[Development] Getting defines from pkg-config for Qt modules

[Jeandet Alexis]

Hello,

I already asked this on IRC but I got no answer.
On Fedora and Ubuntu I can say that "pkg-config --cflags Qt5[any
module]" does only provides include flags and no defines such as
-DQT_CORE_LIB or -DQT_GUI_LIB.

As an example "pkg-config --cflags panelw" gives "-D_GNU_SOURCE
-D_DEFAULT_SOURCE "

So my questions are:
1) Is this normal/expected?
2) Why not providing this flags?
3) Does a patch to provides this flags would be accepted?

This would help to improve Qt support in Meson and I guess others build
systems using pkgconfig.

Best regards,
Alexis.
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