From b854606885ca849e0b5a1488b6dc82105d3c138d Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Wed, 7 Dec 2011 22:41:04 -0800
Subject: [PATCH] AC_LANG_BOOL_COMPILE_TRY(C): port to g++ with warnings

* lib/autoconf/c.m4 (AC_LANG_BOOL_COMPILE_TRY(C)): Use the
array as well as setting it, to pacify g++.  Reported by
Werner Lemberg in
<http://lists.gnu.org/archive/html/autoconf/2011-12/msg00005.html>.
---
 ChangeLog         | 8 ++++++++
 lib/autoconf/c.m4 | 3 ++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index f9f4b907..0f67f890 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2011-12-07  Paul Eggert  <eggert@cs.ucla.edu>
+
+	AC_LANG_BOOL_COMPILE_TRY(C): port to g++ with warnings
+	* lib/autoconf/c.m4 (AC_LANG_BOOL_COMPILE_TRY(C)): Use the
+	array as well as setting it, to pacify g++.  Reported by
+	Werner Lemberg in
+	<http://lists.gnu.org/archive/html/autoconf/2011-12/msg00005.html>.
+
 2011-12-05  Paul Eggert  <eggert@cs.ucla.edu>
 
 	doc: document GNU make's \#
diff --git a/lib/autoconf/c.m4 b/lib/autoconf/c.m4
index 88785d1e..0fdf9dd5 100644
--- a/lib/autoconf/c.m4
+++ b/lib/autoconf/c.m4
@@ -190,7 +190,8 @@ choke me
 # errors with `-W error'.
 m4_define([AC_LANG_BOOL_COMPILE_TRY(C)],
 [AC_LANG_PROGRAM([$1], [static int test_array @<:@1 - 2 * !($2)@:>@;
-test_array @<:@0@:>@ = 0
+test_array @<:@0@:>@ = 0;
+return test_array @<:@0@:>@;
 ])])
 
 
-- 
2.47.2