The patch fixes the firefox build issue:
From 4762480ae9cb8df4878286411f178d32db14eff0 Mon Sep 17 00:00:00 2001
From: Paul Smith <psmith@gnu.org>
Date: Tue, 31 May 2016 06:56:51 +0000
Subject: [SV 47995] Ensure forced double-colon rules work with -j.
The fix for SV 44742 had a side-effect that some double-colon targets
were skipped. This happens because the "considered" facility assumed
that all targets would be visited on each walk through the dependency
graph: we used a bit for considered and toggled it on each pass; if
we didn't walk the entire graph on every pass the bit would get out
of sync. The new behavior after SV 44742 might return early without
walking the entire graph. To fix this I changed the considered value
to an integer which is monotonically increasing: it is then never
possible to incorrectly determine that a previous pass through the
graph already considered the current target.
Version 4.2 (22 May 2016)
A complete list of bugs fixed in this version is available here:
http://sv.gnu.org/bugs/index.php?group=make&report_id=111&fix_release_id=106&set=custom
* New variable: $(.SHELLSTATUS) is set to the exit status of the last != or
$(shell ...) function invoked in this instance of make. This will be "0" if
successful or not "0" if not successful. The variable value is unset if no
!= or $(shell ...) function has been invoked.
* The $(file ...) function can now read from a file with $(file <FILE).
The function is expanded to the contents of the file. The contents are
expanded verbatim except that the final newline, if any, is stripped.
* The makefile line numbers shown by GNU make now point directly to the
specific line in the recipe where the failure or warning occurred.
Sample changes suggested by Brian Vandenberg <phantall@gmail.com>
* The interface to GNU make's "jobserver" is stable as documented in the
manual, for tools which may want to access it.
WARNING: Backward-incompatibility! The internal-only command line option
--jobserver-fds has been renamed for publishing, to --jobserver-auth.
* The amount of parallelism can be determined by querying MAKEFLAGS, even when
the job server is enabled (previously MAKEFLAGS would always contain only
"-j", with no number, when job server was enabled).
* VMS-specific changes:
* Perl test harness now works.
* Full support for converting Unix exit status codes to VMS exit status
codes. BACKWARD INCOMPATIBILITY Notice: On a child failure the VMS exit
code is now the encoded Unix exit status that Make usually generates, not
the VMS exit status of the child.
