Re: [FFmpeg-devel] Building for Mac x86 with GCC & NASM

["softworkz ." <softworkz-at-hotmail.com@ffmpeg.org>]

> -----Original Message-----
> From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of
> Martin Storsjö
> Sent: Mittwoch, 28. Mai 2025 10:40
> To: FFmpeg development discussions and patches <ffmpeg-
> devel@ffmpeg.org>
> Subject: Re: [FFmpeg-devel] Building for Mac x86 with GCC & NASM
> 
> On Wed, 28 May 2025, softworkz . wrote:
> 
> >> -----Original Message-----
> >> From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of
> >> Martin Storsjö
> >> Sent: Mittwoch, 28. Mai 2025 10:29
> >> To: FFmpeg development discussions and patches <ffmpeg-
> >> devel@ffmpeg.org>
> >> Subject: Re: [FFmpeg-devel] Building for Mac x86 with GCC & NASM
> >>
> >> On Wed, 28 May 2025, softworkz . wrote:
> >>
> >>>> -----Original Message-----
> >>>> From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of
> >>>> Christopher Snowhill
> >>>> Sent: Mittwoch, 28. Mai 2025 09:40
> >>>> To: FFmpeg development discussions and patches <ffmpeg-
> >>>> devel@ffmpeg.org>
> >>>> Subject: Re: [FFmpeg-devel] Building for Mac x86 with GCC & NASM
> >>>>
> >>>> On Tue May 27, 2025 at 10:54 PM PDT, Martin Storsjö wrote:
> >>>>> On Tue, 27 May 2025, softworkz . wrote:
> >>>>>
> >>>>>> Hi,
> >>>>>>
> >>>>>> I have an issue with the CI builds for Mac in a way that it
> >> prints
> >>>>>> tons of lines like this:
> >>>>>>
> >>>>>> ld: warning: no platform load command found in
> >>>> 'libavcodec/libavcodec.a[1008](sao_10bit.o)', assuming: macOS
> >>>>>> ld: warning: no platform load command found in
> >>>> 'libavcodec/libavcodec.a[1009](hpeldsp.o)', assuming: macOS
> >>>>>> ld: warning: no platform load command found in
> >>>> 'libavcodec/libavcodec.a[1011](huffyuvdsp.o)', assuming: macOS
> >>>>>> ld: warning: no platform load command found in
> >>>> 'libavcodec/libavcodec.a[1013](huffyuvencdsp.o)', assuming: macOS
> >>>>>>
> >>>>>>
> >>>>>> These are all about X86AM output. I've had those lines for all
> .o
> >>>> files
> >>>>>> before and was able to get rid of them by adding flags like
> >> below.
> >>>>>>
> >>>>>> Does anybody know how I can avoid those lines for the X86ASM
> >> output
> >>>> as well?
> >>>>>> (don't know much about building for Apple)
> >>>>>
> >>>>> These warnings appeared since the new linker in Xcode 15.0, 1.5
> >>>> years ago.
> >>>>> I'm not aware of a flag for silencing these warnings; the only
> way
> >>>> I'm
> >>>>> aware of is to force using the old linker by passing -Wl,-
> >>>> ld_classic.
> >>>>>
> >>>>> These warnings would go away of nasm could produce the right
> >>>> platform load
> >>>>> commands; this is https://github.com/netwide-
> >> assembler/nasm/pull/13,
> >>>> but
> >>>>> there hasn't been much progress on it. (And since the macOS
> >>>> ecossytem
> >>>>> mostly is moving away from x86, I guess there's progressively
> less
> >>>> effort
> >>>>> on it as well.)
> >>>>>
> >>>>> // Martin
> >>>>
> >>>> I do wonder how this is going, since I have never noticed such
> >>>> messages
> >>>> while building for x86 from an ARM machine. I continue to support
> >> x86
> >>>> machines all the way down to the minimum spec of current Xcode,
> >> which
> >>>> is
> >>>> 10.13.
> >>>
> >>> I don't think you can cross-compile x86 assembler on an arm
> machine.
> >>
> >> Why wouldn't you be able to do that? The assembler is an executable
> >> like
> >> any other, taking in source code and outputting object files. You
> can
> >> run
> >> that on any machine.
> >
> > I haven't seen any arm binary in nasm's MacOS package.
> > Is there a nasm package for arm? Then I'm wrong of course!
> 
> It's not very hard to compile it yourself. And macOS on arm can run
> x86_64
> binaries just fine

Of course - forgot about that 😊 

Thanks
sw
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