On 08/06/2012 04:36 AM, dragos.tatu...@intel.com wrote:
> From: Dragos Tatulea <dragos.tatu...@intel.com>
>
> If gcc has a different default fpmath set (e.g. sse),
> many unuseful warnings will be spewed when compiling on an
> architecture that doesn't support it.
>
> An example would be Google's Android 4.1 x86 toochain which
> is compiled with -mfpmath=sse.
>
> This can affect out of tree modules that compile with
> -Werror (ex: systemtap stp scripts).
>
> Signed-off-by: Dragos Tatulea <dragos.tatu...@intel.com>
> ---
> arch/x86/Makefile | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/x86/Makefile b/arch/x86/Makefile
> index b1c611e..f4fefb8 100644
> --- a/arch/x86/Makefile
> +++ b/arch/x86/Makefile
> @@ -130,6 +130,7 @@ KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
> # prevent gcc from generating any FP code by mistake
> KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
> KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
> +KBUILD_CFLAGS += $(call cc-option,-mfpmath=387,)
>
> KBUILD_CFLAGS += $(mflags-y)
> KBUILD_AFLAGS += $(mflags-y)
>
I guess we should do -msoft-float as well to try to get an error if FP
instructions are generated at all...
-hpa
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