[CMake] Wanted : Macro to copy files if touched

[Filipe Sousa]

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John Biddiscombe wrote:
> Thanks,
> 
> I've never used cmake -E - how does one call this from inside  CMake 
> script. Are you implying that I simply create a custom rule and use 
> cmake -E as the command for the copy?


You can use a custom rule or define a macro to handle file copy:

MACRO(COPY_IF_DIFFERENT source dest
  EXEC_PROGRAM(
    ${CMAKE_COMMAND}
    ARGS -E copy_if_different ${source} ${dest})
ENDMACRO(MACRO(COPY_IF_DIFFERENT)

use COPY_IF_DIFFERENT with FOREACH

The files are copied when CMakeLists.txt is processed. If you need the
files to be copied when a specific target is built use a custom rule

ADD_CUSTOM_COMMAND(
  TARGET     ${target}
  POST_BUILD
  COMMAND    ${CMAKE_COMMAND}
  ARGS       -E copy_if_different ${source} ${dest}
  )

PRE_BUILD - run before all other dependencies
PRE_LINK - run after other dependencies
POST_BUILD - run after the target has been built

- --
Filipe Sousa
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