Fix gnulib to not replace gmtime() and localtime()

It cause issues when <ctime> latter undefine the gmtime/localtime macros
to access the real function.

* lib/Makefile.am, lib/time.in.h, m4/gettimeofday.m4, m4/time_h.m4:
These changes are mostly based on the patch posted in
http://permalink.gmane.org/gmane.comp.lib.gnulib.bugs/29229 but
with the prototype of gmtime() and localtime() fixed.

lib/Makefile.am

@@ -1450,9 +1450,13 @@ time.h: time.in.h $(top_builddir)/config.status $(CXXDEFS_H) $(ARG_NONNULL_H) $(
 	      -e 's/@''GNULIB_TIMEGM''@/$(GNULIB_TIMEGM)/g' \
 	      -e 's/@''GNULIB_TIME_R''@/$(GNULIB_TIME_R)/g' \
 	      -e 's|@''HAVE_DECL_LOCALTIME_R''@|$(HAVE_DECL_LOCALTIME_R)|g' \
+	      -e 's|@''HAVE_LOCALTIME''@|$(HAVE_LOCALTIME)|g' \
+	      -e 's|@''HAVE_GMTIME''@|$(HAVE_GMTIME)|g' \
 	      -e 's|@''HAVE_NANOSLEEP''@|$(HAVE_NANOSLEEP)|g' \
 	      -e 's|@''HAVE_STRPTIME''@|$(HAVE_STRPTIME)|g' \
 	      -e 's|@''HAVE_TIMEGM''@|$(HAVE_TIMEGM)|g' \
+	      -e 's|@''REPLACE_GMTIME''@|$(REPLACE_GMTIME)|g' \
+	      -e 's|@''REPLACE_LOCALTIME''@|$(REPLACE_LOCALTIME)|g' \
 	      -e 's|@''REPLACE_LOCALTIME_R''@|$(REPLACE_LOCALTIME_R)|g' \
 	      -e 's|@''REPLACE_MKTIME''@|$(REPLACE_MKTIME)|g' \
 	      -e 's|@''REPLACE_NANOSLEEP''@|$(REPLACE_NANOSLEEP)|g' \

lib/time.in.h

@@ -187,6 +187,40 @@ _GL_CXXALIASWARN (gmtime_r);
 #  endif
 # endif
 
+/* Convert TIMER to RESULT, assuming local time and UTC respectively.  See
+   <http://www.opengroup.org/susv3xsh/localtime.html> and
+   <http://www.opengroup.org/susv3xsh/gmtime.html>.  */
+# if @REPLACE_LOCALTIME@
+#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
+#   undef localtime
+#   define localtime rpl_localtime
+#  endif
+_GL_FUNCDECL_RPL (localtime, struct tm *, (time_t const *__timer)
+		                          _GL_ARG_NONNULL ((1)));
+_GL_CXXALIAS_RPL (localtime, struct tm *, (time_t const *__timer));
+# else
+#  if ! @HAVE_LOCALTIME@
+_GL_FUNCDECL_SYS (localtime, struct tm *, (time_t const *__timer)
+                                          _GL_ARG_NONNULL ((1)));
+#  endif
+_GL_CXXALIAS_SYS (localtime, struct tm *, (time_t const *__timer));
+# endif
+# if @REPLACE_GMTIME@
+#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
+#   undef gmtime
+#   define gmtime rpl_gmtime
+#  endif
+_GL_FUNCDECL_RPL (gmtime, struct tm *, (time_t const *__timer)
+                                       _GL_ARG_NONNULL ((1)));
+_GL_CXXALIAS_RPL (gmtime, struct tm *, (time_t const *__timer));
+# else
+#  if ! @HAVE_GMTIME@
+_GL_FUNCDECL_SYS (gmtime, struct tm *, (time_t const *__timer)
+                                       _GL_ARG_NONNULL ((1)));
+#  endif
+_GL_CXXALIAS_SYS (gmtime, struct tm *, (time_t const *__timer));
+# endif
+
 /* Parse BUF as a time stamp, assuming FORMAT specifies its layout, and store
    the resulting broken-down time into TM.  See
    <http://www.opengroup.org/susv3xsh/strptime.html>.  */

m4/gettimeofday.m4

@@ -127,10 +127,15 @@ AC_DEFUN([gl_FUNC_GETTIMEOFDAY_CLOBBER],
 ])
 
 AC_DEFUN([gl_GETTIMEOFDAY_REPLACE_LOCALTIME], [
-  AC_DEFINE([gmtime], [rpl_gmtime],
-    [Define to rpl_gmtime if the replacement function should be used.])
-  AC_DEFINE([localtime], [rpl_localtime],
-    [Define to rpl_localtime if the replacement function should be used.])
+  AC_CHECK_FUNCS_ONCE([gmtime localtime])
+  if test $ac_cv_func_gmtime != yes; then
+    HAVE_GMTIME=0
+  fi
+  if test $ac_cv_func_localtime != yes; then
+    HAVE_LOCALTIME=0
+  fi
+  REPLACE_GMTIME=1
+  REPLACE_LOCALTIME=1
 ])
 
 # Prerequisites of lib/gettimeofday.c.

m4/time_h.m4

@@ -96,12 +96,16 @@ AC_DEFUN([gl_HEADER_TIME_H_DEFAULTS],
   GNULIB_TIME_R=0;                       AC_SUBST([GNULIB_TIME_R])
   dnl Assume proper GNU behavior unless another module says otherwise.
   HAVE_DECL_LOCALTIME_R=1;               AC_SUBST([HAVE_DECL_LOCALTIME_R])
+  HAVE_GMTIME=1;                         AC_SUBST([HAVE_GMTIME])
+  HAVE_LOCALTIME=1;                      AC_SUBST([HAVE_LOCALTIME])
   HAVE_NANOSLEEP=1;                      AC_SUBST([HAVE_NANOSLEEP])
   HAVE_STRPTIME=1;                       AC_SUBST([HAVE_STRPTIME])
   HAVE_TIMEGM=1;                         AC_SUBST([HAVE_TIMEGM])
   dnl If another module says to replace or to not replace, do that.
   dnl Otherwise, replace only if someone compiles with -DGNULIB_PORTCHECK;
   dnl this lets maintainers check for portability.
+  REPLACE_GMTIME=GNULIB_PORTCHECK;       AC_SUBST([REPLACE_GMTIME])
+  REPLACE_LOCALTIME=GNULIB_PORTCHECK;    AC_SUBST([REPLACE_LOCALTIME])
   REPLACE_LOCALTIME_R=GNULIB_PORTCHECK;  AC_SUBST([REPLACE_LOCALTIME_R])
   REPLACE_MKTIME=GNULIB_PORTCHECK;       AC_SUBST([REPLACE_MKTIME])
   REPLACE_NANOSLEEP=GNULIB_PORTCHECK;    AC_SUBST([REPLACE_NANOSLEEP])