[Pixman] [PATCH 1/2] autotools: use custom build rule to build iwMMXt code

Matt Turner mattst88 at gmail.com
Tue Jul 30 13:18:39 PDT 2013

On Tue, Jul 30, 2013 at 1:08 PM, Matt Turner <mattst88 at gmail.com> wrote:
> On Sat, Jul 27, 2013 at 10:35 AM, Siarhei Siamashka
> <siarhei.siamashka at gmail.com> wrote:
>> configure:13042: checking whether to use ARM IWMMXT intrinsics
>> configure:13068: gcc -c -g -O2 -Wall -fno-strict-aliasing -fvisibility=hidden -flax-vector-conversions -Winline -march=iwmmxt2  conftest.c >&5
>> conftest.c:1:0: sorry, unimplemented: iWMMXt and hardware floating point
> This error is because your gcc is too old. I can't remember exactly
> but I think >=4.7 is needed to build the iwMMXt code with hardfp.
>>=4.7 is certainly needed for working iwMMXt support at all.

Right, so, the bugs preventing iwMMXt code generation are fixed in gcc
4.7. gcc-4.8 contains better support, a new machine description for
Marvell CPUs, and support for iwMMXt + hardfp.

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