linux-kernel - [PATCH] [28/35] x86: Drop cc-options call for all options supported in gcc 3.2+

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Date:	Sat, 28 Apr 2007 19:52:53 +0200 (CEST)
From:	Andi Kleen <ak@...e.de>
To:	linux-kernel@...r.kernel.org, patches@...-64.org
Subject: [PATCH] [28/35] x86: Drop cc-options call for all options supported in gcc 3.2+

The kernel only supports gcc 3.2+ now so it doesn't make sense
anymore to explicitely check for options this compiler version
already has.

This actually fixes a bug. The -mprefered-stack-boundary check
never worked because gcc rightly complains

  CC      arch/i386/kernel/asm-offsets.s
cc1: -mpreferred-stack-boundary=2 is not between 4 and 12

We just never saw the error because of cc-options.
I changed it to 4 to actually work.

Tested by compiling i386 and x86-64 defconfig with gcc 3.2.

Should speed up the build time a tiny bit and improve
stack usage on i386 slightly.

Signed-off-by: Andi Kleen <ak@...e.de>

---
 Makefile           |    2 +-
 arch/i386/Makefile |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

Index: linux/Makefile
===================================================================
--- linux.orig/Makefile
+++ linux/Makefile
@@ -491,7 +491,7 @@ endif
 include $(srctree)/arch/$(ARCH)/Makefile

 ifdef CONFIG_FRAME_POINTER
-CFLAGS		+= -fno-omit-frame-pointer $(call cc-option,-fno-optimize-sibling-calls,)
+CFLAGS		+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
 else
 CFLAGS		+= -fomit-frame-pointer
 endif
Index: linux/arch/i386/Makefile
===================================================================
--- linux.orig/arch/i386/Makefile
+++ linux/arch/i386/Makefile
@@ -34,7 +34,7 @@ CHECKFLAGS	+= -D__i386__
 CFLAGS += -pipe -msoft-float -mregparm=3 -freg-struct-return

 # prevent gcc from keeping the stack 16 byte aligned
-CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
+CFLAGS += -mpreferred-stack-boundary=4

 # CPU-specific tuning. Anything which can be shared with UML should go here.
 include $(srctree)/arch/i386/Makefile.cpu
-
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