tree b8d81835dfbb6c450bd03038f32d5429986e7d0c
parent 9629d103872aca39a658efb77cced5df0bb07e93
author John Ericson <John.Ericson@Obsidian.Systems> 1641068307 +0000
committer Copybara-Service <copybara-worker@google.com> 1658783144 -0700

[cmake] Support custom package install paths

Firstly, we we make an additional GNUInstallDirs-style variable. With
NixOS, for example, this is crucial as we want those to go in
`${dev}/lib/cmake` not `${out}/lib/cmake` as that would a cmake subdir
of the "regular" libdir, which is installed even when no one needs to do
any development.

Secondly, we make *Config.cmake robust to absolute package install
paths. We for NixOS will in fact be passing them absolute paths to make
the `${dev}` vs `${out}` distinction mentioned above, and the
GNUInstallDirs-style variables are suposed to support absolute paths in
general so it's good practice besides the NixOS use-case.

Thirdly, we make `${project}_INSTALL_PACKAGE_DIR` CACHE PATHs like other
install dirs are.

Reviewed By: sebastian-ne

Differential Revision: https://reviews.llvm.org/D117973

GitOrigin-RevId: ac0d1d5c7b7e0d572e35e31e0b59be765ca42a48