linux-kernel - [PATCH 3.8 18/81] compiler-gcc.h: Add gcc-recommended GCC

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Message-Id: <1383069882-11437-19-git-send-email-kamal@canonical.com>
Date:	Tue, 29 Oct 2013 11:03:39 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Daniel Santos <daniel.santos@...ox.com>,
	Andi Kleen <ak@...ux.intel.com>, Joe Perches <joe@...ches.com>,
	Josh Triplett <josh@...htriplett.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.8 18/81] compiler-gcc.h: Add gcc-recommended GCC_VERSION macro

3.8.13.12 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Daniel Santos <daniel.santos@...ox.com>

commit 3f3f8d2f48acfd8ed3b8e6b7377935da57b27b16 upstream.

Throughout compiler*.h, many version checks are made.  These can be
simplified by using the macro that gcc's documentation recommends.
However, my primary reason for adding this is that I need bug-check
macros that are enabled at certain gcc versions and it's cleaner to use
this macro than the tradition method:

  #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ => 2)

If you add patch level, it gets this ugly:

  #if __GNUC__ > 4 || (__GNUC__ == 4 && (__GNUC_MINOR__ > 2 || \
      __GNUC_MINOR__ == 2 __GNUC_PATCHLEVEL__ >= 1))

As opposed to:

  #if GCC_VERSION >= 40201

While having separate headers for gcc 3 & 4 eliminates some of this
verbosity, they can still be cleaned up by this.

See also:

  http://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html

Signed-off-by: Daniel Santos <daniel.santos@...ox.com>
Acked-by: Borislav Petkov <bp@...en8.de>
Acked-by: David Rientjes <rientjes@...gle.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Joe Perches <joe@...ches.com>
Cc: Josh Triplett <josh@...htriplett.org>
Cc: Paul Gortmaker <paul.gortmaker@...driver.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
[ kamal: 3.8-stable prereq for
  3f0116c "compiler/gcc4: Add quirk for 'asm goto' miscompilation bug" ]
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 include/linux/compiler-gcc.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index 6a6d7ae..24545cd 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -5,6 +5,9 @@
 /*
  * Common definitions for all gcc versions go here.
  */
+#define GCC_VERSION (__GNUC__ * 10000 \
+		   + __GNUC_MINOR__ * 100 \
+		   + __GNUC_PATCHLEVEL__)
 
 
 /* Optimization barrier */
-- 
1.8.1.2

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