[CMake] Putting the git commit hash in a cmake variable

[Chuck Atkins]

>     COMMAND "${GIT_EXECUTABLE}" describe --always HEAD
>

git describe is nice way to do it since you can get a monotonic-ish
increasing version number


>
>     string(REGEX REPLACE "^.*-(.*)-g.*$" "\\1" MYAPP_VERSION_MICRO
> "${MYAPP_VERSION}")
> ...
>     set(MYAPP_VERSION_MICRO "0")
>

Only tangentially related, CMake commands and functions that deal with
version information refer to the 4th component as _TWEAK.

- Chuck
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