V3 [PATCH 5/5] gnulib: Support variables from the top level Makefile

[Christian Biesinger]

On Fri, Jan 1, 2021 at 1:07 AM H.J. Lu via Gdb-patches
<gdb-patches@sourceware.org> wrote:
>
> On Thu, Dec 31, 2020 at 3:50 PM Joseph Myers <joseph@codesourcery.com> wrote:
> >
> > On Sat, 19 Dec 2020, H.J. Lu via Gcc-patches wrote:
> >
> > > Work around what appears to be a GNU make bug handling MAKEFLAGS
> > > values defined in terms of make variables, as is the case for CC and
> > > friends when we are called from the top level Makefile.
> >
> > This description, and the comment in Makefile.am repeating it, is rather
> > unhelpful as it provides no way for a reader to know what the supposed bug
> > is.  Reviewers need to be able to work out whether the proposed workaround
> > is correct or the right approach for working around the bug.  Maintainers
> > in future need to be able to tell what the bug is.  So the comment needs
> > to explain what the bug is and give a reference to a report for the bug in
> > the GNU make bug tracker, so that subsequent maintainers can look at that
> > bug to tell if the workaround is still needed at all.
> >
>
> I just copied the same workaround from other directories in GCC.

But could you explain under which circumstances the bug happens?

Christian