
 474 GCC_CHECK_UNWIND_GETIPINFO
 475
 476 AC_ARG_ENABLE(sjlj-exceptions,
 477   AC_HELP_STRING([--enable-sjlj-exceptions],
 478                  [force use of builtin_setjmp for exceptions]),
 479   [case "$enableval" in
 480    yes|no|auto) ;;
 481    *) AC_MSG_ERROR([unknown argument to --enable-sjlj-exceptions]) ;;
 482    esac],
 483   [enable_sjlj_exceptions=auto])
 484
 485 AC_CACHE_CHECK([whether to use setjmp/longjmp exceptions],
 486 [libgo_cv_lib_sjlj_exceptions],
 487 [AC_LANG_CONFTEST(
 488   [AC_LANG_SOURCE([
 489 void bar ();
 490 void clean (int *);
 491 void foo ()
 492 {
 493   int i __attribute__ ((cleanup (clean)));
 494   bar();
 495 }
 496 ])])
 497 CFLAGS_hold=$CFLAGS
 498 CFLAGS="--save-temps -fexceptions"
 499 libgo_cv_lib_sjlj_exceptions=unknown
 500 AS_IF([ac_fn_c_try_compile],
 501   [if grep _Unwind_SjLj_Resume conftest.s >/dev/null 2>&1; then
 502     libgo_cv_lib_sjlj_exceptions=yes
 503   elif grep _Unwind_Resume conftest.s >/dev/null 2>&1; then
 504     libgo_cv_lib_sjlj_exceptions=no
 505   fi])
 506 CFLAGS=$CFLAGS_hold
 507 rm -f conftest*
 508 ])
 509
 510 if test "$enable_sjlj_exceptions" = "auto"; then
 511   enable_sjlj_exceptions=$libgo_cv_lib_sjlj_exceptions
 512 fi
 513
 514 case $enable_sjlj_exceptions in
 515 yes)
 516   AC_DEFINE(LIBGO_SJLJ_EXCEPTIONS, 1,
 517         [Define if the C++ compiler is configured for setjmp/longjmp exceptions.])
 518   ;;
 519 no)
 520   ;;
 521 *)
 522   AC_MSG_ERROR([unable to detect exception model])
 523   ;;
 524 esac
 525
 526 AC_CHECK_HEADERS(sched.h sys/file.h sys/mman.h syscall.h sys/epoll.h sys/inotify.h sys/ptrace.h sys/syscall.h sys/user.h sys/utsname.h sys/select.h sys/socket.h net/if.h net/if_arp.h net/route.h netpacket/packet.h sys/prctl.h sys/mount.h sys/vfs.h sys/statfs.h sys/timex.h sys/sysinfo.h utime.h linux/ether.h linux/fs.h linux/reboot.h netinet/icmp6.h netinet/in_syst.h netinet/ip.h netinet/ip_mroute.h netinet/if_ether.h)
 527
 528 AC_CHECK_HEADERS([linux/filter.h linux/if_addr.h linux/if_ether.h linux/if_tun.h linux/netlink.h linux/rtnetlink.h], [], [],
 529 [#ifdef HAVE_SYS_SOCKET_H
 530 #include <sys/socket.h>
 531 #endif
 532 ])
 533
 534 AC_CACHE_CHECK([whether <ustat.h> can be used],
 535 [libgo_cv_c_ustat_h],
 536 [CFLAGS_hold=$CFLAGS
 537 CFLAGS="$CFLAGS -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE $OSCFLAGS"
 538 AC_COMPILE_IFELSE(
 539 [AC_LANG_SOURCE([
 540 #include <sys/types.h>
 541 #ifdef HAVE_LINUX_FILTER_H
 542 #include <linux/filter.h>
 543 #endif
 544 #include <ustat.h>
 545 ])], [libgo_cv_c_ustat_h=yes], [libgo_cv_c_ustat_h=no])
 546 CFLAGS=$CFLAGS_hold])
 547 if test $libgo_cv_c_ustat_h = yes; then
 548   AC_DEFINE(HAVE_USTAT_H, 1,
 549     [Define to 1 if you have the <ustat.h> header file and it works.])
 550 fi
 551
 552 AM_CONDITIONAL(HAVE_SYS_MMAN_H, test "$ac_cv_header_sys_mman_h" = yes)
 553
 554 AC_CHECK_FUNCS(strerror_r strsignal wait4 mincore setenv unsetenv dl_iterate_phdr)
 555 AM_CONDITIONAL(HAVE_STRERROR_R, test "$ac_cv_func_strerror_r" = yes)
 556 AM_CONDITIONAL(HAVE_WAIT4, test "$ac_cv_func_wait4" = yes)
 557
 558 AC_CHECK_FUNCS(accept4 dup3 epoll_create1 faccessat fallocate fchmodat fchownat futimesat getxattr inotify_add_watch inotify_init inotify_init1 inotify_rm_watch listxattr mkdirat mknodat open64 openat pipe2 removexattr renameat setxattr sync_file_range splice tee unlinkat unshare utimensat)
 559 AC_TYPE_OFF_T
 560 AC_CHECK_TYPES([loff_t])
 561
 562 LIBS_hold="$LIBS"
 563 LIBS="$LIBS -lm"
 564 AC_CHECK_FUNCS(cosl expl logl sinl tanl acosl asinl atanl atan2l expm1l ldexpl log10l log1pl)
 565 LIBS="$LIBS_hold"
 566
 567 CFLAGS_hold="$CFLAGS"
 568 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
 569 LIBS_hold="$LIBS"
 570 LIBS="$LIBS $PTHREAD_LIBS"
 571 AC_CHECK_FUNCS(sem_timedwait)
 572 CFLAGS="$CFLAGS_hold"
 573 LIBS="$LIBS_hold"
 574
 575 LIBS_hold="$LIBS"
 576 LIBS="$LIBS $MATH_LIBS"
 577 AC_CHECK_FUNCS(matherr)
 578 LIBS="$LIBS_hold"
 579
 580 AC_CACHE_CHECK([for __sync_bool_compare_and_swap_4],
 581 [libgo_cv_func___sync_bool_compare_and_swap_4],
 582 [AC_LINK_IFELSE([
 583 typedef unsigned int uint32  __attribute__ ((mode (SI)));
 584 uint32 i;
 585 int main() { return __sync_bool_compare_and_swap (&i, 0, 1); }
 586 ],
 587 [libgo_cv_func___sync_bool_compare_and_swap_4=yes],
 588 [libgo_cv_func___sync_bool_compare_and_swap_4=no])])
 589 if test "$libgo_cv_func___sync_bool_compare_and_swap_4" = "yes"; then
 590   AC_DEFINE(HAVE_SYNC_BOOL_COMPARE_AND_SWAP_4, 1,
 591     [Define to 1 if the compiler provides the __sync_bool_compare_and_swap function for uint32])
 592 fi
 593
 594 AC_CACHE_CHECK([for __sync_bool_compare_and_swap_8],
 595 [libgo_cv_func___sync_bool_compare_and_swap_8],
 596 [AC_LINK_IFELSE([
 597 typedef unsigned int uint64  __attribute__ ((mode (DI)));
 598 uint64 i;
 599 int main() { return __sync_bool_compare_and_swap (&i, 0, 1); }
 600 ],
 601 [libgo_cv_func___sync_bool_compare_and_swap_8=yes],
 602 [libgo_cv_func___sync_bool_compare_and_swap_8=no])])
 603 if test "$libgo_cv_func___sync_bool_compare_and_swap_8" = "yes"; then
 604   AC_DEFINE(HAVE_SYNC_BOOL_COMPARE_AND_SWAP_8, 1,
 605     [Define to 1 if the compiler provides the __sync_bool_compare_and_swap function for uint64])
 606 fi
 607
 608 AC_CACHE_CHECK([for __sync_fetch_and_add_4],
 609 [libgo_cv_func___sync_fetch_and_add_4],
 610 [AC_LINK_IFELSE([
 611 typedef unsigned int uint32  __attribute__ ((mode (SI)));
 612 uint32 i;
 613 int main() { return __sync_fetch_and_add (&i, 1); }
 614 ],
 615 [libgo_cv_func___sync_fetch_and_add_4=yes],
 616 [libgo_cv_func___sync_fetch_and_add_4=no])])
 617 if test "$libgo_cv_func___sync_fetch_and_add_4" = "yes"; then
 618   AC_DEFINE(HAVE_SYNC_FETCH_AND_ADD_4, 1,
 619     [Define to 1 if the compiler provides the __sync_fetch_and_add function for uint32])
 620 fi
 621
 622 AC_CACHE_CHECK([for __sync_add_and_fetch_8],
 623 [libgo_cv_func___sync_add_and_fetch_8],
 624 [AC_LINK_IFELSE([
 625 typedef unsigned int uint64  __attribute__ ((mode (DI)));
 626 uint64 i;
 627 int main() { return __sync_add_and_fetch (&i, 1); }
 628 ],
 629 [libgo_cv_func___sync_add_and_fetch_8=yes],
 630 [libgo_cv_func___sync_add_and_fetch_8=no])])
 631 if test "$libgo_cv_func___sync_add_and_fetch_8" = "yes"; then
 632   AC_DEFINE(HAVE_SYNC_ADD_AND_FETCH_8, 1,
 633     [Define to 1 if the compiler provides the __sync_add_and_fetch function for uint64])
 634 fi
 635
 636 dnl For x86 we want to use the -minline-all-stringops option to avoid
 637 dnl forcing a stack split when calling memcpy and friends.
 638 AC_CACHE_CHECK([whether compiler supports -minline-all-stringops],
 639 [libgo_cv_c_stringops],
 640 [CFLAGS_hold=$CFLAGS
 641 CFLAGS="$CFLAGS -minline-all-stringops"
 642 AC_COMPILE_IFELSE([int i;],
 643 [libgo_cv_c_stringops=yes],
 644 [libgo_cv_c_stringops=no])
 645 CFLAGS=$CFLAGS_hold])
 646 STRINGOPS_FLAG=
 647 if test "$libgo_cv_c_stringops" = yes; then
 648   STRINGOPS_FLAG=-minline-all-stringops
 649 fi
 650 AC_SUBST(STRINGOPS_FLAG)
 651
 652 dnl For x86 we want to compile the math library with -mfancy-math-387
 653 dnl -funsafe-math-optimizations so that we can use the builtin
 654 dnl instructions directly.
 655 AC_CACHE_CHECK([whether compiler supports -mfancy-math-387],
 656 [libgo_cv_c_fancymath],
 657 [CFLAGS_hold=$CFLAGS
 658 CFLAGS="$CFLAGS -mfancy-math-387"
 659 AC_COMPILE_IFELSE([int i;],
 660 [libgo_cv_c_fancymath=yes],
 661 [libgo_cv_c_fancymath=no])
 662 CFLAGS=$CFLAGS_hold])
 663 MATH_FLAG=
 664 if test "$libgo_cv_c_fancymath" = yes; then
 665   MATH_FLAG="-mfancy-math-387 -funsafe-math-optimizations"
 666 else
 667   MATH_FLAG="-ffp-contract=off"
 668 fi
 669 AC_SUBST(MATH_FLAG)
 670
 671 CFLAGS_hold=$CFLAGS
 672 CFLAGS="$CFLAGS -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE"
 673 AC_CHECK_TYPES([off64_t])
 674 CFLAGS=$CFLAGS_hold
 675
 676 dnl Work out the size of the epoll_events struct on GNU/Linux.
 677 AC_CACHE_CHECK([epoll_event size],
 678 [libgo_cv_c_epoll_event_size],
 679 [AC_COMPUTE_INT(libgo_cv_c_epoll_event_size,
 680 [sizeof (struct epoll_event)],
 681 [#include <sys/epoll.h>],
 682 [libgo_cv_c_epoll_event_size=0])])
 683 SIZEOF_STRUCT_EPOLL_EVENT=${libgo_cv_c_epoll_event_size}
 684 AC_SUBST(SIZEOF_STRUCT_EPOLL_EVENT)
 685
 686 dnl Work out the offset of the fd field in the epoll_events struct on
 687 dnl GNU/Linux.
 688 AC_CACHE_CHECK([epoll_event data.fd offset],
 689 [libgo_cv_c_epoll_event_fd_offset],
 690 [AC_COMPUTE_INT(libgo_cv_c_epoll_event_fd_offset,
 691 [offsetof (struct epoll_event, data.fd)],
 692 [#include <stddef.h>
 693 #include <sys/epoll.h>],
 694 [libgo_cv_c_epoll_event_fd_offset=0])])
 695 STRUCT_EPOLL_EVENT_FD_OFFSET=${libgo_cv_c_epoll_event_fd_offset}
 696 AC_SUBST(STRUCT_EPOLL_EVENT_FD_OFFSET)
 697
 698 dnl See if struct exception is defined in <math.h>.
 699 AC_CHECK_TYPE([struct exception],
 700 [libgo_has_struct_exception=yes],
 701 [libgo_has_struct_exception=no],
 702 [#include <math.h>])
 703 if test "$libgo_has_struct_exception" = "yes"; then
 704   AC_DEFINE(HAVE_STRUCT_EXCEPTION, 1,
 705             [Define to 1 if <math.h> defines struct exception])
 706 fi
 707
 708 dnl See whether setcontext changes the value of TLS variables.
 709 AC_CACHE_CHECK([whether setcontext clobbers TLS variables],
 710 [libgo_cv_lib_setcontext_clobbers_tls],
 711 [CFLAGS_hold="$CFLAGS"
 712 CFLAGS="$PTHREAD_CFLAGS"
 713 LIBS_hold="$LIBS"
 714 LIBS="$LIBS $PTHREAD_LIBS"
 715 AC_CHECK_SIZEOF([void *])
 716 AS_VAR_ARITH([ptr_type_size], [$ac_cv_sizeof_void_p \* 8])
 717 AC_RUN_IFELSE(
 718   [AC_LANG_SOURCE([
 719 #include <pthread.h>
 720 #include <stdlib.h>
 721 #include <ucontext.h>
 722 #include <unistd.h>
 723
 724 __thread int tls;
 725
 726 static char stack[[10 * 1024 * 1024]];
 727 static ucontext_t c;
 728
 729 /* Called via makecontext/setcontext.  */
 730
 731 static void
 732 cfn (void)
 733 {
 734   exit (tls);
 735 }
 736
 737 /* Called via pthread_create.  */
 738
 739 static void *
 740 tfn (void *dummy)
 741 {
 742   /* The thread should still see this value after calling
 743      setcontext.  */
 744   tls = 0;
 745
 746   setcontext (&c);
 747
 748   /* The call to setcontext should not return.  */
 749   abort ();
 750 }
 751
 752 int
 753 main ()
 754 {
 755   pthread_t tid;
 756
 757   /* The thread should not see this value.  */
 758   tls = 1;
 759
 760   if (getcontext (&c) < 0)
 761     abort ();
 762
 763   c.uc_stack.ss_sp = stack;
 764 #ifdef MAKECONTEXT_STACK_TOP
 765   c.uc_stack.ss_sp += sizeof stack;
 766 #endif
 767   c.uc_stack.ss_flags = 0;
 768   c.uc_stack.ss_size = sizeof stack;
 769   c.uc_link = NULL;
 770   makecontext (&c, cfn, 0);
 771
 772   if (pthread_create (&tid, NULL, tfn, NULL) != 0)
 773     abort ();
 774
 775   if (pthread_join (tid, NULL) != 0)
 776     abort ();
 777
 778   /* The thread should have called exit.  */
 779   abort ();
 780 }
 781 ])],
 782 [libgo_cv_lib_setcontext_clobbers_tls=no],
 783 [libgo_cv_lib_setcontext_clobbers_tls=yes],
 784 [case "$target:$ptr_type_size" in
 785   i?86-*-solaris2.1[[01]]:64 | x86_64*-*-solaris2.1[[01]]:64)
 786     libgo_cv_lib_setcontext_clobbers_tls=yes ;;
 787   *)
 788     libgo_cv_lib_setcontext_clobbers_tls=no ;;
 789  esac
 790 ])
 791 CFLAGS="$CFLAGS_hold"
 792 LIBS="$LIBS_hold"
 793 ])
 794 if test "$libgo_cv_lib_setcontext_clobbers_tls" = "yes"; then
 795   AC_DEFINE(SETCONTEXT_CLOBBERS_TLS, 1,
 796             [Define if setcontext clobbers TLS variables])
 797 fi
 798
 799 AC_CACHE_CHECK([whether .eh_frame section should be read-only],
 800 libgo_cv_ro_eh_frame, [
 801 libgo_cv_ro_eh_frame=no
 802 echo 'extern void foo (void); void bar (void) { foo (); foo (); }' > conftest.c
 803 if $CC $CFLAGS -S -fpic -fexceptions -o conftest.s conftest.c > /dev/null 2>&1; then
 804   if grep '.section.*eh_frame.*"a"' conftest.s > /dev/null; then
 805     libgo_cv_ro_eh_frame=yes
 806   elif grep '.section.*eh_frame.*#alloc' conftest.c \
 807        | grep -v '#write' > /dev/null; then
 808     libgo_cv_ro_eh_frame=yes
 809   fi
 810 fi
 811 rm -f conftest.*
 812 ])
 813 if test "x$libgo_cv_ro_eh_frame" = xyes; then
 814   AC_DEFINE(EH_FRAME_FLAGS, "a",
 815             [Define to the flags needed for the .section .eh_frame directive.])
 816 else
 817   AC_DEFINE(EH_FRAME_FLAGS, "aw",
 818             [Define to the flags needed for the .section .eh_frame directive.])
 819 fi
 820
 821 AC_CACHE_CHECK([if compiler supports -Qunused-arguments],
 822 [libgo_cv_c_unused_arguments],
 823 [CFLAGS_hold=$CFLAGS
 824 CFLAGS="$CFLAGS -Qunused-arguments"
 825 AC_COMPILE_IFELSE([[int i;]],
 826 [libgo_cv_c_unused_arguments=yes],
 827 [libgo_cv_c_unused_arguments=no])
 828 CFLAGS=$CFLAGS_hold])
 829
 830 AC_CACHE_CHECK([if assembler supports GNU comdat group syntax],
 831 libgo_cv_as_comdat_gnu, [
 832 echo '.section .text,"axG",@progbits,.foo,comdat' > conftest.s
 833 CFLAGS_hold=$CFLAGS
 834 if test "$libgo_cv_c_unused_arguments" = yes; then
 835   CFLAGS="$CFLAGS -Qunused-arguments"
 836 fi
 837 if $CC $CFLAGS -c conftest.s > /dev/null 2>&1; then
 838   libgo_cv_as_comdat_gnu=yes
 839 else
 840   libgo_cv_as_comdat_gnu=no
 841 fi
 842 CFLAGS=$CFLAGS_hold
 843 ])
 844 if test "x$libgo_cv_as_comdat_gnu" = xyes; then
 845   AC_DEFINE(HAVE_AS_COMDAT_GAS, 1,
 846             [Define if your assembler supports GNU comdat group syntax.])
 847 fi
 848
 849 AC_CACHE_CHECK([assembler supports pc related relocs],
 850 libgo_cv_as_x86_pcrel, [
 851 libgo_cv_as_x86_pcrel=yes
 852 echo '.text; foo: nop; .data; .long foo-.; .text' > conftest.s
 853 CFLAGS_hold=$CFLAGS
 854 if test "$libgo_cv_c_unused_arguments" = yes; then
 855   CFLAGS="$CFLAGS -Qunused-arguments"
 856 fi
 857 if $CC $CFLAGS -c conftest.s 2>&1 | $EGREP -i 'illegal|warning' > /dev/null; then
 858     libgo_cv_as_x86_pcrel=no
 859 fi
 860 CFLAGS=$CFLAGS_hold
 861 ])
 862 if test "x$libgo_cv_as_x86_pcrel" = xyes; then
 863   AC_DEFINE(HAVE_AS_X86_PCREL, 1,
 864             [Define if your assembler supports PC relative relocs.])
 865 fi
 866
 867 AC_CACHE_CHECK([assembler supports unwind section type],
 868 libgo_cv_as_x86_64_unwind_section_type, [
 869 libgo_cv_as_x86_64_unwind_section_type=yes
 870 echo '.section .eh_frame,"a",@unwind' > conftest.s
 871 CFLAGS_hold=$CFLAGS
 872 if test "$libgo_cv_c_unused_arguments" = yes; then
 873   CFLAGS="$CFLAGS -Qunused-arguments"
 874 fi
 875 if $CC $CFLAGS -c conftest.s 2>&1 | grep -i warning > /dev/null; then
 876     libgo_cv_as_x86_64_unwind_section_type=no
 877 fi
 878 CFLAGS=$CFLAGS_hold
 879 ])
 880 if test "x$libgo_cv_as_x86_64_unwind_section_type" = xyes; then
 881   AC_DEFINE(HAVE_AS_X86_64_UNWIND_SECTION_TYPE, 1,
 882             [Define if your assembler supports unwind section type.])
 883 fi
 884
 885 AC_CACHE_SAVE
 886
 887 if test ${multilib} = yes; then
 888   multilib_arg="--enable-multilib"
 889 else
 890   multilib_arg=
 891 fi
 892
 893 AC_CONFIG_FILES(Makefile testsuite/Makefile)
 894
 895 AC_CONFIG_COMMANDS([default],
 896 [if test -n "$CONFIG_FILES"; then
 897    # Multilibs need MULTISUBDIR defined correctly in certain makefiles so
 898    # that multilib installs will end up installed in the correct place.
 899    # The testsuite needs it for multilib-aware ABI baseline files.
 900    # To work around this not being passed down from config-ml.in ->
 901    # srcdir/Makefile.am -> srcdir/{src,libsupc++,...}/Makefile.am, manually
 902    # append it here.  Only modify Makefiles that have just been created.
 903    #
 904    # Also, get rid of this simulated-VPATH thing that automake does.
 905    cat > vpsed << \_EOF
 906 s!`test -f '$<' || echo '$(srcdir)/'`!!
 907 _EOF
 908    for i in $SUBDIRS; do
 909     case $CONFIG_FILES in
 910      *${i}/Makefile*)
 911        #echo "Adding MULTISUBDIR to $i/Makefile"
 912        sed -f vpsed $i/Makefile > tmp
 913        grep '^MULTISUBDIR =' Makefile >> tmp
 914        mv tmp $i/Makefile
 915        ;;
 916     esac
 917    done
 918    rm vpsed
 919  fi
 920 ],
 921 [
 922 # Variables needed in config.status (file generation) which aren't already
 923 # passed by autoconf.
 924 SUBDIRS="$SUBDIRS"
 925 ])
 926
 927 AC_OUTPUT