[CMake] Simple CMakeLists.txt file not working with cmake version 2.6

[Michael Wild]

On 24. Dec, 2009, at 9:26 , Mahendra Ladhe wrote:

> Hi,
>   shown below is a simplified and relevant part of my CMakeLists.txt file.
> 
> add_custom_command (
>   OUTPUT  ${CMAKE_CURRENT_BINARY_DIR}/sample.bash
>   DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/sample.bash
>   COMMAND cp ARGS -f  ${CMAKE_CURRENT_SOURCE_DIR}/sample.bash .)

make the last line

    COMMAND "${CMAKE_COMMAND}" -E copy_if_different
      "${CMAKE_CURRENT_SOURCE_DIR}/sample.bash"
      "${CMAKE_CURRENT_BINARY_DIR}/sample.bash")

However, if it really is only copying you are interested in, why don't you use CONFIGURE_FILE(... COPYONLY)?

> 
> add_custom_target (sample.bash ALL DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/sample.bash)

I don't see why you want this... In any case, you need to rename this custom target, because it probably clashes with the custom command.

> 
>   Basically, I want to copy the 'sample.bash' script from source directory to the
> binary (build) directory when 'make' is run.
> I want this CMakeLists.txt to work on cmake version 2.4 as well as 2.6
> 
> On cmake 2.4, this works fine.
> mladhe at linux:~/cmake_expt/bld] make
> [  0%] Generating sample.bash
> [100%] Built target sample.bash
> mladhe at linux45:~/cmake_expt/bld] ls
> CMakeCache.txt  CMakeFiles  Makefile  cmake_install.cmake  sample.bash
> 
> However on cmake 2.6, I get the following.
> 
> mladhe at linux:~/cmake_expt/bld] make
> Scanning dependencies of target sample.bash
> make[2]: Circular CMakeFiles/sample.bash <- sample.bash dependency dropped.
> Built target sample.bash
> mladhe at linux45:~/cmake_expt/bld] ls
> CMakeCache.txt  CMakeFiles  Makefile  cmake_install.cmake
> 
> As can be seen, sample.bash file has not been copied.
> 
> How to make this CMakeLists.txt work on both cmake versions ?
> 
> Thank you,
> Regards,
> Mahendra Ladhe
> 

HTH

Michael