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

[Christopher Snowhill]

On Wed May 28, 2025 at 1:12 AM PDT, softworkz . wrote:
>
>
>> -----Original Message-----
>> From: ffmpeg-devel <ffmpeg-devel-bounces at ffmpeg.org> On Behalf Of
>> Christopher Snowhill
>> Sent: Mittwoch, 28. Mai 2025 09:40
>> To: FFmpeg development discussions and patches <ffmpeg-
>> devel at 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.

Oh, but you can! And thanks to Rosetta 2, I can even test it! But that's
another rugpull waiting to happen soon enough.

>
> Best regards
> sw
>
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