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Fix the language checks added by commit90dead024c(CheckCompilerFlag: unified way to check compiler flags per language, 2020-09-25, v3.19.0-rc1~88^2), commit10ae907de0(CheckSoureCompiles: Add a unified way to check if a source compiles, 2020-09-14, v3.19.0-rc1~118^2~1), and commit357e2ef429(CheckSoureRuns: Add a unified way to check if a source runs, 2020-09-14, v3.19.0-rc1~118^2) to work when variables of the language names are set. Fixes: #21500
CMake Tests Directory ********************* This directory contains the CMake test suite. See also the `CMake Source Code Guide`_. .. _`CMake Source Code Guide`: ../Help/dev/source.rst Many tests exist as immediate subdirectories, but some tests are organized as follows. * ``CMakeLib/``: Source code, used for tests, that links to the ``CMakeLib`` library defined over in ``Source/``. * ``CMakeOnly/``: Deprecated. Tests that run CMake to generate a project but not build it. Superseded by ``Tests/RunCMake/``. * ``Find*/``: Tests for specific find modules that can only be run on machines with the corresponding packages installed. They are enabled in ``CMakeLists.txt`` by undocumented options used on CI builds. * ``Module/``: Tests for specific CMake modules. * ``RunCMake/``: Tests that run CMake and/or other tools while precisely checking their return code and stdout/stderr content. Useful for testing error cases and diagnostic output.