[CMake] Add a build event that depends on a target

[Pawel Veselov]

Hi.

Is it possible in some way to add a build event that depends on a target
(different target than what the build event is for)? add_custom_command()
doesn't seem to support that.

What I'm trying to do is:
1) Have target "test", which builds tests
2) Have target "program". Have a post-build build event
   that executes test, so that the program is only
   fully built when the tests are successful

Simple:
------ cut ------
add_executable(test test.c)
add_executable(program program.c)
enable_testing()
add_test(NAME test COMMAND test)
add_custom_command(
  TARGET program
  POST_BUILD
  COMMAND ${CMAKE_CTEST_COMMAND} -R test
)
------ cut ------

doesn't work, at least in parallel build, there is nothing that prevents
the unit test to run before test is built (which is what happens).

Thank you!
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