I have exposed build-time information to an application in the past. The 
approach I chose leveraged a Run Script build phase that overwrote the contents 
of a plist or a header file (I’ve used both). I created the initial file and 
added it to git. Then, I ended up assuming that changes to the plist or header 
file were negligible from the perspective of source control with:

    git update-index --assume-unchanged

> On Apr 29, 2015, at 6:39 AM, Torsten Curdt <tcu...@vafer.org> wrote:
> 
> I would like to embed the timestamp of the build into my executable.
> 
> I know there is __DATE__ and __TIME__ but converting those into a timestamp
> at runtime isn't ideal.
> 
> So I guess I somehow need to make the output of date +%s available to the
> preprocessor. But user defines allow only static values aren't they?
> 
> I am not aware that a run script phase can export anything but files.
> 
> How would you do this?
> 
> Hope this is not too OT as this is more Xcode/build tools related.
> Happy to ask elsewhere if it is.
> 
> cheers,
> Torsten
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