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 10:29
> 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!

Thanks
sw



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