0278b86456
being hidden in libopal. This seems to make applications which also use libltdl play nicer. This commit was SVN r21731.
111 строки
4.5 KiB
Bash
111 строки
4.5 KiB
Bash
# -*- shell-script -*-
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#
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# Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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# University Research and Technology
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# Corporation. All rights reserved.
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# Copyright (c) 2004-2005 The University of Tennessee and The University
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# of Tennessee Research Foundation. All rights
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# reserved.
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# Copyright (c) 2004-2007 High Performance Computing Center Stuttgart,
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# University of Stuttgart. All rights reserved.
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# Copyright (c) 2004-2005 The Regents of the University of California.
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# All rights reserved.
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# Copyright (c) 2006-2007 Cisco Systems, Inc. All rights reserved.
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# Copyright (c) 2009 Sun Microsystems, Inc. All rights reserved.
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# $COPYRIGHT$
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#
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# Additional copyrights may follow
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#
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# $HEADER$
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#
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# OMPI_CHECK_VISIBILITY
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# --------------------------------------------------------
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AC_DEFUN([OMPI_CHECK_VISIBILITY],[
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AC_REQUIRE([AC_PROG_GREP])
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# Check if the compiler has support for visibility, like some versions of gcc, icc Sun Studio cc.
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AC_ARG_ENABLE(visibility,
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AC_HELP_STRING([--enable-visibility],
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[enable visibility feature of certain compilers/linkers (default: enabled)]))
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if test "$enable_visibility" = "no" -o "$opal_cv___attribute__visibility" = "0"; then
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AC_MSG_CHECKING([enable symbol visibility])
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AC_MSG_RESULT([no])
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have_visibility=0
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else
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CFLAGS_orig="$CFLAGS"
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add=
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# check using gcc -fvisibility=hidden flag
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CFLAGS="$CFLAGS_orig -fvisibility=hidden"
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AC_CACHE_CHECK([if $CC supports -fvisibility],
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[ompi_cv_cc_fvisibility],
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[AC_TRY_LINK([
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#include <stdio.h>
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__attribute__((visibility("default"))) int foo;
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void bar(void) { fprintf(stderr, "bar\n"); }
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],[],
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[if test -s conftest.err ; then
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$GREP -iq "visibility" conftest.err
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if test "$?" = "0" ; then
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ompi_cv_cc_fvisibility="no"
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else
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ompi_cv_cc_fvisibility="yes"
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fi
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else
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ompi_cv_cc_fvisibility="yes"
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fi],
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[ompi_cv_cc_fvisibility="no"])
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])
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if test "$ompi_c_vendor" = "sun" ; then
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# Check using Sun Studio -xldscope=hidden flag
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CFLAGS="$CFLAGS_orig -xldscope=hidden"
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AC_CACHE_CHECK([if $CC supports -xldscope],
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[ompi_cv_cc_xldscope],
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[AC_TRY_LINK([
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#include <stdio.h>
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__attribute__((visibility("default"))) int foo;
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void bar(void) { fprintf(stderr, "bar\n"); }
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],[],
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[if test -s conftest.err ; then
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$GREP -iq "visibility" conftest.err
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if test "$?" = "0" ; then
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ompi_cv_cc_xldscope="no"
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else
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ompi_cv_cc_xldscope="yes"
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fi
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else
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ompi_cv_cc_xldscope="yes"
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fi],
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[ompi_cv_cc_xldscope="no"])
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])
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fi
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if test "$ompi_cv_cc_fvisibility" = "yes" ; then
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add=" -fvisibility=hidden"
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have_visibility=1
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AC_MSG_CHECKING([enable symbol visibility])
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AC_MSG_RESULT([yes])
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AC_MSG_WARN([$add has been added to CFLAGS])
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elif test "$ompi_cv_cc_xldscope" = "yes" ; then
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add=" -xldscope=hidden"
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have_visibility=1
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AC_MSG_CHECKING([enable symbol visibility])
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AC_MSG_RESULT([yes])
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AC_MSG_WARN([$add has been added to CFLAGS])
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elif test "$enable_visibility" = "yes"; then
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AC_MSG_ERROR([Symbol visibility support requested but compiler does not seem to support it. Aborting])
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else
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AC_MSG_CHECKING([enable symbol visibility])
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AC_MSG_RESULT([no])
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have_visibility=0
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fi
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CFLAGS="$CFLAGS_orig$add"
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OPAL_VISIBILITY_CFLAGS="$add"
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unset add
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fi
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AC_DEFINE_UNQUOTED([OPAL_C_HAVE_VISIBILITY], [$have_visibility],
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[Whether C compiler supports -fvisibility])
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])
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