tree c684fe3b4d30ae9e0211c3a67263337a3f234dda
parent 0ea27d728d34e3e2a1eae6f54dbe6ca0822a0b4a
author bungeman <bungeman@chromium.org> 1565126873 -0400
committer GitHub <noreply@github.com> 1565126873 -0400
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Recommend MD over MMD for header dependencies.

The MMD flag will silently omit includes found through pointy brackets or system include paths. This can lead to issues not only when system headers change, but any paths included through the isystem flag. Because the isystem flag implicitly turns off warnings as errors it has often come to be used as a "not my code" flag used with local third party dependencies which may be frequently updated or changed for debugging. As a result, it is far safer to default to MD (which includes all include dependencies) in this example.