From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kinsella, Ray Date: Thu, 10 Sep 2015 19:54:18 +0000 Subject: [Buildroot] [PATCH v4 2/2] Patch to assembler to strip LOCK prefix. Message-ID: <1441914858.20486.9.camel@intel.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net The lock prefix is usually stripped by passing to the compiler -Wa,momit-lock-prefix=yes via EXTRA_CFLAGS. However I couldn't find a way to get buildroot to pass CFLAGS/EXTRA_CFLAGS around. I tried using BR2_TARGET_OPTIMIZATION, and creating a new processor type but the flag kept stripping it out. I found the most reliable way to achieve the behavior was to make stripping the LOCK prefix the assembler's default behavior, hence the patch Signed-off-by: Ray Kinsella --- .../galileo/patches/binutils/2.25/default-lock-prefix.patch | 11 +++++++++++ 1 file changed, 11 insertions(+) create mode 100644 board/intel/galileo/patches/binutils/2.25/default-lock-prefix.patch diff --git a/board/intel/galileo/patches/binutils/2.25/default-lock-prefix.patch b/board/intel/galileo/patches/binutils/2.25/default-lock-prefix.patch new file mode 100644 index 0000000..7814ae4 --- /dev/null +++ b/board/intel/galileo/patches/binutils/2.25/default-lock-prefix.patch @@ -0,0 +1,11 @@ +--- a/gas/config/tc-i386.orig 2015-07-24 15:54:51.359080778 +0100 ++++ b/gas/config/tc-i386.c 2015-07-24 15:54:59.692192247 +0100 +@@ -545,7 +545,7 @@ static int allow_index_reg = 0; + + /* 1 if the assembler should ignore LOCK prefix, even if it was + specified explicitly. */ +-static int omit_lock_prefix = 0; ++static int omit_lock_prefix = 1; + + static enum check_kind + { -- 2.1.0