get a compiler version?

[Sergey A. Osokin]

Hi Josh,

thanks for the reply.

On Sat, Oct 02, 2021 at 12:55:04PM +1000, Joshua Root wrote:
> On 2021-10-2 01:39 , Sergey A. Osokin wrote:
> > Hi,
> > 
> > could you guide me how to get a compiler's version.
> > 
> > I know it's possible to use configure.cc and configure.compiler
> > variables (their default values are /usr/bin/clang and clang),
> > but is there a variable with the clang version?
> 
> There's no variable because getting that information requires running 
> the compiler. That's also not something you want to be doing every time 
> your Portfile is parsed, if you can help it.
> 
> So let's take a step back and ask: what are you trying to do? If your 
> port needs a compiler with support for a particular language standard 
> for example, there are options you can set to request that.

I've found that www/unit builds, primarily unit-perl* and unit-ruby
modules, fail when it runs with clang13.  And that's because of the
-Wcompound-token-split-by-macro warning, enable by default for clang13.
Here's the similar issue and bug report,
https://bugs.ruby-lang.org/issues/17865

From the other side, all 12 builds are successful with clang12.

Please note, that's not an issue with NGINX Unit itself, that's the
issues when clang13 builds unit-perl* and unit-ruby* modules, and
there's no issue with unit-python* modules.

So, the forehead solution is probably disable -Werror warning for
perl and ruby modules with a reinplace, but I see no reason to do
that for all 12 ports, that's why I'm looking for details how to
enable -Wno-compound-token-split-by-macro for a specific compiler
version.

-- 
Sergey Osokin
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