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authorAndi Kleen <ak@suse.de>2006-09-26 04:52:30 -0400
committerAndi Kleen <andi@basil.nowhere.org>2006-09-26 04:52:30 -0400
commite2414910f212c52d9d7c64c99a22863488ac5b48 (patch)
tree5a7e55191ace4aa755c0684bcefc9cf1b124128c /arch/x86_64/Makefile
parentfe7414a2882c953788af13a7f2c9d570ed8f71c5 (diff)
[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 <ak@suse.de>
Diffstat (limited to 'arch/x86_64/Makefile')
-rw-r--r--arch/x86_64/Makefile3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86_64/Makefile b/arch/x86_64/Makefile
index 431bb4bc36cd..d6472ddf5f6e 100644
--- a/arch/x86_64/Makefile
+++ b/arch/x86_64/Makefile
@@ -54,6 +54,9 @@ endif
54cflags-y += $(call cc-option,-funit-at-a-time) 54cflags-y += $(call cc-option,-funit-at-a-time)
55# prevent gcc from generating any FP code by mistake 55# prevent gcc from generating any FP code by mistake
56cflags-y += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,) 56cflags-y += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
57# do binutils support CFI?
58cflags-y += $(call as-instr,.cfi_startproc\n.cfi_endproc,-DCONFIG_AS_CFI=1,)
59AFLAGS += $(call as-instr,.cfi_startproc\n.cfi_endproc,-DCONFIG_AS_CFI=1,)
57 60
58CFLAGS += $(cflags-y) 61CFLAGS += $(cflags-y)
59CFLAGS_KERNEL += $(cflags-kernel-y) 62CFLAGS_KERNEL += $(cflags-kernel-y)