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[PATCH] x86: Detect CFI support in the assembler at runtime

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... 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: [email protected]
Cc: [email protected]

Signed-off-by: Andi Kleen <[email protected]>
This commit is contained in:
Andi Kleen 2006-09-26 10:52:30 +02:00 • committed by Andi Kleen
commit e2414910f2
5 changed files with 20 additions and 1 deletions
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5
Documentation/kbuild/makefiles.txt
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@ -421,6 +421,11 @@ more details, with real examples.
The second argument is optional, and if supplied will be used
if first argument is not supported.
as-instr
as-instr checks if the assembler reports a specific instruction
and then outputs either option1 or option2
C escapes are supported in the test instruction
cc-option
cc-option is used to check if $(CC) supports a given option, and not
supported to use an optional second option.