linux-kernel - [PATCH] x86: fix build with older gcc

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Date:   Mon, 24 Oct 2016 09:00:12 -0600
From:   "Jan Beulich" <JBeulich@...e.com>
To:     <mingo@...e.hu>, <tglx@...utronix.de>, <hpa@...or.com>
Cc:     <linux-kernel@...r.kernel.org>, <Valdis.Kletnieks@...edu>
Subject: [PATCH] x86: fix build with older gcc

Older gcc (observed with 4.1.x) doesn't support -Wno-override-init and
also doesn't ignore unknown -Wno-* options.

Fixes: 5e44258d16 "x86/build: Reduce the W=1 warnings noise when compiling x86 syscall tables"
Signed-off-by: Jan Beulich <jbeulich@...e.com>
Cc: Valdis Kletnieks <valdis.kletnieks@...edu> 
---
 arch/x86/entry/Makefile |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- 4.9-rc2/arch/x86/entry/Makefile
+++ 4.9-rc2-x86-entry-build/arch/x86/entry/Makefile
@@ -5,8 +5,8 @@
 OBJECT_FILES_NON_STANDARD_entry_$(BITS).o   := y
 OBJECT_FILES_NON_STANDARD_entry_64_compat.o := y
 
-CFLAGS_syscall_64.o		+= -Wno-override-init
-CFLAGS_syscall_32.o		+= -Wno-override-init
+CFLAGS_syscall_64.o		+= $(call cc-option,-Wno-override-init,)
+CFLAGS_syscall_32.o		+= $(call cc-option,-Wno-override-init,)
 obj-y				:= entry_$(BITS).o thunk_$(BITS).o syscall_$(BITS).o
 obj-y				+= common.o