In the `try_compile` source file signature we propagate the caller's
value of `CMAKE_<LANG>_FLAGS` into the test project. Extend this to
propagate `CMAKE_<LANG>_FLAGS_<CONFIG>` too instead of always using the
default value in the test project. This will be useful, for example, to
allow the MSVC runtime library to be changed (e.g. `-MDd` => `-MTd`).
However, some projects may currently depend on this not being done,
so we need to activate the behavior using a policy.
This change was originally made by commit v3.6.0-rc1~160^2 (try_compile:
Honor CMAKE_<LANG>_FLAGS_<CONFIG> changes, 2016-04-11) but without the
policy and so had to be reverted during the 3.6 release candidate cycle.
Fixes#16174.
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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