reduce compiler warnings during configure

[Eric Blake]

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Paul's latest updates to module dependencies pulled in several .m4 files
that trigger gcc compiler warnings, breaking the configuration of m4 with
'-Werror' where it had previously been working.  Paul, Bruno, are these
okay to install?

Is bh_C_SIGNED still needed, now that we assume C89?

This does not do anything about the fact that AM_LANGINFO_CODESET (and
other gettext macros) collides with the AM_ namespace.  Libtool has
recently made the move to use its own namespace LT_, rather than
potentially conflicting with automake/autoconf by reusing AC_/AM_, while
providing backwards-compatible aliases to avoid breaking existing
configure.ac files.  It would be something to consider for the next
gettext release.

2006-08-22  Eric Blake  <address@hidden>

        * stdint_h.m4 (gl_AC_HEADER_STDINT_H): Avoid compiler warning.
        * inttypes_h.m4 (gl_AC_HEADER_INTTYPES_H): Likewise.
        * longlong.m4 (AC_TYPE_LONG_LONG_INT): Likewise.
        * codeset.m4 (AM_LANGINFO_CODESET): Likewise.
        * signed.m4 (bh_C_SIGNED): Likewise.
        * intmax_t.m4 (gt_AC_TYPE_INTMAX_T): Likewise.

- --
Life is short - so eat dessert first!

Eric Blake             address@hidden
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Index: m4/stdint_h.m4
===================================================================
RCS file: /sources/gnulib/gnulib/m4/stdint_h.m4,v
retrieving revision 1.5
diff -u -p -r1.5 stdint_h.m4
--- m4/stdint_h.m4      18 Jan 2005 13:07:56 -0000      1.5
+++ m4/stdint_h.m4      22 Aug 2006 12:14:14 -0000
@@ -1,5 +1,5 @@
-# stdint_h.m4 serial 5
-dnl Copyright (C) 1997-2004 Free Software Foundation, Inc.
+# stdint_h.m4 serial 6
+dnl Copyright (C) 1997-2004, 2006 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -15,7 +15,7 @@ AC_DEFUN([gl_AC_HEADER_STDINT_H],
   [AC_TRY_COMPILE(
     [#include <sys/types.h>
 #include <stdint.h>],
-    [uintmax_t i = (uintmax_t) -1;],
+    [uintmax_t i = (uintmax_t) -1; return !i;],
     gl_cv_header_stdint_h=yes,
     gl_cv_header_stdint_h=no)])
   if test $gl_cv_header_stdint_h = yes; then
Index: m4/inttypes_h.m4
===================================================================
RCS file: /sources/gnulib/gnulib/m4/inttypes_h.m4,v
retrieving revision 1.11
diff -u -p -r1.11 inttypes_h.m4
--- m4/inttypes_h.m4    18 Jan 2005 13:07:56 -0000      1.11
+++ m4/inttypes_h.m4    22 Aug 2006 12:14:14 -0000
@@ -1,5 +1,5 @@
-# inttypes_h.m4 serial 6
-dnl Copyright (C) 1997-2004 Free Software Foundation, Inc.
+# inttypes_h.m4 serial 7
+dnl Copyright (C) 1997-2004, 2006 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -15,7 +15,7 @@ AC_DEFUN([gl_AC_HEADER_INTTYPES_H],
   [AC_TRY_COMPILE(
     [#include <sys/types.h>
 #include <inttypes.h>],
-    [uintmax_t i = (uintmax_t) -1;],
+    [uintmax_t i = (uintmax_t) -1; return !i;],
     gl_cv_header_inttypes_h=yes,
     gl_cv_header_inttypes_h=no)])
   if test $gl_cv_header_inttypes_h = yes; then
Index: m4/longlong.m4
===================================================================
RCS file: /sources/gnulib/gnulib/m4/longlong.m4,v
retrieving revision 1.8
diff -u -p -r1.8 longlong.m4
--- m4/longlong.m4      2 Jul 2006 06:49:07 -0000       1.8
+++ m4/longlong.m4      22 Aug 2006 12:14:14 -0000
@@ -1,4 +1,4 @@
-# longlong.m4 serial 6
+# longlong.m4 serial 7
 dnl Copyright (C) 1999-2006 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -22,8 +22,8 @@ AC_DEFUN([AC_TYPE_LONG_LONG_INT],
                           ? 1 : -1)];
            int i = 63;]],
          [[long long int llmax = 9223372036854775807ll;
-           return (ll << 63 | ll >> 63 | ll < i | ll > i
-                   | llmax / ll | llmax % ll);]])],
+           return ((ll << 63) | (ll >> 63) | (ll < i) | (ll > i)
+                   | (llmax / ll) | (llmax % ll));]])],
        [ac_cv_type_long_long_int=yes],
        [ac_cv_type_long_long_int=no])])
   if test $ac_cv_type_long_long_int = yes; then
Index: m4/codeset.m4
===================================================================
RCS file: /sources/gnulib/gnulib/m4/codeset.m4,v
retrieving revision 1.7
diff -u -p -r1.7 codeset.m4
--- m4/codeset.m4       18 Jan 2005 13:07:56 -0000      1.7
+++ m4/codeset.m4       22 Aug 2006 12:14:14 -0000
@@ -1,5 +1,5 @@
-# codeset.m4 serial AM1 (gettext-0.10.40)
-dnl Copyright (C) 2000-2002 Free Software Foundation, Inc.
+# codeset.m4 serial 2
+dnl Copyright (C) 2000-2002, 2006 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -10,7 +10,7 @@ AC_DEFUN([AM_LANGINFO_CODESET],
 [
   AC_CACHE_CHECK([for nl_langinfo and CODESET], am_cv_langinfo_codeset,
     [AC_TRY_LINK([#include <langinfo.h>],
-      [char* cs = nl_langinfo(CODESET);],
+      [char* cs = nl_langinfo(CODESET); return !cs;],
       am_cv_langinfo_codeset=yes,
       am_cv_langinfo_codeset=no)
     ])
Index: m4/signed.m4
===================================================================
RCS file: /sources/gnulib/gnulib/m4/signed.m4,v
retrieving revision 1.4
diff -u -p -r1.4 signed.m4
--- m4/signed.m4        18 Jan 2005 13:07:56 -0000      1.4
+++ m4/signed.m4        22 Aug 2006 12:14:14 -0000
@@ -1,5 +1,5 @@
-# signed.m4 serial 1 (gettext-0.10.40)
-dnl Copyright (C) 2001-2002 Free Software Foundation, Inc.
+# signed.m4 serial 2
+dnl Copyright (C) 2001-2002, 2006 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -9,7 +9,8 @@ dnl From Bruno Haible.
 AC_DEFUN([bh_C_SIGNED],
 [
   AC_CACHE_CHECK([for signed], bh_cv_c_signed,
-   [AC_TRY_COMPILE(, [signed char x;], bh_cv_c_signed=yes, bh_cv_c_signed=no)])
+   [AC_TRY_COMPILE(, [signed char x = 1; return !x;],
+                   bh_cv_c_signed=yes, bh_cv_c_signed=no)])
   if test $bh_cv_c_signed = no; then
     AC_DEFINE(signed, ,
               [Define to empty if the C compiler doesn't support this 
keyword.])
Index: m4/intmax_t.m4
===================================================================
RCS file: /sources/gnulib/gnulib/m4/intmax_t.m4,v
retrieving revision 1.5
diff -u -p -r1.5 intmax_t.m4
--- m4/intmax_t.m4      18 Jan 2005 13:07:56 -0000      1.5
+++ m4/intmax_t.m4      22 Aug 2006 12:14:14 -0000
@@ -1,5 +1,5 @@
-# intmax_t.m4 serial 4
-dnl Copyright (C) 1997-2004 Free Software Foundation, Inc.
+# intmax_t.m4 serial 5
+dnl Copyright (C) 1997-2004, 2006 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -46,7 +46,7 @@ AC_DEFUN([gt_AC_TYPE_INTMAX_T],
 #if HAVE_INTTYPES_H_WITH_UINTMAX
 #include <inttypes.h>
 #endif
-], [intmax_t x = -1;], gt_cv_c_intmax_t=yes, gt_cv_c_intmax_t=no)])
+], [intmax_t x = -1; return !x;], gt_cv_c_intmax_t=yes, gt_cv_c_intmax_t=no)])
   if test $gt_cv_c_intmax_t = yes; then
     AC_DEFINE(HAVE_INTMAX_T, 1,
       [Define if you have the 'intmax_t' type in <stdint.h> or <inttypes.h>.])