linux-kernel - [PATCH 1/5] Disallow building with gcc

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Date:	Mon, 13 Sep 2010 13:14:36 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Cc:	Florian Mickler <florian@...kler.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Russell King <linux@....linux.org.uk>,
	Mike Frysinger <vapier@...too.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: [PATCH 1/5] Disallow building with gcc < 3.4

Disallow building the generic kernel code with gcc < 3.4.  Earlier
versions of gcc have known problems, and it appears that anyone who
genuinely needs gcc 3.x can use gcc 3.4 at this point.

Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
 Documentation/Changes         |    2 +-
 include/linux/compiler-gcc3.h |   15 +--------------
 2 files changed, 2 insertions(+), 15 deletions(-)

diff --git a/Documentation/Changes b/Documentation/Changes
index 4fb88f1..0ea8040 100644
--- a/Documentation/Changes
+++ b/Documentation/Changes
@@ -28,7 +28,7 @@ necessary on all systems; obviously, if you don't have any ISDN
 hardware, for example, you probably needn't concern yourself with
 isdn4k-utils.
 
-o  Gnu C                  3.2                     # gcc --version
+o  Gnu C                  3.4                     # gcc --version
 o  Gnu make               3.80                    # make --version
 o  binutils               2.12                    # ld -v
 o  util-linux             2.10o                   # fdformat --version
diff --git a/include/linux/compiler-gcc3.h b/include/linux/compiler-gcc3.h
index b721129..c11d443 100644
--- a/include/linux/compiler-gcc3.h
+++ b/include/linux/compiler-gcc3.h
@@ -2,25 +2,12 @@
 #error "Please don't include <linux/compiler-gcc3.h> directly, include <linux/compiler.h> instead."
 #endif
 
-#if __GNUC_MINOR__ < 2
+#if __GNUC_MINOR__ < 4
 # error Sorry, your compiler is too old - please upgrade it.
 #endif
 
-#if __GNUC_MINOR__ >= 3
 # define __used			__attribute__((__used__))
-#else
-# define __used			__attribute__((__unused__))
-#endif
-
-#if __GNUC_MINOR__ >= 4
 #define __must_check		__attribute__((warn_unused_result))
-#endif
-
-#ifdef CONFIG_GCOV_KERNEL
-# if __GNUC_MINOR__ < 4
-#   error "GCOV profiling support for gcc versions below 3.4 not included"
-# endif /* __GNUC_MINOR__ */
-#endif /* CONFIG_GCOV_KERNEL */
 
 /*
  * A trick to suppress uninitialized variable warning without generating any
-- 
1.7.2.1

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