@ofborg build cmake

@ofborg build cmakeMinimal

I adjusted the style and changed the order to group all the non-conditional flags.

@wolfgangwalther, what do you think about the current style?

The last commit says:

This enables developers to get the default CMake flags provided by Nixpkgs without having to use cmakeConfigurePhase.

I don't understand the reason for that last commit, yet. Why is that important, what would you do with those flags?

In a build flow where other build tools control CMake, the package developer needs to configure the command-line arguments for CMake without executing CMake itself. A Bash function to provide the flags without running the whole cmakeConfigurePhase might be helpful in such circumstances.

Update: Such use cases are essentially edge cases. I shouldn't emphasize them too much.

Would it sound more clearly if the function is called setCmakeDefaultFlags?

Rebased and resolved merge confilcts.

I split the source-independent cmakeDefaultFlags and define it directly at the beginning of setup-hook.sh. The source-dependent -DCMAKE_INSTALL_DOCDIR is added inside cmakeConfigurePhase, but the logic to parse shareDocName from cmakeLists.txt is split out as a Bash function parseShareDocName.

@wolfgangwalther @AndersonTorres How do you fell about the new implementation? I could roll back to the previous one if the latter is preferred.

OfBorg fails to build cmakeMinimal, complaining about unbound Bash variable CXX.

The CC and CXX environment variables seem to be set by the setup hook provided by the CC wrapper, which is sourced after sourcing our cmake setup hooks.