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

[John McGehee]

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.



John McGehee
http://www.voom.net