[CMake] write file if different?

[Michael Wild]

On 28.05.2013 22:07, Matthew Woehlke wrote:
> Is there a built-in way to write a string to a file (a la FILE(WRITE))
> that will only write the file if the content would be different? (Or
> does FILE(WRITE) already work this way despite no obvious hint in the
> documentation that it does?)
> 
> Right now I am writing to a temporary file and running cmake -E
> copy_if_different, then removing the temporary file, but this seems
> inelegant and I am wondering if there is a better solution.
> 

AFAIK the file is written unconditionally, but you can then use
configure_file(... COPYONLY) instead of a round-about execute_process()
that calls cmake -E copy_if_different.

Michael