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authorDaniel Santos <daniel.santos@pobox.com>2013-02-21 16:41:39 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-21 17:22:15 -0800
commit3f3f8d2f48acfd8ed3b8e6b7377935da57b27b16 (patch)
treec0d64cae2c1d27d001df57e93b9bef1613073eb2
parent6640dfdf6fff387c0a8f7fb8ac1d47c6b093484e (diff)
compiler-gcc.h: Add gcc-recommended GCC_VERSION macro
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@pobox.com> Acked-by: Borislav Petkov <bp@alien8.de> Acked-by: David Rientjes <rientjes@google.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Joe Perches <joe@perches.com> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/compiler-gcc.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index 6a6d7aefe12d..24545cd90a25 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 */