Mk/bsd.options.mk: Add opt_MESON_ENABLE options helper

[tobik]

Summary

Some newer ports using Meson now pass -Dopt=enabled or -Dopt=disabled
to it. Maybe we should add an options helper for this now.

I converted x11/swaylock as an example.

This is for Meson's new feature build options which are available since 0.47.0.

https://mesonbuild.com/Release-notes-for-0-47-0.html#new-type-of-build-option-for-features
https://mesonbuild.com/Build-options.html#features

[mat]

Using the *_MESON_TRUE is not possible ?

Also, you probably will need a *_MESON_DISABLE. (doing what the _FALSE does for the _TRUE.)

[tobik]

In D19085#408107, @mat wrote:

Using the *_MESON_TRUE is not possible ?

No. Here's what happens in x11/swaylock if using *_MESON_TRUE instead of *_MESON_ENABLE:

meson.build:1:0: ERROR:  Value "true" for combo option "man-pages" is not one of the choices. Possible choices are: "enabled", "disabled", "auto".

Also, you probably will need a *_MESON_DISABLE. (doing what the _FALSE does for the _TRUE.)

Do we? I cannot find a single port even using *_MESON_FALSE. Same for *_MESON_NO. We also don't have a *_CONFIGURE_DISABLE or *_CONFIGURE_WITHOUT (though there are several ports pretending those exist...).

[tobik]

• Add opt_MESON_DISABLE too

[mat]

In D19085#408112, @tobik wrote:

Do we? I cannot find a single port even using *_MESON_FALSE. Same for *_MESON_NO.

Maybe we don't, I don't know, I just try to cover all bases. If we don't, then we don't :-)

[tobik]

Abandoning in favor of D19127...