linux-kernel - [PATCH] fs/proc: Add compiler check for -Wno-override-init to support gcc

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Message-Id: <1470238412-20299-1-git-send-email-geert@linux-m68k.org>
Date:	Wed,  3 Aug 2016 17:33:32 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Valdis Kletnieks <Valdis.Kletnieks@...edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH] fs/proc: Add compiler check for -Wno-override-init to support gcc < 4.2

With gcc < 4.2 (e.g. 4.1.2):

      CC      fs/proc/task_mmu.o
    cc1: error: unrecognized command line option "-Wno-override-init"

To fix this, only enable the compiler option when it is actually
supported by the compiler.

Fixes: ca52953f5f24aff0 ("fs/proc/task_mmu.c: suppress compilation warnings with W=1")
Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
---
 fs/proc/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/proc/Makefile b/fs/proc/Makefile
index a8c13605b43482a7..12c6922c913c4519 100644
--- a/fs/proc/Makefile
+++ b/fs/proc/Makefile
@@ -4,7 +4,7 @@
 
 obj-y   += proc.o
 
-CFLAGS_task_mmu.o	+= -Wno-override-init
+CFLAGS_task_mmu.o	+= $(call cc-option,-Wno-override-init,)
 proc-y			:= nommu.o task_nommu.o
 proc-$(CONFIG_MMU)	:= task_mmu.o
 
-- 
1.9.1