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Re: [PATCH 1/1] Makefile: use `git ls-files` to list header files, if possible

Hi Junio,

On Tue, 5 Mar 2019, Junio C Hamano wrote:

> Jeff King <peff@xxxxxxxx> writes:
> > This makes sense to me, though as you noted elsewhere, it doesn't fix
> > the gcrypt problem, since that file unconditionally wants to look at the
> > system gcrypt.h (and we control at the Makefile level whether we
> > actually look at sha256/gcrypt.h).
> Hmm, is that because the header check target does not know which *.h
> files we ship are actually used in a particular build?
> After a normal build, with dynamic dependency checking on, we would
> have sufficient information to figure it out.  Would that help?

Yes, *if* the dynamic dependency checking is in effect (read: if we are
compiling with GCC).

However, I think that one of the benefits of the current approach is that
hdr-check finds issues also in headers that are *not* part of the current
build. Read: once hdr-check is run as part of the CI build, it is harder
for some random contributor to break hdr-check for somebody else with
different compile time options.