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83e0c70de5
When compiling cc65, it will by default place the git hash (if available) of the checked out commit in the version string. This isn't useful when building a package for a Linux distribution, since there either won't be an upstream git hash if there is one at all. Thus we replace GIT_SHA with a more versatile BUILD_ID, which can be defined to any arbitrary string. When building, its contents will be appended to the version string instead of the git hash. If BUILD_ID is not defined by the user the behaviour will be exactly the same as before. That means BUILD_ID gets automatically defined to Git <GIT_SHA>, if it can be determined from a checkout.