Messages in this thread | | | Date | Mon, 3 Oct 2011 15:04:12 +0100 | From | Dave Martin <> | Subject | Re: [PATCH 05/11] ARM: vfp: use -mfloat-abi=soft to build vfp |
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On Sat, Oct 01, 2011 at 09:21:54PM +0200, Arnd Bergmann wrote: > Distros are starting to ship with toolchains defaulting to > hardfloat. Using such a compiler to build the kernel fails > in the VFP directory with > > arch/arm/vfp/entry.S:1:0: sorry, unimplemented: -mfloat-abi=hard and VFP > > Adding -mfloat-abi=soft to the gcc command line fixes this. > > Signed-off-by: Arnd Bergmann <arnd@arndb.de> > --- > arch/arm/vfp/Makefile | 2 +- > 1 files changed, 1 insertions(+), 1 deletions(-) > > diff --git a/arch/arm/vfp/Makefile b/arch/arm/vfp/Makefile > index 6de73aa..a81404c 100644 > --- a/arch/arm/vfp/Makefile > +++ b/arch/arm/vfp/Makefile > @@ -7,7 +7,7 @@ > # ccflags-y := -DDEBUG > # asflags-y := -DDEBUG > > -KBUILD_AFLAGS :=$(KBUILD_AFLAGS:-msoft-float=-Wa,-mfpu=softvfp+vfp) > +KBUILD_AFLAGS :=$(KBUILD_AFLAGS:-msoft-float=-Wa,-mfpu=softvfp+vfp -mfloat-abi=soft)
Although -mfpu=softvfp+vfp and -mfloat-abi=soft look mutually contradictory, this seems to have the correct effect, i.e. the assembler allows floating-point instructions but marks the resulting object as using the soft-float calling conventions.
The binutils documentation also seems to confirm that that's what should happen.
I don't see another combination of options for getting this effect.
So, if you like:
Reviewed-by: Dave Martin <dave.martin@linaro.org>
Cheers ---Dave
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