Comments on: LLVM Recognition

By: JB

JB — Mon, 29 Jun 2009 15:14:59 +0000

ignore “doesn’t” in the last part. ;)

By: JB

JB — Mon, 29 Jun 2009 15:14:12 +0000

Why aren’t you building OS X versions with GCC 4.2.1 as included with Leopard also? I’m getting good results with 4.2.1.

However I’m trying to compile with LLVM-GCC under Snow Leopard and getting strange results.

My AVCodecContext doesn’t misses apx 80% of all options, like -vcodec is all gone and a lot more other important ones. Any ideas or should I just stop trying..

By: Jai

Jai — Mon, 01 Jun 2009 05:33:00 +0000

And hopefully the the end of this year’s GSoC Open64 will be able to build FFmpeg as well. That should be interesting.

By: mat

mat — Tue, 26 May 2009 07:18:04 +0000

Hi Mike,

use –arch=c : llvm as very borken asm inline support.

For other failure, may be update llvm.

A version of ffmpeg build with “–cc=’clang -ccc-host-triple i686-linux-gnu’ –enable-gpl –arch=c –disable-debug” an llvm (r72387) pass codectest on x86_32

By: Michael Kostylev

Michael Kostylev — Sat, 23 May 2009 09:53:02 +0000

I’d say this is a masterpiece of the deadly optimization:

–cc=clang –-disable-sse -–disable-optimizations –extra-cflags=’-O1′ -> 237/262
–cc=clang –disable-optimizations –extra-cflags=’-O1′ -> 237/262
–cc=clang –disable-optimizations –extra-cflags=’-O1 -fomit-frame-pointer’ -> 255/262

By: Multimedia Mike

Multimedia Mike — Fri, 22 May 2009 21:42:16 +0000

Nice legwork, Michael. Is it miscompiling ASM stuff all over the place? Or something else? And I wonder if this applies to assorted other configurations that are experiencing problems?

By: Michael Kostylev

Michael Kostylev — Fri, 22 May 2009 16:12:44 +0000

x32_86/Linux
–cc=clang -> 155/262
–cc=clang –disable-sse -> 209/262
–cc=clang –disable-mmx -> 209/262
–cc=clang –disable-mmx –disable-optimizations -> 262/262

By: astrange

astrange — Thu, 21 May 2009 07:38:16 +0000

Could you run gcc svn/PPC with -fno-strict-aliasing once and see how many tests are fixed? I think it should be most of them.

There should really be dsputil unit tests to make it easier to find this kind of thing.