[CMake] Optional .cmake files and rebuilding makefiles

[Brad King]

Richard Wackerbarth wrote:
> Following Brad's suggestion, I have
> 
> SET(HAS_PASSED_MY_TEST 0)
> INCLUDE(${CMAKE_CURRENT_BINARY_DIR}/Passed_My_Test.cmake OPTIONAL)
> 
> IF (NOT HAS_PASSED_MY_TEST)
>    ADD_TEST( RunMyTest
>       ${CMAKE_CURRENT_BINARY_DIR}/MyTestProgram
>        )
> ENDIF (NOT HAS_PASSED_MY_TEST)
> 
> 
> If the test succeeds, it writes the file
> ${CMAKE_CURRENT_BINARY_DIR}/Passed_My_Test.cmake
> as
> SET(HAS_PASSED_MY_TEST 1)
> 
> The next time that cmake runs, the test is suppressed until I clean  out 
> the binary directory tree.
> This is just what I want to happen.
> 
> My problem is that it takes some additional change to get cmake to run.
> If I run the test and have no other changes, the next run still  
> includes the test because nothing triggers cmake to run.
> But as soon as I change some other CMakeList.txt file, cmake runs and  
> rebuilds the makefiles to suppress the test.
> 
> How can I set up a dependency which both tolerates the non-existence  of 
> "Passed_My_Test.cmake" and triggers the rebuilding of the  makefiles 
> when this file is created or changes?

CMake should be able to re-run automatically when the file is removed. 
Please submit a bug report here:

http://www.cmake.org

for this to be investigated.

Meanwhile you can probably fix the problem by writing an empty file 
instead of deleting it.  The new modification time should cause CMake to 
re-run.

-Brad