When a target uses objects from another target which provides modules as
sources, the modules provided by the referenced target must also be
treated as if they were provided by the referencing target. Add the
concept of "forwarding" modules so that consumers can use modules
created by these sources as well.
Note that this is only sensible for Fortran where module usages are
implicit as far as CMake's visibility model is concerned. C++ modules
have their own concept of visibility which does not require or support
such `$<TARGET_OBJECTS>` reuse in this way.
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Superseded by ``Tests/RunCMake/``.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.
Ben Boeckel
d2fa56772f