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From: raj.khem@gmail.com (Khem Raj)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 05/11] ARM: vfp: use -mfloat-abi=soft to build vfp
Date: Tue, 04 Oct 2011 19:04:09 -0700	[thread overview]
Message-ID: <4E8BBB19.8080303@gmail.com> (raw)
In-Reply-To: <20111003140411.GB2117@arm.com>

On 10/3/2011 7:04 AM, Dave Martin wrote:
> 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.

I was wondering if this could also be achieved with -mfloat-abi=softfp 
this will also add Tag_FP_arch: VFPv2 into .attributes section and 
-Wa,-mfpu=softvfp+vfp may not be needed.

>
> 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
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2011-10-05  2:04 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-10-01 19:21 [PATCH 00/11] Generic ARM fixes for randconfig Arnd Bergmann
2011-10-01 19:21 ` Arnd Bergmann
2011-10-01 19:21 ` [PATCH 01/11] ARM: export rtc_lock for nvram driver Arnd Bergmann
2011-10-01 19:21   ` Arnd Bergmann
2011-10-02 15:21   ` Russell King - ARM Linux
2011-10-02 15:21     ` Russell King - ARM Linux
2011-10-01 19:21 ` [PATCH 02/11] ARM: SMP depends on MMU Arnd Bergmann
2011-10-01 19:21   ` Arnd Bergmann
2011-10-01 19:21 ` [PATCH 03/11] ARM: always use ARM_UNWIND for thumb2 kernels Arnd Bergmann
2011-10-01 19:21   ` Arnd Bergmann
2011-10-01 19:21 ` [PATCH 04/11] ARM: allow building alignment.c without PROC_FS Arnd Bergmann
2011-10-01 19:21   ` Arnd Bergmann
2011-10-01 19:21 ` [PATCH 05/11] ARM: vfp: use -mfloat-abi=soft to build vfp Arnd Bergmann
2011-10-01 19:21   ` Arnd Bergmann
2011-10-03 14:04   ` Dave Martin
2011-10-03 14:04     ` Dave Martin
2011-10-05  2:04     ` Khem Raj [this message]
2011-10-01 19:21 ` [PATCH 06/11] ARM: pm: let platforms select cpu_suspend support Arnd Bergmann
2011-10-01 19:21   ` Arnd Bergmann
2011-10-01 19:21 ` [PATCH 07/11] ARM: limit CONFIG_HAVE_IDE to platforms that do Arnd Bergmann
2011-10-01 19:21   ` Arnd Bergmann
2011-10-01 19:21 ` [PATCH 08/11] ARM: add io{read,write}{16,32}be functions Arnd Bergmann
2011-10-01 19:21   ` Arnd Bergmann
2011-10-01 19:21 ` [PATCH 09/11] ARM: pci: always export pcibios_bus_to_resource Arnd Bergmann
2011-10-01 19:21   ` Arnd Bergmann
2011-10-01 19:21 ` [PATCH 10/11] ARM: OC_ETM should not select ARM_AMBA Arnd Bergmann
2011-10-01 19:21   ` Arnd Bergmann
2011-10-01 19:22 ` [PATCH 11/11] ARM: common/vic: use proper __iomem annotations Arnd Bergmann
2011-10-01 19:22   ` Arnd Bergmann
2011-10-05  1:24   ` H Hartley Sweeten
2011-10-05  1:24     ` H Hartley Sweeten
2011-10-02 13:46 ` [PATCH 12/11] ARM: include linux/highmem.h in uaccess functions Arnd Bergmann
2011-10-02 13:46   ` Arnd Bergmann
2011-10-02 15:36 ` [PATCH 00/11] Generic ARM fixes for randconfig Russell King - ARM Linux
2011-10-02 15:36   ` Russell King - ARM Linux
2011-10-02 15:42   ` Arnd Bergmann
2011-10-02 15:42     ` Arnd Bergmann
2011-10-02 15:47     ` Russell King - ARM Linux
2011-10-02 15:47       ` Russell King - ARM Linux

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