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https://bugs.gentoo.org/576818

From 1f63650823cebf52044df840c81062ccb52163a2 Mon Sep 17 00:00:00 2001
From: Daiki Ueno <ueno@gnu.org>
Date: Mon, 28 Dec 2015 06:27:42 +0900
Subject: [PATCH] maint: fix operator precedence in mbrtowc test

This is a fix for test breakage introduced by commit 45228d96; the
equality expression must be parenthesized when negated with '!',
otherwise we always get:

  test-mbrtowc.c:49: assertion 'ret == (size_t)(-2)' failed

* m4/mbrtowc.m4 (gl_MBRTOWC_EMPTY_INPUT): Negate the entire expression.
* m4/mbrlen.m4 (gl_MBRLEN_EMPTY_INPUT): Likewise.
---
 m4/mbrlen.m4  | 2 +-
 m4/mbrtowc.m4 | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/m4/mbrtowc.m4 b/m4/mbrtowc.m4
index deb9f06..be2e9d6 100644
--- a/configure
+++ configure
@@ -569,7 +569,7 @@ changequote([,])dnl
            int
            main (void)
            {
-             return ! mbrtowc (&wc, "", 0, &mbs) == (size_t) -2;
+             return ! mbrtowc (&wc, "", 0, &mbs) == (size_t) -2;
            }
 _ACEOF
 if ac_fn_c_try_run "$LINENO"; then :
-- 
2.6.2