Re: [PATCH v1] travis-ci: override CFLAGS properly, add -Wdeclaration-after-statement

Roberto Tyley [off-list ref] writes:

I've not personally run checkpatch.pl (as Peff mentioned, it's not
actually a documented part of the Git project's recommend contribution
workflow) - I'm still trying to understand whether it will restrict
it's errors to just the things that are introduced in a patch,

Yes, it works as a filter to pass a submitted patch through to catch
issues on the new lines.  You can obviously diff the current state
with an empty tree and feed the result to it, which would give you
all the existing issues ;-) but that is not very useful.