[cmake-developers] Integration of clang-tidy

[Daniel Pfeifer]

Hi,

I implemented the integration of `clang-tidy` along the lines of the
`include-what-you-use` integration.
There is a new `<LANG>_CLANG_TIDY` target property that is initialized
with the value of the `CMAKE_<LANG>_CLANG_TIDY` variable.
It contains the command line for `clang-tidy` as a ;-list.

Example use:

$ cmake -DCMAKE_CXX_CLANG_TIDY:STRING="clang-tidy;-checks=-*,readability-*" ..
$ cmake --build .

It is also possible to let `clang-tidy` apply fixit hints directly:

$ cmake -DCMAKE_CXX_CLANG_TIDY:STRING="clang-tidy;-checks=-*,readability-redundant-string-cstr;-fix"
..

The output is recognized by CTest's diagnostic parser. I haven't
checked how they look on CDash.

cheers, Daniel
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