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

[Michael Wild]

This small test project works fine for me:

cmake_minimum_required(VERSION 2.6 FATAL_ERROR)
project(test NONE)
add_custom_command(
  OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/test.bash"
  COMMAND "${CMAKE_COMMAND}" -E copy_if_different
  "${CMAKE_CURRENT_SOURCE_DIR}/test.bash"
  "${CMAKE_CURRENT_BINARY_DIR}/test.bash"
  COMMENT "Creating ${CMAKE_CURRENT_BINARY_DIR}/test.bash"
  VERBATIM)
add_custom_target(create_test_bash ALL DEPENDS
  "${CMAKE_CURRENT_BINARY_DIR}/test.bash")


HTH

Michael

On 24. Dec, 2009, at 13:27 , Mahendra Ladhe wrote:

> Thanks Michael for your reply.
> I should have mentioned that every time I run 'make' (not cmake) I want to copy file only if 
> the original file in the source directory has changed.
> 
> I tried your suggestion, it works on cmake 2.4 but it still doesn't work on cmake 2.6
> mladhe at linux:~/cmake_expt/bld] make
> Built target sample.bash
> mladhe at linux:~/cmake_expt/bld] ls
> CMakeCache.txt  CMakeFiles  Makefile  cmake_install.cmake
> 
> So though it says 'Built target sample.bash', the file has not been copied.
> Also I believe CONFIGURE_FILE(... COPYONLY) will copy file only when running
> 'cmake' and not when running 'make'
> 
> I googled, but didn't find a solution that will work on both cmake versions.
> 
> Thanks,
> Mahendra
> 
> --- On Thu, 24/12/09, Michael Wild <themiwi at gmail.com> wrote:
> 
> From: Michael Wild <themiwi at gmail.com>
> Subject: Re: [CMake] Simple CMakeLists.txt file not working with cmake version 2.6
> To: "Mahendra Ladhe" <lml108 at yahoo.com>
> Cc: cmake at cmake.org
> Date: Thursday, 24 December, 2009, 1:06 AM
> 
> 
> 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
> 
> 
> 
> 
>      The INTERNET now has a personality. YOURS! See your Yahoo! Homepage. http://in.yahoo.com/