Properly quote AC_CHECK_DECLS' 4th argument. * m4/c-stack.m4 (gl_PREREQ_C_STACK): Double-quote AC_CHECK_DECLS' 4th argument. * m4/ceilf.m4 (gl_FUNC_CEILF): Likewise. * m4/ceill.m4 (gl_FUNC_CEILL): Likewise. * m4/dirfd.m4 (gl_FUNC_DIRFD): Likewise. * m4/floorf.m4 (gl_FUNC_FLOORF): Likewise. * m4/floorl.m4 (gl_FUNC_FLOORL): Likewise. * m4/fnmatch.m4 (gl_PREREQ_FNMATCH): Likewise. * m4/getaddrinfo.m4 (gl_PREREQ_GETADDRINFO): Likewise. * m4/getdomainname.m4 (gl_FUNC_GETDOMAINNAME): Likewise. * m4/gethrxtime.m4 (gl_GETHRXTIME): Likewise. * m4/getpass.m4 (gl_PREREQ_GETPASS): Likewise. * m4/inet_ntop.m4 (gl_FUNC_INET_NTOP): Likewise. * m4/inet_pton.m4 (gl_FUNC_INET_PTON): Likewise. * m4/isfinite.m4 (gl_ISFINITE): Likewise. * m4/isinf.m4 (gl_ISINF): Likewise. * m4/logb.m4 (gl_FUNC_LOGB): Likewise. * m4/readutmp.m4 (gl_READUTMP): Likewise. * m4/regex.m4 (gl_PREREQ_REGEX): Likewise. * m4/round.m4 (gl_FUNC_ROUND): Likewise. * m4/roundf.m4 (gl_FUNC_ROUNDF): Likewise. * m4/roundl.m4 (gl_FUNC_ROUNDL): Likewise. * m4/signbit.m4 (gl_SIGNBIT): Likewise. * m4/sleep.m4 (gl_FUNC_SLEEP): Likewise. * m4/strsignal.m4 (gl_PREREQ_STRSIGNAL): Likewise. * m4/trunc.m4 (gl_FUNC_TRUNC): Likewise. * m4/truncf.m4 (gl_FUNC_TRUNCF): Likewise. * m4/truncl.m4 (gl_FUNC_TRUNCL): Likewise. * m4/vasnprintf.m4 (gl_PREREQ_VASNPRINTF): Likewise. * m4/wctob.m4 (gl_FUNC_WCTOB): Likewise. * m4/wcwidth.m4 (gl_FUNC_WCWIDTH): Likewise. Reported by Eric Blake.

--- a/m4/truncf.m4
+++ b/m4/truncf.m4
@@ -1,4 +1,4 @@
-# truncf.m4 serial 6
+# truncf.m4 serial 8
 dnl Copyright (C) 2007, 2010-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -11,7 +11,7 @@
   dnl Persuade glibc <math.h> to declare truncf().
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
   dnl Test whether truncf() is declared.
-  AC_CHECK_DECLS([truncf], , , [#include <math.h>])
+  AC_CHECK_DECLS([truncf], , , [[#include <math.h>]])
   if test "$ac_cv_have_decl_truncf" = yes; then
     dnl Test whether truncf() can be used without libm.
     TRUNCF_LIBM=?