[PATCH 3.14 83/83] x86-64, build: Fix stack protector Makefile breakage with 32-bit userland

Greg Kroah-Hartman
2014-05-11T19:26:15Z

From: George Spelvin <linux@horizon.com>

commit 14262d67fe348018af368a07430fbc06eadeabb1 upstream.

If you are using a 64-bit kernel with 32-bit userland, then
scripts/gcc-x86_64-has-stack-protector.sh invokes 32-bit gcc
with -mcmodel=kernel, which produces:

<stdin>:1:0: error: code model 'kernel' not supported in the 32 bit mode

and trips the "broken compiler" test at arch/x86/Makefile:120.

There are several places a fix is possible, but the following seems
cleanest. (But it's minimal; it would also be possible to factor
out a bunch of stuff from the two branches of the if.)

Signed-off-by: George Spelvin <linux@horizon.com>
Link: http://lkml.kernel.org/r/20140507210552.7581.qmail@ns.horizon.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/x86/Makefile | 1 +
1 file changed, 1 insertion(+)

--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -79,6 +79,7 @@ else
UTS_MACHINE := x86_64
CHECKFLAGS += -D__x86_64__ -m64

+ biarch := -m64
KBUILD_AFLAGS += -m64
KBUILD_CFLAGS += -m64