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Summary:
simply sets a variable when the source is under version control. use it to
auto-enable Debug builds. there are also plans to switch special assertion
logic on in KIO when used from git, so there definitely is a more generic
use case of wanting to control behavior based on whether it the source is
likely used to make a development or production build.
conceivably the module could be used in the future to get git rev-parse or
the like, hence the generic name.
Test Plan: with .git the var is true, without it is false
Reviewers: kde-buildsystem, dfaure
Reviewed By: dfaure
Subscribers: apol, kossebau, kde-frameworks-devel
Tags: #frameworks, #build_system
Differential Revision: https://phabricator.kde.org/D24159
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