[PATCH] fs/proc: Add compiler check for -Wno-override-init to support gcc < 4.2

[Geert Uytterhoeven]

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 <ge...@linux-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