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625b8f9076
Since commit v3.9.0-rc1~230^2~2 (ninja: break unnecessary target
dependencies, 2017-04-17) we unconditionally generate a phony edge for
target ordering. It is needed in case a later target depends on it.
However, if the phony edge has no inputs then `ninja -d explain` prints:
ninja explain: output ... of phony edge with no inputs doesn't exist
Furthermore the phony edge's output is considered dirty and can cause
dependents to be incorrectly considered dirty. Avoid this by always
generating at least one input to the target ordering phony edges.
If we have no real dependencies just use a path that always exists.
Fixes: #17942
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 Superseded by ``Tests/RunCMake/``.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.