Hi George,
> The obvious way to compile front-end tools is to create another directory, > e.g., "front-end-build" and run cmake therein to re-configure and build > with a front-end compiler. > > However, since only a relatively small subset of the files needs to be > compiled for the front-end, it is desirable to do this within the same build > This is a common case that occurs when cross compiling where certain targets are used to generate files used in the rest of the build. Using different build directories is the typical way, but you can reduce the host build as much a possible by creating a BuildTools or CrossTools custom target with depends only on the targets needing to be build on the host system. This way, you can build only the subset needed on the host and in the cross-build, just point the host build directory. This is how both VTK and ParaView do it. Trying to specify multiple compilers isn't so straight forward. Consider the entire platform that goes in to cross compiling: you have the entire build toolset, but then you also have the entire find infrastructure that needs to look in different places for includes and libraries. There's an entire stack of variables, tools, and settings that are needed to build on a given platform and you would basically need a whole duplicate set generated from a secondary configure run to make it work in the general case. This is what is effectively happening anyways in the two-builds scenario. - Chuck
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