From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: Wed, 3 Aug 2016 15:33:32 +0000 (+0200)
Subject: fs/proc: Add compiler check for -Wno-override-init to support gcc < 4.2
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=4b2e0162e4ab1a976eec0a36ca0bd920b02bfff3;p=openwrt%2Fstaging%2Fblogic.git

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: ca52953f5f24 ("fs/proc/task_mmu.c: suppress compilation warnings with W=1")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/fs/proc/Makefile b/fs/proc/Makefile
index a8c13605b434..12c6922c913c 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