Commit c47efe55 authored Sep 18, 2009 by Jory A. Pratt Committed by Sam Ravnborg Sep 20, 2009

kbuild: fix cc1 options check to ensure we do not use -fPIC when compiling



The arch/*/boot/Makefile use cc-options to check for GCC command options
and cc-options use the hardened specs when checking for GCC command
options.  When -fPIE is pass to cc1 it can't use -ffreestanding or
-fno-toplevel-reorder.  Then it fail to build stuff with -ffreestanding
and -fno-toplevel-reorder.

Thanks to Fredric Johansson for finding the main problem behind a failed
build using a hardened toolchain.

Signed-off-by: Magnus Granberg <zorry@ume.nu>
Signed-off-by: Jory A. Pratt <anarchy@gentoo.org>
Cc: Fredric Johansson <johansson_fredric@hotmail.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: <stable@kernel.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

parent 92f3f19c

scripts/Kbuild.include

+2 −2

Original line number	Diff line number	Diff line
		@@ -106,12 +106,12 @@ as-instr = $(call try-run,\
		# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)

		cc-option = $(call try-run,\
		$(CC) $(KBUILD_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",$(1),$(2))
		$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",$(1),$(2))

		# cc-option-yn
		# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
		cc-option-yn = $(call try-run,\
		$(CC) $(KBUILD_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",y,n)
		$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",y,n)

		# cc-option-align
		# Prefix align with either -falign or -malign

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