On Wed, Aug 22, 2018 at 06:11:15PM +0800, Shiyou Yin wrote: > >-----Original Message----- > >From: ffmpeg-devel-boun...@ffmpeg.org > >[mailto:ffmpeg-devel-boun...@ffmpeg.org] On Behalf Of > >Michael Niedermayer > >Sent: Wednesday, August 22, 2018 6:04 AM > >To: FFmpeg development discussions and patches > >Subject: Re: [FFmpeg-devel] [PATCH 1/9] configure: [loongson] revert > >no-expensive-optimizations > > > >On Tue, Aug 21, 2018 at 04:06:05PM +0800, Shiyou Yin wrote: > >> >-----Original Message----- > >> >From: ffmpeg-devel-boun...@ffmpeg.org > >> >[mailto:ffmpeg-devel-boun...@ffmpeg.org] On Behalf Of Shiyou Yin > >> >Sent: Thursday, July 12, 2018 8:44 PM > >> >To: ffmpeg-devel@ffmpeg.org > >> >Subject: [FFmpeg-devel] [PATCH 1/9] configure: [loongson] revert > >> >no-expensive-optimizations > >> > > >> >The bug in gcc-4.9.x has been fixed in gcc master branch. > >> >Loongson released gcc-4.9.3-3.fc21.loongson with this patch. > >> >More bug info see: > >> >https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67736 > >> >https://gcc.gnu.org/ml/gcc-patches/2012-05/msg00401.html > >> > > >> >Change-Id: I780125d4cdee71d40457aaee22126ba0547a2c8f > >> >Signed-off-by: Shiyou Yin <yinshiyou...@loongson.cn> > >> >--- > >> > configure | 6 +++--- > >> > 1 file changed, 3 insertions(+), 3 deletions(-) > >> > > >> >diff --git a/configure b/configure > >> >index b1a4dcf..17a7ea9 100755 > >> >--- a/configure > >> >+++ b/configure > >> >@@ -4789,13 +4789,13 @@ elif enabled mips; then > >> > disable mipsdspr2 > >> > case $cpu in > >> > loongson3*) > >> >- cpuflags="-march=loongson3a -mhard-float > >-fno-expensive-optimizations" > >> >+ cpuflags="-march=loongson3a -mhard-float" > >> > ;; > >> > loongson2e) > >> >- cpuflags="-march=loongson2e -mhard-float > >-fno-expensive-optimizations" > >> >+ cpuflags="-march=loongson2e -mhard-float" > >> > ;; > >> > loongson2f) > >> >- cpuflags="-march=loongson2f -mhard-float > >-fno-expensive-optimizations" > >> >+ cpuflags="-march=loongson2f -mhard-float" > >> > ;; > >> > esac > >> > ;; > >> >-- > >> >2.1.0 > >> > > >> > >> Hi Michael, could you please help to apply this patch. It has been tested > >> on loongson platform. > > > >shouldnt this test the compiler the user uses ? its version or something ? > > > Thank you very much for your review. Be strictly, it's needed to check the > compiler version which > user uses. > Consider that this bug has been fixed about three years and the compiler has > been upgraded a lot of > times in loongson yum repository. > At present, there are still only a few developers will build ffmpeg on > loongson platform. The risk > of his change is controllable. > So, between the simplicity and absolute reliability of the code I chosed the > simplicity this time. > Should I still add version check here?
I think there should maybe be a check for the minimum gcc version supported then to ensure that no too old version is used. If you do not want to add teh flag for specific versions The effect of the bug was IIRC not trivial to connect to the gcc version so it could leave a developer quite lost and confused what is causing it [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB I am the wisest man alive, for I know one thing, and that is that I know nothing. -- Socrates
signature.asc
Description: PGP signature
_______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
