Description of problem:
In 0.18, gettext switched from using grep to using autom4te to probe the values of certain macros in configure.ac.  However, the conversion is flawed, and can lead to an attempt to run 'autopoint' or 'gettextize' invoking an m4 process with an infinite memory expansion on some configure.ac.  In particular, this was reported on the debian list when trying to build util-linux 2.20.1:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=764580

Version-Release number of selected component (if applicable):
gettext-devel-0.18.3.2-1.fc20.x86_64

How reproducible:
100%

Steps to Reproduce:
1. git clone git://git.debian.org/git/collab-maint/pkg-util-linux.git util-linux
2. cd util-linux
3. git checkout v2.20.1
4. autopoint --force

Actual results:
m4 becomes a memory hog

Expected results:
the operation completes quickly

Additional info:
patch proposed:

diff --git i/gettext-tools/misc/autopoint.in
w/gettext-tools/misc/autopoint.in
index c31943f..87ee374 100644
--- i/gettext-tools/misc/autopoint.in
+++ w/gettext-tools/misc/autopoint.in
@@ -1,6 +1,6 @@
 #! /bin/sh
 #
-# Copyright (C) 2002-2013 Free Software Foundation, Inc.
+# Copyright (C) 2002-2014 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -143,14 +143,14 @@ fi
 func_trace_autoconf ()
 {
   echo '\
-dnl disable macros which may abort autom4te
-m4_undefine([m4_assert])
-m4_undefine([m4_fatal])
-m4_undefine([m4_warn])
-m4_undefine([m4_errprintn])
-m4_undefine([m4_exit])
-m4_undefine([m4_include])
-m4_undefine([m4_esyscmd])
+dnl replace macros which may abort autom4te with a no-op variant
+m4_pushdef([m4_assert])
+m4_pushdef([m4_fatal])
+m4_pushdef([m4_warn])
+m4_pushdef([m4_errprintn])
+m4_pushdef([m4_exit])
+m4_pushdef([m4_include])
+m4_pushdef([m4_esyscmd])
 ' \
   | "$AUTOM4TE" --no-cache --language=Autoconf-without-aclocal-m4 \
     --trace="$1":\$% - "$2" 2>/dev/null
diff --git i/gettext-tools/misc/gettextize.in
w/gettext-tools/misc/gettextize.in
index dbe4d1e..33299b9 100644
--- i/gettext-tools/misc/gettextize.in
+++ w/gettext-tools/misc/gettextize.in
@@ -1,6 +1,6 @@
 #! /bin/sh
 #
-# Copyright (C) 1995-1998, 2000-2013 Free Software Foundation, Inc.
+# Copyright (C) 1995-1998, 2000-2014 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -143,14 +143,14 @@ fi
 func_trace_autoconf ()
 {
   echo '\
-dnl disable macros which may abort autom4te
-m4_undefine([m4_assert])
-m4_undefine([m4_fatal])
-m4_undefine([m4_warn])
-m4_undefine([m4_errprintn])
-m4_undefine([m4_exit])
-m4_undefine([m4_include])
-m4_undefine([m4_esyscmd])
+dnl replace macros which may abort autom4te with a no-op variant
+m4_pushdef([m4_assert])
+m4_pushdef([m4_fatal])
+m4_pushdef([m4_warn])
+m4_pushdef([m4_errprintn])
+m4_pushdef([m4_exit])
+m4_pushdef([m4_include])
+m4_pushdef([m4_esyscmd])
 ' \
   | "$AUTOM4TE" --no-cache --language=Autoconf-without-aclocal-m4 \
     --trace="$1":\$% - "$2" 2>/dev/null