cmake PG should ensure correct libdir, otherwise ports are broken on linux

[Sergey Fedorov]

I just checked the CMake PG, and for Darwin it has a flag with the same
effect, but it is MacOS-specific. So yes, we do not need this for Darwin at
all, and I can make it specific to non-Apple.

On Tue, Sep 17, 2024 at 12:55 AM Christopher Jones via macports-dev <
macports-dev at lists.macports.org> wrote:

>
> Hi,
>
> I would say unless there is a need to also use this flag on darwin builds,
> and it would appear not, then as long as whatever you add to the PG it
> *only* activates for linux, and not darwin, then it cannot have any serious
> impact.
>
> Chris
>
> On 15 Sep 2024, at 1:59 PM, Sergey Fedorov <vital.had at gmail.com> wrote:
>
> Currently nothing in MacPorts sets libdir for CMake ports. On MacOS this
> is no issue. On Linux this leaves multiple ports broken, since CMake throws
> libs into ${prefix}/lib64, where nothing looks for them, so all dependents
> are broken.
> As a few examples: libdeflate, lerc, libjpeg-turbo.
>
> I think this should be fixed in cmake PG. Any objections to this?
>
> Original PR for libdeflate, should be changed to a general fix:
> https://github.com/macports/macports-ports/pull/25757
>
>
>
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