[CMake] write file if different?

[J Decker]

On Tue, May 28, 2013 at 1:07 PM, Matthew Woehlke
<matthew.woehlke at kitware.com> 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.
>

I would add a minor note; this seems to be a good way, but you don't
really need to delete the temp file, if you build it in the
${CMAKE_BINARY_DIR}, so it's not laying around in source trees.


It would be nice if such a simple thing didn't require launching a
seperate instance of cmake to do; since it's already in cmake, would
think there would be a way to just 'EXEC( ... )' instead of 'cmake -E
(...)'

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> Matthew
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