Fixed FLAP's CMakeLists

[LiamBindle]

Targets should be getting exported properly now. Installation should be
correct now too. When you do find_package(FLAP), FACE and PENF are found
as well.

I also pass CMAKE_POSITION_INDEPENDENT_CODE to the ExternalProjects so FACE and PENF are built with position independent code if FLAP is.

[LiamBindle]

With these changes FLAP should be built like

cd <build directory>
cmake -DCMAKE_INSTALL_PREFIX=<install location> <FLAP's source code>
make -j install

This will install FLAP, PENF, and FACE in <install location>. You can use FLAP in other CMake projects by doing find_package(FLAP). I set it up so that FLAPConfig.cmake gets added to the CMake registry, so you shouldn't have to do anything to get CMake to find FLAPConfig.cmake automatically. If it doesn't find FLAPConfig.cmake automatically, you will have to do cmake -DCMAKE_PREFIX_PATH=<install location> . to point CMake to where you installed FLAP.

[mathomp4]

@LiamBindle Thanks for this. I just got back off of leave and hope I can get to it soon. With ESMF 8 being released, it might be time to do some re-working of Baselibs to start afresh.

[LiamBindle]

@mathomp4 Sounds good. Let me know if there's anything I can help with!

[mathomp4]

Wait. Why am I even waiting. I'm currently building with old make anyway. This has to be better! 👍

[mathomp4]

@LiamBindle One query: did you need to make any changes to my PENF or FACE forks?

[LiamBindle]

No, I didn't have to make any changes to your PENF or FACE forks

[mathomp4]

Surprising, but nice! If I get things working sort of well with my public GitHub baseline, I might ask you to be a test builder.

[LiamBindle]

Sure, I'd be happy to do that. Just let me know.