Oh, the following is a comment I gave to the commit shown in the subject.
I though this would appear in Conversation of Christian's xdiff PR (#2734),
but it was singled out and sent to vim_dev for some reason.   I'm not sure
why it happened.  For the context of my message below, please visit
https://github.com/vim/vim/commit/f26446ce4900404508c0b909b0db954cb54d2a49

Thanks,
Kazubnobu

2018-03-24 9:34 GMT+09:00 Kazunobu Kuriyama <vim-dev-git...@256bit.org>:

> Since the inclusion of auto/config.h done just below implies that you
> leave the handling of the keyword inline to the compiler, i.e., letting
> it replace inline with __inline__ which replacement allows code using
> inline to compile even with -std=c89 or -ansi, this line is rather
> harmful and should be deleted since it breaks #define inline __inline__
> of auto/config.h. That's the cause of that miserable link error.
>
> I didn't think you tried to disable inline globally as there're a lot of
> inline functions in system headers. Though you called it "rolling it back
> for now" in #2732 (comment)
> <https://github.com/vim/vim/pull/2732#issuecomment-375815326> , you
> actually got it right with b667387
> <https://github.com/vim/vim/commit/b667387d4767b024adb49070d9ad846aee354c9a>
> which doesn't have that particular line. I confirm that the commit resolves
> the C89 issue affirmatively.
>
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