[FFmpeg-devel] commits ecee6af8bd and 4ac869ca2a break build for macOS

[Christopher Degawa]

On Mon, Dec 20, 2021 at 7:21 PM Aman Karmani <ffmpeg at tmm1.net> wrote:

>
>
> On Mon, Dec 20, 2021 at 5:03 PM Helmut K. C. Tessarek <
> tessarek at evermeet.cx> wrote:
>
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA512
>>
>> On 2021-12-20 19:11, Christopher Degawa wrote:
>> > So I've exported "LIBRARY_PATH" to
>>
>> I'm sorry to say, this is a workaround but hardly a solution.
>>
>
> No one said this is the solution. We are just trying to figure out what is
> going on, and this added information is very helpful in that effort.
>
>
>> Before these 2 commits all worked perfectly. Now it doesn't. Tweaking the
>> build env is not a solution.
>> Next time someone commits something, are we supposed to tweak it again?
>> Where does it end?
>>
>
> I'm not sure what your point is. If you are having trouble with those
> commits, then you can use an older version?
>
> Or you can compile with `./configure --disable-metal` to disable the new
> feature.
>
> Obviously the code worked on both my and Ridley's computers. If it didn't
> work, we wouldn't have committed it.
>
> Once we figure out why some computers are using the wrong metal binary,
> then we can fix it and commit the fix to master as well.
>


Digging a bit into xcrun itself, looking at
https://real-world-systems.com/docs/xcrun.1.html, it says

> The SDK which will be searched defaults to the most recent available SDK

and

xcodebuild -version -sdk | head
iPhoneOS14.3.sdk - iOS 14.3 (iphoneos14.3)
SDKVersion: 14.3
Path:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS14.3.sdk
PlatformVersion: 14.3

Which I'm guessing might be the reason, but still doesn't really make
logical sense and running

xcrun --verbose metal -v
...
xcrun: note: SDKROOT = '/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk'
...
xcrun: note: lookup resolved in
'/var/folders/yf/4yc0fdvx7zv1t17w41kxmr0r0000gn/T/xcrun_db' :
'/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/metal'
Apple LLVM version 31001.43 (metalfe-31001.43)
Target: air64-apple-darwin19.6.0
Thread model: posix
InstalledDir:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/metal/ios/bin

which also, doesn't make sense.

exporting SDKROOT to `macosx` does make it show

xcrun: note: SDKROOT =
'/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.1.sdk'

xcrun: note: lookup resolved in
'/var/folders/yf/4yc0fdvx7zv1t17w41kxmr0r0000gn/T/xcrun_db' :
'/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/metal'
Apple LLVM version 31001.143 (metalfe-31001.143)
Target: air64-apple-darwin19.6.0
Thread model: posix
InstalledDir:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/metal/macos/bin

so, I'm not sure what conclusion to bring from this.


>
>>
>>
>> - --
>> regards Helmut K. C. Tessarek              KeyID 0x172380A011EF4944
>> Key fingerprint = 8A55 70C1 BD85 D34E ADBC 386C 1723 80A0 11EF 4944
>>
>> /*
>>    Thou shalt not follow the NULL pointer for chaos and madness
>>    await thee at its end.
>> */
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>