Brad King e0228e2b04 cmake: Improve '-E create_symlink' edge case handling (#14713)
The logic added by commit ffc0b5e4 (Overwrite the symlink if it already
exists, 2007-02-15) does not recognize and remove existing broken links
before replacing them.  Improve the logic to remove any existing
destination file or link (but not directory).  On failure, report an
error message explaining why the existing path could not be removed or
the new one could not be created.

Add a RunCMake.CommandLine test to cover 'cmake -E' cases.  Start with
test cases covering 'cmake -E create_symlink' behavior on UNIX platforms.
2014-01-20 14:02:21 -05:00
..
2013-12-19 16:17:59 +01:00
2013-11-07 11:06:39 +01:00
2013-10-08 18:11:22 +02:00
2013-10-21 12:54:20 -04:00

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.

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
   ``<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``.