[PATCH] Configure: add support for Homebrew on Apple Silicon

[Sergey Kandaurov]

> On 8 Mar 2024, at 19:31, Piotr Sikora via nginx-devel <nginx-devel at nginx.org> wrote:
> 
> Hi Sergey,
> 
>> An obvious question is why do you need this change.  Homebrew seems
>> to be quite niche to pay attention.
> 
> Homebrew [1] is orders of magnitude more popular than MacPorts [2],
> which is already supported by the configure script.

Thanks for clarifying this.

> 
>> Using appropriate paths in
>> --with-cc-opt / --with-ld-opt should work (not tested).
> 
> Everything under auto/lib can be replaced with --with-{cc,ld}-opt,
> so I don't really understand this reasoning.

Given the high popularity, it may be indeed not an option.

> 
>> A quick grep for MacPorts search paths suggests that some libraries
>> are missing in the change.  If this is on purpose, please reflect
>> this in the description.
> 
> libxml2, libxslt, and libexslt are all installed as part of Xcode,
> which is required to use Homebrew and compile anything on macOS.

This raises a question whether we need to test it for MacPorts as well,
which also requires SDK.  Obviously, it is out of scope of this patch.

> 
> I'll ship update patch in a moment.
> 
>> Apple Silicon is something from the marketing language,
>> using Apple ARM instead should be fine.
>> 
>> Notably, Homebrew uses Hardware::CPU.arm Ruby language boolean
>> to make the distinction.
> 
> There is no such thing as "Apple ARM".
> 
> The official documentation uses the term "Apple silicon" [3],
> Homebrew refers to the supported platform as "Apple Silicon" [4],
> and Wikipedia has an article about "Apple silicon" [5].

Thank you for clarification.

> 
>> Further, given the smooth decay on Intel-based hardware,
>> I'd reduce this just to "Homebrew".
> 
> But that would be misleading, seeing that the new code path doesn't do
> anything for Homebrew on Intel.
> 
> And then, there is Homebrew on Linux [6].

Given all the above argumentation, it makes sense
to push the patch just as is.

> 
> [1] https://formulae.brew.sh/analytics/install-on-request/30d/
> [2] https://ports.macports.org/statistics/ports/
> [3] https://support.apple.com/en-us/116943
> [4] https://formulae.brew.sh/formula/nginx#default
> [5] https://en.wikipedia.org/wiki/Apple_silicon
> [6] https://docs.brew.sh/Homebrew-on-Linux
> 
> Best regards,
> Piotr Sikora
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-- 
Sergey Kandaurov