Re: [PATCH 2/3] gnu: vlc: Add configure flags.

[ludo@gnu.org (Ludovic Courtès)]

Leo Famulari <leo@famulari.name> skribis:

> On Sat, Sep 10, 2016 at 11:07:29AM +0800, Alex Vong wrote:
>> From 066bee5d7795c6caf2376be4a38e2cf0b397ef98 Mon Sep 17 00:00:00 2001
>> From: Alex Vong <alexvong1995@gmail.com>
>> Date: Sat, 10 Sep 2016 00:32:03 +0800
>> Subject: [PATCH 2/3] gnu: vlc: Add configure flags.
>> 
>> * gnu/packages/video.scm (vlc)[arguments]: Add configure flags to enable
>>   most fast-math optimizations.
>> ---
>>  gnu/packages/video.scm | 3 +++
>>  1 file changed, 3 insertions(+)
>> 
>> diff --git a/gnu/packages/video.scm b/gnu/packages/video.scm
>> index 858e007..a041666 100644
>> --- a/gnu/packages/video.scm
>> +++ b/gnu/packages/video.scm
>> @@ -650,7 +650,10 @@ audio/video codec library.")
>>         `(;; Gross workaround for <https://trac.videolan.org/vlc/ticket/16907>.
>>           ;; In our case, this led to a test failure:
>>           ;;   test_libvlc_equalizer: libvlc/equalizer.c:122: test_equalizer: Assertion `isnan(libvlc_audio_equalizer_get_amp_at_index (equalizer, u_bands))' failed.
>> +         ;; FIXME: This bug is fixed upstream. For now, we enable:
>>           "ac_cv_c_fast_math=no"
>> +         "CFLAGS=-ffast-math -fno-finite-math-only"
>> +         "CXXFLAGS=-ffast-math -fno-finite-math-only"
>
> I don't know much about this subject. Can anyone say if we can expect
> this to work on all our supported architectures?

Dunno; Alex, could you tell more?  :-)  Also, didn’t you mean to remove
the ac_cv_c_fast_math=no line altogether?

Ludo’.