Add a `CMAKE_TRY_COMPILE_PLATFORM_VARIABLES` variable to specify a list
of custom variables to be forwarded to a `try_compile` test project.
This will be useful for platform information modules or toolchain files
to forward some platform-specific set of variables from the host project
(perhaps set in its cache) to the test project so that it can build the
same way.
This directory contains tests that run CMake to configure a project
but do not actually build anything. To add a test:
1. Add a subdirectory named for the test, say ``<Test>/``.
2. In ``./CMakeLists.txt`` call ``add_RunCMake_test`` and pass the
test directory name ``<Test>``.
3. Create script ``<Test>/RunCMakeTest.cmake`` in the directory containing::
include(RunCMake)
run_cmake(SubTest1)
...
run_cmake(SubTestN)
where ``SubTest1`` through ``SubTestN`` are sub-test names each
corresponding to an independent CMake run and project configuration.
One may also add calls of the form::
run_cmake_command(SubTestI ${CMAKE_COMMAND} ...)
to fully customize the test case command-line.
Alternatively, if the test is to cover running ``ctest -S`` then use::
include(RunCTest)
run_ctest(SubTest1)
...
run_ctest(SubTestN)
and create ``test.cmake.in``, ``CTestConfig.cmake.in``, and
``CMakeLists.txt.in`` files to be configured for each case.
4. Create file ``<Test>/CMakeLists.txt`` in the directory containing::
cmake_minimum_required(...)
project(${RunCMake_TEST} NONE) # or languages needed
include(${RunCMake_TEST}.cmake)
where ``${RunCMake_TEST}`` is literal. A value for ``RunCMake_TEST``
will be passed to CMake by the ``run_cmake`` macro when running each
sub-test.
5. Create a ``<Test>/<SubTest>.cmake`` file for each sub-test named
above containing the actual test code. Optionally create files
containing expected test results:
``<SubTest>-result.txt``
Process result expected if not "0"
``<SubTest>-stdout.txt``
Regex matching expected stdout content
``<SubTest>-stderr.txt``
Regex matching expected stderr content, if not "^$"
``<SubTest>-check.cmake``
Custom result check.
Note that trailing newlines will be stripped from actual and expected
test output before matching against the stdout and stderr expressions.
The code in ``<SubTest>-check.cmake`` may use variables
``RunCMake_TEST_SOURCE_DIR``
Top of test source tree
``RunCMake_TEST_BINARY_DIR``
Top of test binary tree
and an failure must store a message in ``RunCMake_TEST_FAILED``.
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