I noticed that Emacs's configure script was checking for
-Wmultichar twice and tracked it down to a gnulib inefficiency,
fixed as follows.
---
ChangeLog | 7 +++++++
m4/manywarnings.m4 | 3 +--
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/ChangeLog b/ChangeLog
index 41862f2..647c832 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2012-05-27 Paul Eggert <egg...@cs.ucla.edu>
+
+ manywarnings: remove duplicate -Wmultichar entry
+ * m4/manywarnings.m4 (gl_MANYWARN_ALL_GCC): Remove duplicate
+ entry for -Wmultichar. -Wno-multichar is in the GCC 4.7.0 manual,
+ so keep the entry marked as documented.
+
2012-05-27 Karl Berry <k...@gnu.org>
* config/srclist.txt (mktime.c): remove last libc sync,
diff --git a/m4/manywarnings.m4 b/m4/manywarnings.m4
index fd0e372..864fc85 100644
--- a/m4/manywarnings.m4
+++ b/m4/manywarnings.m4
@@ -1,4 +1,4 @@
-# manywarnings.m4 serial 3
+# manywarnings.m4 serial 4
dnl Copyright (C) 2008-2012 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -143,7 +143,6 @@ AC_DEFUN([gl_MANYWARN_ALL_GCC],
for gl_manywarn_item in \
-Wattributes \
-Wcoverage-mismatch \
- -Wmultichar \
-Wunused-macros \
; do
gl_manywarn_set="$gl_manywarn_set $gl_manywarn_item"
--
1.7.6.5
