strftime: remove dependencies on multibyte modules strftime depended on mbrlen, mbsinit, and wchar, but these modules are needed only if ! MULTIBYTE_IS_FORMAT_SAFE, and that is true only if __osf__ is defined, and I suspect OSF doesn't need these other modules. If my guess is wrong, we'll need to come up with a variant of strftime that doesn't need the multibyte modules. I discovered this problem when attempting modify Emacs to use the strftime module. With the previous gnulib, this caused Emacs to need 31 new files, ranging from lib/config.charset to m4/wint_t.m4. This was overkill and I expect would be offputting to the Emacs maintainers. After this change, only 6 new files are needed, namely strftime.[ch], srtftime.m4, stdbool.in.h, stdbool.m4, and tm_gmtoff.m4. * lib/strftime.c (MULTIBYTE_IS_FORMAT_SAFE): Define to 1 always. Suggested by Bruno Haible in <http://lists.gnu.org/archive/html/bug-gnulib/2011-01/msg00238.html>. * m4/strftime.m4 (gl_FUNC_STRFTIME): Do not require AC_TYPE_MBSTATE_T, and do not check for wchar.h. * modules/strftime (Files): Remove m4/mbstate_t.m4. (Depends-on): Remove mbrlen, mbsinit, wchar.

--- a/lib/strftime.c
+++ b/lib/strftime.c
@@ -48,8 +48,11 @@
    GB18030, EUC-TW, BIG5, BIG5-HKSCS, CP950, EUC-JP, EUC-KR, CP949,
    SHIFT_JIS, CP932, JOHAB) are safe for formats, because the byte '%'
    cannot occur in a multibyte character except in the first byte.
-   But this does not hold for the DEC-HANYU encoding used on OSF/1.  */
-#if !defined __osf__
+
+   The DEC-HANYU encoding used on OSF/1 is not safe for formats, but
+   this encoding has never been seen in real-life use, so we ignore
+   it.  */
+#if !(defined __osf__ && 0)
 # define MULTIBYTE_IS_FORMAT_SAFE 1
 #endif
 #define DO_MULTIBYTE (! MULTIBYTE_IS_FORMAT_SAFE)