Keep track of CPS files we have imported in CMake's state, and use this
(instead of the prior, temporary work-around that used `<name>_CONFIG`)
as a guard for trying to import more than once from the same file. This
has two advantages; first, it is robust against finding the same package
name in different locations in alternating searches, and second, it
allows us to load additional appendices associated with a root package
that has already been loaded.
Fixes: #26731
CMake Tests Directory
*********************
This directory contains the CMake test suite.
See also the `CMake Testing Guide`_ and the `CMake Source Code Guide`_.
.. _`CMake Testing Guide`: ../Help/dev/testing.rst
.. _`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Superseded by ``Tests/RunCMake/``.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.
See `RunCMake/README.rst`_.
.. _`RunCMake/README.rst`: RunCMake/README.rst
Matthew Woehlke
de5fa2ae53