Re: make check fails? (emacs-26.1 w/modules)

[Paul Eggert <eggert@cs.ucla.edu>]

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Thanks for tracking this down. It's worth a note in etc/PROBLEMS; I installed 
the attached into the emacs-26 branch.

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From 41cdda22c78eb0b00612ce25cdb356dd64322fcc Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Wed, 12 Sep 2018 07:53:43 -0700
Subject: [PATCH] * etc/PROBLEMS: Document Ubuntu 16.04 issue.

---
 etc/PROBLEMS | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/etc/PROBLEMS b/etc/PROBLEMS
index 15e2b3359d..7dfafe04de 100644
--- a/etc/PROBLEMS
+++ b/etc/PROBLEMS
@@ -2986,6 +2986,15 @@ as a macro.  If the definition (in both unex*.c and malloc.c) is wrong,
 it can cause problems like this.  You might be able to find the correct
 value in the man page for a.out(5).
 
+* 'make check' failures
+
+** emacs-module-tests fail on Ubuntu 16.04
+
+This is due to a bug in GCC that was fixed in 2015; see
+<https://lists.gnu.org/r/emacs-devel/2018-09/msg00548.html>.
+You can work around the problem by using a later version of GCC or of
+Ubuntu, or by configuring without modules.
+
 * Problems on legacy systems
 
 This section covers bugs reported on very old hardware or software.
-- 
2.17.1