linux-kernel - [PATCH 3.2 59/87] compiler-gcc.h: Add gcc-recommended GCC

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Message-ID: <lsq.1385387069.663579247@decadent.org.uk>
Date:	Mon, 25 Nov 2013 13:44:29 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Daniel Santos" <daniel.santos@...ox.com>,
	"Andi Kleen" <ak@...ux.intel.com>,
	"Borislav Petkov" <bp@...en8.de>, "Joe Perches" <joe@...ches.com>,
	"Paul Gortmaker" <paul.gortmaker@...driver.com>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"David Rientjes" <rientjes@...gle.com>,
	"Josh Triplett" <josh@...htriplett.org>
Subject: [PATCH 3.2 59/87] compiler-gcc.h: Add gcc-recommended GCC_VERSION
 macro

3.2.53-rc1 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>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 include/linux/compiler-gcc.h | 3 +++
 1 file changed, 3 insertions(+)

--- 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 */

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