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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) 2006-2012 Cisco Systems, Inc. All rights reserved.
# Copyright (c) 2009-2011 Oracle and/or its affiliates. All rights reserved.
# $COPYRIGHT$
#
# Additional copyrights may follow
#
# $HEADER$
#
# OPAL_CHECK_VISIBILITY
# --------------------------------------------------------
AC_DEFUN([OPAL_CHECK_VISIBILITY],[
AC_REQUIRE([AC_PROG_GREP])
# Check if the compiler has support for visibility, like some
# versions of gcc, icc Sun Studio cc.
AC_ARG_ENABLE([visibility],
[AS_HELP_STRING([--enable-visibility],
[enable visibility feature of certain compilers/linkers (default: enabled)])])
opal_visibility_define=0
opal_msg="whether to enable symbol visibility"
if test "$enable_visibility" = "no"; then
AC_MSG_CHECKING([$opal_msg])
AC_MSG_RESULT([no (disabled)])
else
CFLAGS_orig=$CFLAGS
opal_add=
case "$opal_c_vendor" in
sun)
# Check using Sun Studio -xldscope=hidden flag
opal_add=-xldscope=hidden
CFLAGS="$OPAL_CFLAGS_BEFORE_PICKY $opal_add -errwarn=%all"
;;
*)
# Check using -fvisibility=hidden
opal_add=-fvisibility=hidden
CFLAGS="$OPAL_CFLAGS_BEFORE_PICKY $opal_add -Werror"
;;
esac
AC_MSG_CHECKING([if $CC supports $opal_add])
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <stdio.h>
__attribute__((visibility("default"))) int foo;
]],[[fprintf(stderr, "Hello, world\n");]])],
[AS_IF([test -s conftest.err],
[$GREP -iq visibility conftest.err
# If we find "visibility" in the stderr, then
# assume it doesn't work
AS_IF([test "$?" = "0"], [opal_add=])])
], [opal_add=])
AS_IF([test "$opal_add" = ""],
[AC_MSG_RESULT([no])],
[AC_MSG_RESULT([yes])])
CFLAGS=$CFLAGS_orig
OPAL_VISIBILITY_CFLAGS=$opal_add
if test "$opal_add" != "" ; then
opal_visibility_define=1
AC_MSG_CHECKING([$opal_msg])
AC_MSG_RESULT([yes (via $opal_add)])
elif test "$enable_visibility" = "yes"; then
AC_MSG_ERROR([Symbol visibility support requested but compiler does not seem to support it. Aborting])
else
AC_MSG_CHECKING([$opal_msg])
AC_MSG_RESULT([no (unsupported)])
fi
unset opal_add
fi
AC_DEFINE_UNQUOTED([OPAL_C_HAVE_VISIBILITY], [$opal_visibility_define],
[Whether C compiler supports symbol visibility or not])
])
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