Re: [PATCH] gstreamer: gst-ffmpeg: fix build issues for libav

[Derek Buitenhuis <derek.buitenhuis@gmail.com>]

On 07/08/2012 11:24 AM, Yao Zhao wrote:
>>> 1.The included libav configure is not generated by autotools
>>>    patch use-correct-toolchain.patch patched its configure to
>>> use correct toolchain wrapper.
>> Why are you patching the toolchain instead of passing the correct parameters
>> to configure (--enable-cross-compile, --cross-prefix-..., etc)?
> in the configure,
> ar_default="${cross_prefix}${ar_default}"
> cc_default="${cross_prefix}${cc_default}"
> nm_default="${cross_prefix}${nm_default}"
> pkg_config_default="${cross_prefix}${pkg_config_default}"
> ranlib="${cross_prefix}${ranlib}"
> 
> cc_default is the gcc so cc_default will be for example: 
> powerpc-xxx-gcc, it won't use the toolcain wrapper.
> 
> I will try whether command line will solve these too.

Perhaps you are looking for --cc=<something>?

Same thing can be done with --ld, and pals if you desire.

Remember to set --arch, maybe --cpu and --target-os too, as well as --enable-cross-compile.

>>> 3.detect whether toolchain supports altivec, if not then add
>>> disable-altivec to libav's configure line or configure will fail
>> Wrong fix.
>>
>> http://git.libav.org/?p=libav.git;a=blob;f=configure;h=b139008d2b1aa5faea3f33c2a1922d0e1cb1fa5c;hb=HEAD#l2318
>>
>> It should be fixed by passing the proper CPU to libav's configure as an argument.
> 
>          e500v2)
>              cpuflags="-mcpu=8548 -mhard-float -mfloat-gprs=double"
>              disable altivec
>          ;;
>          e500)
>              cpuflags="-mcpu=8540 -mhard-float"
>              disable altivec
>          ;;
> 
> I am fixing for e500mc which is not a case here and I am not sure what 
> exactly the cpuflags should be.
> Any idea?

http://lists.libav.org/pipermail/libav-devel/2012-August/032990.html

Working on it.

- Derek