Including apple_sdk.sdk is generally a recipe for a bad time on LLVM 3.8
and above, since you end up with bad headers in the wrong place that hurt
the new libc++ in 3.8 and above. In this case, qt only wanted the super-
generic SDK for CUPS headers, which we can just depend on directly now.
So that pkg-config can be used to find 'moc' etc. (Currently it points
to a non-existing path.)
Fixes#22945 ('Linux kbuild incompatible with "nix-shell -p qt5.full"').
- qtbase builds on darwin
- Downstream qmake and cmake build configurations supported
Darwin-specific changes:
Prevent `qmake -project` from adding build support files in the temp
directory to the project.
Shrink the temp directory used for building with qmake.
The issue here is that `lndir` recreates the entire directory structure
of the module we are merging into the temporary build environment. On
darwin, the framework directory structures mean that this shadow
directory tree is 17MB even though the file contents are all symlinks
into the store.
To address this, we symlink the framework directories explicitly and
use `lndir` for everything else.
