How does this work with multiple languages and the project() command and enable_language() commands?
For instance you want to use the host c++ compiler and a toolchain specified compiler for c and c++. When project() enables the c++ compiler it runs through a bunch of scripts to find and test the compiler also setting several CMAKE_<lang>_* variables to use that compiler. These variables also happen to be the default compile options for the build types when using that compiler. Then the same thing happens with the tool-chain specified compiler for these languages how do you track that the variables are different for these two toolchains? Are these variables now project scoped and for any given project it is limited to one toolchain per language per project?
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