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Generate pkg-config files using Meson's pkgconfig module

Chun-wei Fan requested to merge pkg-config-3-24 into gtk-3-24

Hi,

This attempts to switch from generating pkg-config files with hard-coded packages/libraries via templates for the sake of autotools build compatibility to using Meson's pkgconfig module to do that for us for the dependencies that are being used, as:

  • We may have different naming schemes for the packages that we link to, as they may or may not be found by pkg-config (e.g. ZLib), meaning that -lz may be wrong, for instance.
  • Make the pkg-config file stuff be in their subdirs instead.
  • We don't need to construct strings for the dependent packages and libraries in the .pc files in addition to feeding the dependencies in the build targets/libraries. We do sadly, continue need to separate the dependencies by their types, as we actually did before, since the pkgconfig module currently see requires: and libraries: (and their _private counterparts) separately, and dependencies can have different build systems.
  • For the -Wl,... items that we put into the pkg-config files, we continue to do so due to specific linking needs. For the macOS ones, it might be good if someone can let me know that I can just feed these as dependencies into the libraries: section.

With blessings, thank you!

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