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openmpi/config/ompi_check_visibility.m4

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# -*- shell-script -*-
#
# Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
# University Research and Technology
# Corporation. All rights reserved.
# Copyright (c) 2004-2005 The University of Tennessee and The University
# of Tennessee Research Foundation. All rights
# reserved.
# Copyright (c) 2004-2007 High Performance Computing Center Stuttgart,
# University of Stuttgart. All rights reserved.
# Copyright (c) 2004-2005 The Regents of the University of California.
# All rights reserved.
# Copyright (c) 2006-2007 Cisco Systems, Inc. All rights reserved.
# $COPYRIGHT$
#
# Additional copyrights may follow
#
# $HEADER$
#
# OMPI_CHECK_VISIBILITY
# --------------------------------------------------------
AC_DEFUN([OMPI_CHECK_VISIBILITY],[
AC_REQUIRE([AC_PROG_GREP])
# 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)]))
if test "$enable_visibility" = "no"; then
AC_MSG_CHECKING([enable symbol visibility])
AC_MSG_RESULT([no])
have_visibility=0
else
CFLAGS_orig="$CFLAGS"
CFLAGS="$CFLAGS_orig -fvisibility=hidden"
add=
AC_CACHE_CHECK([if $CC supports -fvisibility],
[ompi_cv_cc_fvisibility],
[AC_TRY_LINK([
#include <stdio.h>
__attribute__((visibility("default"))) int foo;
void bar(void) { fprintf(stderr, "bar\n"); };
],[],
[if test -s conftest.err ; then
$GREP -iq "visibility" conftest.err
if test "$?" = "0" ; then
ompi_cv_cc_fvisibility="no"
else
ompi_cv_cc_fvisibility="yes"
fi
else
ompi_cv_cc_fvisibility="yes"
fi],
[ompi_cv_cc_fvisibility="no"])
])
if test "$ompi_cv_cc_fvisibility" = "yes" ; then
add=" -fvisibility=hidden"
have_visibility=1
AC_MSG_CHECKING([enable symbol visibility])
AC_MSG_RESULT([yes])
AC_MSG_WARN([$add has been added to CFLAGS])
elif test "$enable_visibility" = "yes"; then
AC_MSG_ERROR([Symbol visibility support requested but compiler does not seem to support it. Aborting])
else
AC_MSG_CHECKING([enable symbol visibility])
AC_MSG_RESULT([no])
have_visibility=0
fi
CFLAGS="$CFLAGS_orig$add"
unset add
fi
AC_DEFINE_UNQUOTED([OMPI_C_HAVE_VISIBILITY], [$have_visibility],
[Whether C compiler supports -fvisibility])
])