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dnl ----------------------------------------------------------------------

dnl This whole bit snagged from libgfortran.

dnl Check whether the target supports __sync_*_compare_and_swap.

AC_DEFUN([LIBGOMP_CHECK_SYNC_BUILTINS], [

  AC_CACHE_CHECK([whether the target supports __sync_*_compare_and_swap],

                 have_sync_builtins, [

  AC_TRY_LINK([], [int foo, bar; bar = __sync_val_compare_and_swap(&foo, 0, 1);],

              have_sync_builtins=yes, have_sync_builtins=no)])

  if test $have_sync_builtins = yes; then

    AC_DEFINE(HAVE_SYNC_BUILTINS, 1,

              [Define to 1 if the target supports __sync_*_compare_and_swap])

  fi])

dnl Check whether the target supports hidden visibility.

AC_DEFUN([LIBGOMP_CHECK_ATTRIBUTE_VISIBILITY], [

  AC_CACHE_CHECK([whether the target supports hidden visibility],

                 have_attribute_visibility, [

  save_CFLAGS="$CFLAGS"

  CFLAGS="$CFLAGS -Werror"

  AC_TRY_COMPILE([void __attribute__((visibility("hidden"))) foo(void) { }],

                 [], have_attribute_visibility=yes,

                 have_attribute_visibility=no)

  CFLAGS="$save_CFLAGS"])

  if test $have_attribute_visibility = yes; then

    AC_DEFINE(HAVE_ATTRIBUTE_VISIBILITY, 1,

      [Define to 1 if the target supports __attribute__((visibility(...))).])

  fi])

dnl Check whether the target supports dllexport

AC_DEFUN([LIBGOMP_CHECK_ATTRIBUTE_DLLEXPORT], [

  AC_CACHE_CHECK([whether the target supports dllexport],

                 have_attribute_dllexport, [

  save_CFLAGS="$CFLAGS"

  CFLAGS="$CFLAGS -Werror"

  AC_TRY_COMPILE([void __attribute__((dllexport)) foo(void) { }],

                 [], have_attribute_dllexport=yes,

                 have_attribute_dllexport=no)

  CFLAGS="$save_CFLAGS"])

  if test $have_attribute_dllexport = yes; then

    AC_DEFINE(HAVE_ATTRIBUTE_DLLEXPORT, 1,

      [Define to 1 if the target supports __attribute__((dllexport)).])

  fi])

dnl Check whether the target supports symbol aliases.

AC_DEFUN([LIBGOMP_CHECK_ATTRIBUTE_ALIAS], [

  AC_CACHE_CHECK([whether the target supports symbol aliases],

                 have_attribute_alias, [

  AC_TRY_LINK([

void foo(void) { }

extern void bar(void) __attribute__((alias("foo")));],

    [bar();], have_attribute_alias=yes, have_attribute_alias=no)])

  if test $have_attribute_alias = yes; then

    AC_DEFINE(HAVE_ATTRIBUTE_ALIAS, 1,

      [Define to 1 if the target supports __attribute__((alias(...))).])

  fi])

sinclude(../libtool.m4)

dnl The lines below arrange for aclocal not to bring an installed

dnl libtool.m4 into aclocal.m4, while still arranging for automake to

dnl add a definition of LIBTOOL to Makefile.in.

ifelse(,,,[AC_SUBST(LIBTOOL)

AC_DEFUN([AM_PROG_LIBTOOL])

AC_DEFUN([AC_LIBTOOL_DLOPEN])

AC_DEFUN([AC_PROG_LD])

])

dnl ----------------------------------------------------------------------

dnl This whole bit snagged from libstdc++-v3.

dnl

dnl LIBGOMP_ENABLE

dnl    (FEATURE, DEFAULT, HELP-ARG, HELP-STRING)

dnl    (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, permit a|b|c)

dnl    (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, SHELL-CODE-HANDLER)

dnl

dnl See docs/html/17_intro/configury.html#enable for documentation.

dnl

m4_define([LIBGOMP_ENABLE],[dnl

m4_define([_g_switch],[--enable-$1])dnl

m4_define([_g_help],[AC_HELP_STRING(_g_switch$3,[$4 @<:@default=$2@:>@])])dnl

 AC_ARG_ENABLE($1,_g_help,

  m4_bmatch([$5],

   [^permit ],

     [[

      case "$enableval" in

       m4_bpatsubst([$5],[permit ])) ;;

       *) AC_MSG_ERROR(Unknown argument to enable/disable $1) ;;

          dnl Idea for future:  generate a URL pointing to

          dnl "onlinedocs/configopts.html#whatever"

      esac

     ]],

   [^$],

     [[

      case "$enableval" in

       yes|no) ;;

       *) AC_MSG_ERROR(Argument to enable/disable $1 must be yes or no) ;;

      esac

     ]],

   [[$5]]),

  [enable_]m4_bpatsubst([$1],-,_)[=][$2])

m4_undefine([_g_switch])dnl

m4_undefine([_g_help])dnl

])

dnl

dnl If GNU ld is in use, check to see if tricky linker opts can be used.  If

dnl the native linker is in use, all variables will be defined to something

dnl safe (like an empty string).

dnl

dnl Defines:

dnl  SECTION_LDFLAGS='-Wl,--gc-sections' if possible

dnl  OPT_LDFLAGS='-Wl,-O1' if possible

dnl  LD (as a side effect of testing)

dnl Sets:

dnl  with_gnu_ld

dnl  libgomp_gnu_ld_version (possibly)

dnl

dnl The last will be a single integer, e.g., version 1.23.45.0.67.89 will

dnl set libgomp_gnu_ld_version to 12345.  Zeros cause problems.

dnl

AC_DEFUN([LIBGOMP_CHECK_LINKER_FEATURES], [

  # If we're not using GNU ld, then there's no point in even trying these

  # tests.  Check for that first.  We should have already tested for gld

  # by now (in libtool), but require it now just to be safe...

  test -z "$SECTION_LDFLAGS" && SECTION_LDFLAGS=''

  test -z "$OPT_LDFLAGS" && OPT_LDFLAGS=''

  AC_REQUIRE([AC_PROG_LD])

  AC_REQUIRE([AC_PROG_AWK])

  # The name set by libtool depends on the version of libtool.  Shame on us

  # for depending on an impl detail, but c'est la vie.  Older versions used

  # ac_cv_prog_gnu_ld, but now it's lt_cv_prog_gnu_ld, and is copied back on

  # top of with_gnu_ld (which is also set by --with-gnu-ld, so that actually

  # makes sense).  We'll test with_gnu_ld everywhere else, so if that isn't

  # set (hence we're using an older libtool), then set it.

  if test x${with_gnu_ld+set} != xset; then

    if test x${ac_cv_prog_gnu_ld+set} != xset; then

      # We got through "ac_require(ac_prog_ld)" and still not set?  Huh?

      with_gnu_ld=no

    else

      with_gnu_ld=$ac_cv_prog_gnu_ld

    fi

  fi

  # Start by getting the version number.  I think the libtool test already

  # does some of this, but throws away the result.

  changequote(,)

  ldver=`$LD --version 2>/dev/null | head -1 | \

         sed -e 's/GNU ld \(version \)\{0,1\}\(([^)]*) \)\{0,1\}\([0-9.][0-9.]*\).*/\3/'`

  changequote([,])

  libgomp_gnu_ld_version=`echo $ldver | \

         $AWK -F. '{ if (NF<3) [$]3=0; print ([$]1*100+[$]2)*100+[$]3 }'`

  # Set --gc-sections.

  if test "$with_gnu_ld" = "notbroken"; then

    # GNU ld it is!  Joy and bunny rabbits!

    # All these tests are for C++; save the language and the compiler flags.

    # Need to do this so that g++ won't try to link in libstdc++

    ac_test_CFLAGS="${CFLAGS+set}"

    ac_save_CFLAGS="$CFLAGS"

    CFLAGS='-x c++  -Wl,--gc-sections'

    # Check for -Wl,--gc-sections

    # XXX This test is broken at the moment, as symbols required for linking

    # are now in libsupc++ (not built yet).  In addition, this test has

    # cored on solaris in the past.  In addition, --gc-sections doesn't

    # really work at the moment (keeps on discarding used sections, first

    # .eh_frame and now some of the glibc sections for iconv).

    # Bzzzzt.  Thanks for playing, maybe next time.

    AC_MSG_CHECKING([for ld that supports -Wl,--gc-sections])

    AC_TRY_RUN([

     int main(void)

     {

       try { throw 1; }

       catch (...) { };

       return 0;

     }

    ], [ac_sectionLDflags=yes],[ac_sectionLDflags=no], [ac_sectionLDflags=yes])

    if test "$ac_test_CFLAGS" = set; then

      CFLAGS="$ac_save_CFLAGS"

    else

      # this is the suspicious part

      CFLAGS=''

    fi

    if test "$ac_sectionLDflags" = "yes"; then

      SECTION_LDFLAGS="-Wl,--gc-sections $SECTION_LDFLAGS"

    fi

    AC_MSG_RESULT($ac_sectionLDflags)

  fi

  # Set linker optimization flags.

  if test x"$with_gnu_ld" = x"yes"; then

    OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"

  fi

  AC_SUBST(SECTION_LDFLAGS)

  AC_SUBST(OPT_LDFLAGS)

])

dnl

dnl Add version tags to symbols in shared library (or not), additionally

dnl marking other symbols as private/local (or not).

dnl

dnl --enable-symvers=style adds a version script to the linker call when

dnl       creating the shared library.  The choice of version script is

dnl       controlled by 'style'.

dnl --disable-symvers does not.

dnl  +  Usage:  LIBGOMP_ENABLE_SYMVERS[(DEFAULT)]

dnl       Where DEFAULT is either 'yes' or 'no'.  Passing `yes' tries to

dnl       choose a default style based on linker characteristics.  Passing

dnl       'no' disables versioning.

dnl

AC_DEFUN([LIBGOMP_ENABLE_SYMVERS], [

LIBGOMP_ENABLE(symvers,yes,[=STYLE],

  [enables symbol versioning of the shared library],

  [permit yes|no|gnu])

# If we never went through the LIBGOMP_CHECK_LINKER_FEATURES macro, then we

# don't know enough about $LD to do tricks...

AC_REQUIRE([LIBGOMP_CHECK_LINKER_FEATURES])

# FIXME  The following test is too strict, in theory.

if test $enable_shared = no ||

        test "x$LD" = x ||

        test x$libgomp_gnu_ld_version = x; then

  enable_symvers=no

fi

# Check to see if libgcc_s exists, indicating that shared libgcc is possible.

if test $enable_symvers != no; then

  AC_MSG_CHECKING([for shared libgcc])

  ac_save_CFLAGS="$CFLAGS"

  CFLAGS=' -lgcc_s'

  AC_TRY_LINK(, [return 0;], libgomp_shared_libgcc=yes, libgomp_shared_libgcc=no)

  CFLAGS="$ac_save_CFLAGS"

  if test $libgomp_shared_libgcc = no; then

    cat > conftest.c <<EOF

int main (void) { return 0; }

EOF

changequote(,)dnl

    libgomp_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \

                             -shared -shared-libgcc -o conftest.so \

                             conftest.c -v 2>&1 >/dev/null \

                             | sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'`

changequote([,])dnl

    rm -f conftest.c conftest.so

    if test x${libgomp_libgcc_s_suffix+set} = xset; then

      CFLAGS=" -lgcc_s$libgomp_libgcc_s_suffix"

      AC_TRY_LINK(, [return 0;], libgomp_shared_libgcc=yes)

      CFLAGS="$ac_save_CFLAGS"

    fi

  fi

  AC_MSG_RESULT($libgomp_shared_libgcc)

fi

# For GNU ld, we need at least this version.  The format is described in

# LIBGOMP_CHECK_LINKER_FEATURES above.

libgomp_min_gnu_ld_version=21400

# XXXXXXXXXXX libgomp_gnu_ld_version=21390

# Check to see if unspecified "yes" value can win, given results above.

# Change "yes" into either "no" or a style name.

if test $enable_symvers = yes; then

  if test $with_gnu_ld = yes &&

     test $libgomp_shared_libgcc = yes;

  then

    if test $libgomp_gnu_ld_version -ge $libgomp_min_gnu_ld_version ; then

      enable_symvers=gnu

    else

      # The right tools, the right setup, but too old.  Fallbacks?

      AC_MSG_WARN(=== Linker version $libgomp_gnu_ld_version is too old for)

      AC_MSG_WARN(=== full symbol versioning support in this release of GCC.)

      AC_MSG_WARN(=== You would need to upgrade your binutils to version)

      AC_MSG_WARN(=== $libgomp_min_gnu_ld_version or later and rebuild GCC.)

      if test $libgomp_gnu_ld_version -ge 21200 ; then

        # Globbing fix is present, proper block support is not.

        dnl AC_MSG_WARN([=== Dude, you are soooo close.  Maybe we can fake it.])

        dnl enable_symvers=???

        AC_MSG_WARN([=== Symbol versioning will be disabled.])

        enable_symvers=no

      else

        # 2.11 or older.

        AC_MSG_WARN([=== Symbol versioning will be disabled.])

        enable_symvers=no

      fi

    fi

  else

    # just fail for now

    AC_MSG_WARN([=== You have requested some kind of symbol versioning, but])

    AC_MSG_WARN([=== either you are not using a supported linker, or you are])

    AC_MSG_WARN([=== not building a shared libgcc_s (which is required).])

    AC_MSG_WARN([=== Symbol versioning will be disabled.])

    enable_symvers=no

  fi

fi

AM_CONDITIONAL(LIBGOMP_BUILD_VERSIONED_SHLIB, test $enable_symvers != no)

AC_MSG_NOTICE(versioning on shared library symbols is $enable_symvers)

])