[CMake] MACOSX_BUNDLE targets fail as custom target dependencies

[Brad King]

Allan Odgaard wrote:
> I have the following CMakeLists.txt file:
> 
>     project(foo)
>     add_executable(foo MACOSX_BUNDLE main.cc)
>     add_custom_target(run_foo echo running foo DEPENDS foo)
> 
> This is what I get (Mac OS X Leopard, CMake 2.6.0 and 2.7 from CVS):
> 
>     % make run_foo
>     Scanning dependencies of target foo
>     [100%] Building CXX object CMakeFiles/foo.dir/main.o
>     Linking CXX executable foo.app/Contents/MacOS/foo
>     [100%] Built target foo
>     Scanning dependencies of target run_foo
>     make[3]: *** No rule to make target `foo', needed by
> `CMakeFiles/run_foo'.  Stop.
>     make[2]: *** [CMakeFiles/run_foo.dir/all] Error 2
>     make[1]: *** [CMakeFiles/run_foo.dir/rule] Error 2
>     make: *** [run_foo] Error 2
> 
> Without the MACOSX_BUNDLE setting of the target, or trying to build the
> same project on Linux, it works.

If it works on any platform it is purely by accident.  That is not the
syntax to add a target-level dependency.  Try this:

  project(foo)
  add_executable(foo MACOSX_BUNDLE main.cc)
  add_custom_target(run_foo echo running foo)
  add_dependencies(run_foo foo)

The DEPENDS option to add_custom_target adds file-level dependencies
(for example could list the output of an add_custom_command).
Target-level dependencies are added by add_dependencies.

-Brad