hwloc-1.2.1/config/hwloc_check_visibility.m4

# This macro set originally copied from Open MPI:
# Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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# Copyright (c) 2004-2005 The Regents of the University of California.
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# and renamed for hwloc:
# Copyright (c) 2009 INRIA.  All rights reserved.
# Copyright (c) 2009-2010 Université Bordeaux 1
# Copyright (c) 2010 Cisco Systems, Inc.  All rights reserved.
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# _HWLOC_CHECK_VISIBILITY
# --------------------------------------------------------
AC_DEFUN([_HWLOC_CHECK_VISIBILITY],[
    # Be safe for systems that have ancient Autoconf's (e.g., RHEL5)
    m4_ifdef([AC_PROG_GREP], 
             [AC_REQUIRE([AC_PROG_GREP])],
             [GREP=grep])

    msg="whether to enable visibility"
    # Check if the compiler has support for visibility, like some
    # versions of gcc, icc.
    AC_ARG_ENABLE(visibility, 
        AC_HELP_STRING([--enable-visibility],
            [enable visibility feature of certain compilers/linkers (default: enabled)]))

    case ${target} in
      *-*-aix*|*-*-mingw*|*-*-cygwin*|*-*-hpux*)
        enable_visibility=no
        ;;
    esac

    if test "$enable_visibility" = "no"; then
        AC_MSG_CHECKING([$msg])
        AC_MSG_RESULT([no (disabled)]) 
        have_visibility=0
    else
        CFLAGS_orig="$CFLAGS"
        CFLAGS="$CFLAGS_orig -fvisibility=hidden"
        hwloc_add=
        AC_CACHE_CHECK([if $CC supports -fvisibility],
            [hwloc_cv_cc_fvisibility],
            [AC_LINK_IFELSE([AC_LANG_PROGRAM([[
                    __attribute__((visibility("default"))) int foo;
                    ]],[[int i;]])],
                    [hwloc_cv_cc_fvisibility=yes],
                    [if test -s conftest.err ; then
                        $GREP -iq "visibility" conftest.err
                        if test "$?" = "0" ; then
                            hwloc_cv_cc_fvisibility=no
                        else
                            hwloc_cv_cc_fvisibility=yes
                        fi
                     else
                        hwloc_cv_cc_fvisibility=yes
                     fi],
                    [hwloc_cv_cc_fvisibility=no])
                ])

        if test "$hwloc_cv_cc_fvisibility" = "yes" ; then
            hwloc_add=" -fvisibility=hidden"
            have_visibility=1
            AC_MSG_CHECKING([$msg])
            AC_MSG_RESULT([yes (via$hwloc_add)]) 
        elif test "$enable_visibility" = "yes"; then
            AC_MSG_ERROR([Symbol visibility support requested but compiler does not seem to support it.  Aborting])
        else 
            AC_MSG_CHECKING([$msg])
            AC_MSG_RESULT([no (unsupported)]) 
            have_visibility=0
        fi
        CFLAGS=$CFLAGS_orig
        HWLOC_VISIBILITY_CFLAGS=$hwloc_add
        unset hwloc_add 
    fi

    AC_DEFINE_UNQUOTED([HWLOC_C_HAVE_VISIBILITY], [$have_visibility],
            [Whether C compiler supports -fvisibility])
])