From e2414910f212c52d9d7c64c99a22863488ac5b48 Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Tue, 26 Sep 2006 10:52:30 +0200 Subject: [PATCH] x86: Detect CFI support in the assembler at runtime ... instead of using a CONFIG option. The config option still controls if the resulting executable actually has unwind information. This is useful to prevent compilation errors when users select CONFIG_STACK_UNWIND on old binutils and also allows to use CFI in the future for non kernel debugging applications. Cc: jbeulich@novell.com Cc: sam@ravnborg.org Signed-off-by: Andi Kleen --- scripts/Kbuild.include | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'scripts/Kbuild.include') diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include index 3d523899fdc0..7adef12a0c26 100644 --- a/scripts/Kbuild.include +++ b/scripts/Kbuild.include @@ -63,6 +63,13 @@ as-option = $(shell if $(CC) $(CFLAGS) $(1) -Wa,-Z -c -o /dev/null \ -xassembler /dev/null > /dev/null 2>&1; then echo "$(1)"; \ else echo "$(2)"; fi ;) +# as-instr +# Usage: cflags-y += $(call as-instr, instr, option1, option2) + +as-instr = $(shell if echo -e "$(1)" | $(AS) -Z -o astest$$$$.out \ + 2>&1 >/dev/null ; then echo "$(2)"; else echo "$(3)"; fi; \ + rm -f astest$$$$.out) + # cc-option # Usage: cflags-y += $(call cc-option, -march=winchip-c6, -march=i586) -- cgit v1.2.3