Git can be told to apply language-specific rules when generating diffs.
Enable this for C source code files (*.c and *.h) so that function names
are printed right. Specifically, doing so prevents "git diff" from
mistakenly considering unindented goto labels as function names.

This has the same effect as adding

    [diff "default"]
        xfuncname = "^[[:alpha:]$_].*[^:]$"

to your git config file.

e.g get

    @@ -10,7 +10,7 @@ int main(void)

instead of

    @@ -10,7 +10,7 @@ again:

This makes use of the gitattributes(5) infrastructure.

Link: <https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=218dd85887da3d7d08119de18e9d325fcf30d7a4>
Link: <https://git.kernel.org/pub/scm/git/git.git/commit/?id=e82675a040d559c56be54255901138a979eeec21>
Reviewed-by: Alejandro Colomar <alx@nginx.com>
Signed-off-by: Andrew Clayton <a.clayton@nginx.com>