From: Linus Torvalds Date: Fri, 18 May 2007 03:18:11 +0000 (-0700) Subject: Revert "[PATCH] x86: Drop cc-options call for all options supported in gcc 3.2+" X-Git-Tag: v2.6.22-rc2~12 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=b46522394dde7341a5253658096f354b65cbd90d;p=linux-2.6-omap-h63xx.git Revert "[PATCH] x86: Drop cc-options call for all options supported in gcc 3.2+" This reverts commit c8fdd247255a3a027cd9f66dcf93e6847d1d2f85. It turns out the kernel was correct, and the gcc complaint was a gcc bug. The preferred stack boundary is expressed not in bytes, but in the the log2() of the preferred boundary, so "-mpreferred-stack-boundary=2" is in fact exactly what we want, but a gcc that is compiled for x86-64 will consider it an error (because the 64-bit calling sequence says that the stack should be 16-byte aligned) even if we are then using "-m32" to generate 32-bit code. Noted-by: Mikulas Patocka Cc: Jan Hubicka Acked-by: Andi Kleen Signed-off-by: Linus Torvalds --- diff --git a/Makefile b/Makefile index e6990e2cdaf..948fa09442f 100644 --- a/Makefile +++ b/Makefile @@ -491,7 +491,7 @@ endif include $(srctree)/arch/$(ARCH)/Makefile ifdef CONFIG_FRAME_POINTER -CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls +CFLAGS += -fno-omit-frame-pointer $(call cc-option,-fno-optimize-sibling-calls,) else CFLAGS += -fomit-frame-pointer endif diff --git a/arch/i386/Makefile b/arch/i386/Makefile index 6dc5e5d90fe..bd28f9f9b4b 100644 --- a/arch/i386/Makefile +++ b/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 += -mpreferred-stack-boundary=4 +CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2) # CPU-specific tuning. Anything which can be shared with UML should go here. include $(srctree)/arch/i386/Makefile.cpu