Fix up getopt() reset management so it works on recent mingw.

The mingw people don't appear to care about compatibility with non-GNU
versions of getopt, so force use of our own copy of getopt on Windows.
Also, ensure that we make use of optreset when using our own copy.

Per report from Andrew Dunstan.  Back-patch to all versions supported
on Windows.

configure

@@ -15047,6 +15047,27 @@ case $host_os in bsdi*|netbsd*)
 ac_cv_func_fseeko=yes
 esac
 
+# mingw has adopted a GNU-centric interpretation of optind/optreset,
+# so always use our version on Windows.
+if test "$PORTNAME" = "win32"; then
+  case $LIBOBJS in
+    "getopt.$ac_objext"   | \
+  *" getopt.$ac_objext"   | \
+    "getopt.$ac_objext "* | \
+  *" getopt.$ac_objext "* ) ;;
+  *) LIBOBJS="$LIBOBJS getopt.$ac_objext" ;;
+esac
+
+  case $LIBOBJS in
+    "getopt_long.$ac_objext"   | \
+  *" getopt_long.$ac_objext"   | \
+    "getopt_long.$ac_objext "* | \
+  *" getopt_long.$ac_objext "* ) ;;
+  *) LIBOBJS="$LIBOBJS getopt_long.$ac_objext" ;;
+esac
+
+fi
+
 # Win32 support
 if test "$PORTNAME" = "win32"; then
 

configure.in

@@ -1019,6 +1019,13 @@ case $host_os in bsdi*|netbsd*)
 ac_cv_func_fseeko=yes
 esac
 
+# mingw has adopted a GNU-centric interpretation of optind/optreset,
+# so always use our version on Windows.
+if test "$PORTNAME" = "win32"; then
+  AC_LIBOBJ(getopt)
+  AC_LIBOBJ(getopt_long)
+fi
+
 # Win32 support
 if test "$PORTNAME" = "win32"; then
 AC_REPLACE_FUNCS(gettimeofday)

src/backend/postmaster/postmaster.c

@@ -232,7 +232,8 @@ extern char *optarg;
 extern int	optind,
 			opterr;
 
-#ifdef HAVE_INT_OPTRESET
+/* If not HAVE_GETOPT, we are using src/port/getopt.c, which has optreset */
+#if defined(HAVE_INT_OPTRESET) || !defined(HAVE_GETOPT)
 extern int	optreset;
 #endif
 
@@ -658,7 +659,7 @@ PostmasterMain(int argc, char *argv[])
 	 * getopt(3) library so that it will work correctly in subprocesses.
 	 */
 	optind = 1;
-#ifdef HAVE_INT_OPTRESET
+#if defined(HAVE_INT_OPTRESET) || !defined(HAVE_GETOPT)
 	optreset = 1;				/* some systems need this too */
 #endif