[PATCH 2/4] Fix up Makefile for build.

[Carl Worth]

On Sun, 11 Apr 2010 19:44:52 -0400, Aaron Ecay <aaronecay at gmail.com> wrote:
> Must set extra_c(xx)flags before including subdir Makefile.local's,
> so that there is a blank slate that the subdirs can add on to.

That part looks just fine, but it's intermixed with:

> Must include subdir Makefile.local's before global one, otherwise
> the compat sources are not added to the list of those to be
> compiled.

This part, which seems not ideal. I would have preferred it if we could
have avoided fiddly ordering issues with our Makefile includes. The
concept is that we are writing a single, flat Makefile but just
maintaining it in pieces. And traditional Makefile rules don't depend on
ordering so much. But the change of this variable assignment:

But the patch switches to an order-dependent variable assignment for
notmuch_compat_srcs here:

> -notmuch_compat_srcs =
> +notmuch_compat_srcs :=

And testing this a bit, it does seem necessary to do this since we are
already using the order-dependent $(dir) variable in the expansion of
notmuch_compat_srcs.

So I've convinced myself, and pushed this patch as well. (I even tested
by manually setting HAVE_GETLINE to 0 in Makefile.config)

-Carl
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