Re: [gentoo-user] [SOLVED] ffmpeg - fails to compile on amd64

[Joseph <syscon780@gmail.com>]

On 12/12/11 21:52, Michael Schreckenbauer wrote:
>Am Montag, 12. Dezember 2011, 13:28:39 schrieb Joseph:
>> On 12/12/11 20:32, Michael Hampicke wrote:
>> >> Configuring source in
>> >> /var/tmp/portage/media-video/ffmpeg-0.7.8/work/ffmpeg-0.7.8 ...
>> >> x86_64-pc-linux-gnu-gcc is unable to create an executable file.
>> >> If x86_64-pc-linux-gnu-gcc is a cross-compiler, use the
>> >> --enable-cross-compile option.
>> >> Only do this if you know what cross compiling means.
>> >> C compiler test failed.
>> >
>> >Do you have enabled the "cpudetection" and/or "custom-cflags" use flags?
>> >Or do you use some crazy CFLAGS?
>> >ffmpeg 0.7.8 compiles just fine on my amd64 box.
>>
>> No nothing crazy:
>> CFLAGS="-Os -pipe -mtune=i686"
>
>i686? That's not amd64. You need something 64bit. Just use march=native
>instead of mtune=i686.
>
>
>> I'm not even sure if these flags are correct for my CPU:
>> AMD FX(tm)-8150 Eight-Core Processor

Thanks, you are correct. 
The Cflags that were suggested by Gentoo wiki did not work at all so I wasn't sure what to enter and took them from Gen too Rescue CD that I bootstrap the 
system.
But after changing the flags to:
CFLAGS="-march=native -Os -pipe" 

ffmpeg compiled just fine.

-- 
Joseph