[CMake] ADD_CUSTOM_COMMAND() cannot depend on ADD_CUSTOM_TARGET()

[Michael Hertling]

On 02/15/2011 12:58 AM, John McGehee wrote:
> I have a custom command that depends on a custom target.  In the example below, it is as if
>    ADD_CUSTOM_COMMAND(... DEPENDS t ...)
> has no effect:
> 
> # CMakeLists.txt:
> CMAKE_MINIMUM_REQUIRED(VERSION 2.8 FATAL_ERROR)
> PROJECT(CUSTOMDEPENDS NONE)
> ADD_CUSTOM_TARGET(t
>     ${CMAKE_COMMAND} -E echo "Building target t"
>     VERBATIM)
> ADD_CUSTOM_COMMAND(OUTPUT stamp
>     COMMAND ${CMAKE_COMMAND} -E touch stamp
>     DEPENDS t
>     VERBATIM)
> ADD_CUSTOM_TARGET(main ALL
>     ${CMAKE_COMMAND} -E echo "Building target main"
>     DEPENDS stamp
>     VERBATIM)
> 
> # Fedora 11 with CMake 2.8 generating GNU make
>> make
> Scanning dependencies of target t
> Building target t
> [  0%] Built target t
> Scanning dependencies of target main
> make[2]: *** No rule to make target `t', needed by `stamp'.  Stop.
> make[1]: *** [CMakeFiles/main.dir/all] Error 2
> make: *** [all] Error 2
> 
> Target t is built, and I can 'make t' myself, so the target is in fact there.  
> 
> My particular situation is that I am,
>   1. Creating a language binding using SWIG
>   2. Compiling the resulting C#
> If you look just beneath the surface, this is the same situation illustrated in the above example.  SWIG and C# themselves are working fine.  
> 
> Is there any way to work around this?  Shall I enter this as a bug?
> 
> This issue was raised earlier as http://www.cmake.org/pipermail/cmake/2010-November/040541.html but no solution was given.  The excellent example is from that earlier message.

This will be fixed in CMake 2.8.4, see [1].

Regards,

Michael

[1] http://www.mail-archive.com/cmake@cmake.org/msg34598.html