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| author | Daniel Santos <daniel.santos@pobox.com> | 2013-02-21 16:41:39 -0800 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2013-11-28 14:02:03 +0000 |
| commit | c12558716007837227b962caa4299b355870fed6 (patch) | |
| tree | 5be46b365050a7ae2e4f775fda7c5f9288099679 | |
| parent | ee698d67a4af1fd37ba5b40733f103a62f223774 (diff) | |
compiler-gcc.h: Add gcc-recommended GCC_VERSION macro
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@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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -rw-r--r-- | include/linux/compiler-gcc.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h index 3fd17c24922..5633053ac7c 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 */ |