Re: Fix for configure error in 9.5/9.6 on macOS 11.0 Big Sur

On 2020-09-05 17:27, Tom Lane wrote:
> Jesse Zhang <sbjesse@gmail.com> writes:
>> Notice that -Werror=implicit-function-declaration up there? I spent a
>> few minutes digging in Apple's published fork of LLVM, they've been
>> forcing this error flag for quite a while, but this particular
>> warning-turned-error is guarded by a conditional along the lines of "is
>> this iOS-like" [1][2],
> 
> Wow, [1] is interesting:
> 
>      // For iOS and watchOS, also error about implicit function declarations,
>      // as that can impact calling conventions.
>      if (!isTargetMacOSBased())
>        CC1Args.push_back("-Werror=implicit-function-declaration");
> 
> I wonder if the new Xcode version dropped the not-macOS restriction
> on doing this?  It's not much of a stretch of the imagination
> to guess that the iOS/watchOS issue is related to Apple's ABI
> conventions for ARM, in which case they might have to do the
> same for macOS to get it to run on ARM ... which we can expect
> that Big Sur is ready for.
> 
> Anyway, I'm now satisfied that we understand where the problem really
> lies, so +1 for back-patching 1c0cf52b39ca3.

done

-- 
Peter Eisentraut              http://www.2ndQuadrant.com/
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