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List:       ltp-list
Subject:    [LTP] [PATCH 1/2] configure: add configure check for GCC built-in function
From:       Alexey Kodanev <alexey.kodanev () oracle ! com>
Date:       2013-11-27 9:36:52
Message-ID: 1385545013-22647-1-git-send-email-alexey.kodanev () oracle ! com
[Download RAW message or body]

New m4 function tries to determine if GCC has __sync_fetch_and_or built-in
function which performs an atomic bit-wise inclusive OR operation.

Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.com>
---
 configure.ac          |    1 +
 m4/ltp-gcc_builtin.m4 |   43 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+), 0 deletions(-)
 create mode 100644 m4/ltp-gcc_builtin.m4

diff --git a/configure.ac b/configure.ac
index 4846afd..13ef749 100644
--- a/configure.ac
+++ b/configure.ac
@@ -170,5 +170,6 @@ LTP_CHECK_FS_IOC_FLAGS
 LTP_CHECK_MREMAP_FIXED
 LTP_CHECK_KERNEL_DEVEL
 LTP_CHECK_XFS_QUOTACTL
+LTP_CHECK_GCC_BUILTIN
 
 AC_OUTPUT
diff --git a/m4/ltp-gcc_builtin.m4 b/m4/ltp-gcc_builtin.m4
new file mode 100644
index 0000000..371fea7
--- /dev/null
+++ b/m4/ltp-gcc_builtin.m4
@@ -0,0 +1,43 @@
+dnl Copyright (c) 2013 Oracle and/or its affiliates. All Rights Reserved.
+dnl
+dnl This program is free software; you can redistribute it and/or
+dnl modify it under the terms of the GNU General Public License as
+dnl published by the Free Software Foundation; either version 2 of
+dnl the License, or (at your option) any later version.
+dnl
+dnl This program is distributed in the hope that it would be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+dnl GNU General Public License for more details.
+dnl
+dnl You should have received a copy of the GNU General Public License
+dnl along with this program; if not, write the Free Software Foundation,
+dnl Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+dnl
+dnl Author: Alexey Kodanev <alexey.kodanev@oracle.com>
+dnl
+
+dnl
+dnl LTP_CHECK_GCC_BUILTIN
+dnl ----------------------------
+dnl Checking for GCC atomic memory access built-in function __sync_fetch_and_or
+dnl which performs an atomic bit-wise inclusive OR operation
+dnl
+
+AC_DEFUN([LTP_CHECK_GCC_BUILTIN],[dnl
+
+AC_MSG_CHECKING([for __sync_fetch_and_or])
+
+AC_LINK_IFELSE(
+	[AC_LANG_PROGRAM([], [int i; return __sync_fetch_and_or(&i, 0);])],
+	[have_sync_fetch_and_or=yes],
+	[have_sync_fetch_and_or=no]
+)
+
+AS_IF([test "$have_sync_fetch_and_or" = yes],
+	AC_DEFINE([HAVE_SYNC_FETCH_AND_OR], [1],
+	          [Define if GCC has __sync_fetch_and_or]))
+
+AC_MSG_RESULT($have_sync_fetch_and_or)
+
+])
-- 
1.7.1


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