[CMake] custom_command

[Javier Gonzalez]

Hi all,

I'm having trouble creating files using ADD_CUSTOM_COMMAND. Take a look
at this
CMakeLists.txt:

ADD_CUSTOM_COMMAND( OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Dir_2/file
                                                      COMMAND mkdir -p
${CMAKE_CURRENT_BINARY_DIR}/Dir_2
                                                      COMMAND cp
${CMAKE_CURRENT_SOURCE_DIR}/Dir_2/file.in 
${CMAKE_CURRENT_BINARY_DIR}/Dir_2/file
                                                      DEPENDS
${CMAKE_CURRENT_SOURCE_DIR}/Dir_2/file.in)

ADD_CUSTOM_COMMAND( OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Dir_1/file
                                                     COMMAND mkdir -p
${CMAKE_CURRENT_BINARY_DIR}/Dir_1
                                                     COMMAND cp
${CMAKE_CURRENT_SOURCE_DIR}/Dir_1/file.in 
${CMAKE_CURRENT_BINARY_DIR}/Dir_1/file
                                                     DEPENDS
${CMAKE_CURRENT_SOURCE_DIR}/Dir_1/file.in)

ADD_EXECUTABLE( my_exe my_source.cc
                                      Dir_1/file
                                      ${CMAKE_CURRENT_BINARY_DIR}/Dir_2/file
)

If I build in the source directory it works (that meaning that the files
are created). When I do it in another directory, only the second one is
created but the build succeeds. The file my_source.cc is a dummy file
with just an empty main().

I expected that it would fail, since neither
${CMAKE_CURRENT_BINARY_DIR}/Dir_1/file nor
${CMAKE_CURRENT_SOURCE_DIR}/Dir_1/file exist and is not created but
there are no complains!


If I add a dummy target for each file and then add the dependencies,
then it works but I thought that was not the idea.

What am I missing?

thanks,

Javier