Assorted minor changes to silence Windows compiler warnings.

Mostly to do with macro redefinitions or object signedness.

src/backend/main/main.c

@@ -392,7 +392,7 @@ get_current_username(const char *progname)
 	/* Allocate new memory because later getpwuid() calls can overwrite it. */
 	return strdup(pw->pw_name);
 #else
-	long		namesize = 256 /* UNLEN */ + 1;
+	unsigned long	namesize = 256 /* UNLEN */ + 1;
 	char	   *name;
 
 	name = malloc(namesize);

src/backend/port/win32/socket.c

@@ -369,8 +369,18 @@ pgwin32_recv(SOCKET s, char *buf, int len, int f)
 	return -1;
 }
 
+/*
+ * The second argument to send() is defined by SUS to be a "const void *"
+ * and so we use the same signature here to keep compilers happy when
+ * handling callers.
+ * 
+ * But the buf member of a WSABUF struct is defined as "char *", so we cast
+ * the second argument to that here when assigning it, also to keep compilers
+ * happy.
+ */
+
 int
-pgwin32_send(SOCKET s, char *buf, int len, int flags)
+pgwin32_send(SOCKET s, const void *buf, int len, int flags)
 {
 	WSABUF		wbuf;
 	int			r;
@@ -380,7 +390,7 @@ pgwin32_send(SOCKET s, char *buf, int len, int flags)
 		return -1;
 
 	wbuf.len = len;
-	wbuf.buf = buf;
+	wbuf.buf = (char *) buf;
 
 	/*
 	 * Readiness of socket to send data to UDP socket may be not true: socket

src/backend/utils/adt/pg_locale.c

@@ -63,7 +63,16 @@
 #include "utils/syscache.h"
 
 #ifdef WIN32
+/*
+ * This Windows file defines StrNCpy. We don't need it here, so we undefine
+ * it to keep the compiler quiet, and undefine it again after the file is
+ * included, so we don't accidentally use theirs.
+ */
+#undef StrNCpy
 #include <shlwapi.h>
+#ifdef StrNCpy
+#undef STrNCpy
+#endif
 #endif
 
 #define		MAX_L10N_DATA		80
@@ -555,7 +564,9 @@ strftime_win32(char *dst, size_t dstlen, const wchar_t *format, const struct tm
 	dst[len] = '\0';
 	if (encoding != PG_UTF8)
 	{
-		char	   *convstr = pg_do_encoding_conversion(dst, len, PG_UTF8, encoding);
+		char	   *convstr = 
+			(char *) pg_do_encoding_conversion((unsigned char *) dst, 
+											   len, PG_UTF8, encoding);
 
 		if (dst != convstr)
 		{

src/bin/initdb/initdb.c

@@ -1561,7 +1561,7 @@ normalize_locale_name(char *new, const char *old)
 static void
 setup_collation(void)
 {
-#ifdef HAVE_LOCALE_T
+#if defined(HAVE_LOCALE_T) && !defined(WIN32)
 	int			i;
 	FILE	   *locale_a_handle;
 	char		localebuf[NAMEDATALEN];
@@ -1687,10 +1687,10 @@ setup_collation(void)
 		printf(_("No usable system locales were found.\n"));
 		printf(_("Use the option \"--debug\" to see details.\n"));
 	}
-#else							/* not HAVE_LOCALE_T */
+#else							/* not HAVE_LOCALE_T && not WIN32 */
 	printf(_("not supported on this platform\n"));
 	fflush(stdout);
-#endif   /* not HAVE_LOCALE_T */
+#endif   /* not HAVE_LOCALE_T  && not WIN32*/
 }
 
 /*
@@ -2387,7 +2387,10 @@ setlocales(void)
 #ifdef WIN32
 typedef BOOL (WINAPI * __CreateRestrictedToken) (HANDLE, DWORD, DWORD, PSID_AND_ATTRIBUTES, DWORD, PLUID_AND_ATTRIBUTES, DWORD, PSID_AND_ATTRIBUTES, PHANDLE);
 
+/* Windows API define missing from some versions of MingW headers */
+#ifndef  DISABLE_MAX_PRIVILEGE
 #define DISABLE_MAX_PRIVILEGE	0x1
+#endif
 
 /*
  * Create a restricted token and execute the specified process with it.

src/bin/pg_ctl/pg_ctl.c

@@ -1461,8 +1461,10 @@ typedef BOOL (WINAPI * __SetInformationJobObject) (HANDLE, JOBOBJECTINFOCLASS, L
 typedef BOOL (WINAPI * __AssignProcessToJobObject) (HANDLE, HANDLE);
 typedef BOOL (WINAPI * __QueryInformationJobObject) (HANDLE, JOBOBJECTINFOCLASS, LPVOID, DWORD, LPDWORD);
 
-/* Windows API define missing from MingW headers */
+/* Windows API define missing from some versions of MingW headers */
+#ifndef  DISABLE_MAX_PRIVILEGE
 #define DISABLE_MAX_PRIVILEGE	0x1
+#endif
 
 /*
  * Create a restricted token, a job object sandbox, and execute the specified

src/include/port/win32.h

@@ -336,7 +336,7 @@ SOCKET		pgwin32_accept(SOCKET s, struct sockaddr * addr, int *addrlen);
 int			pgwin32_connect(SOCKET s, const struct sockaddr * name, int namelen);
 int			pgwin32_select(int nfds, fd_set *readfs, fd_set *writefds, fd_set *exceptfds, const struct timeval * timeout);
 int			pgwin32_recv(SOCKET s, char *buf, int len, int flags);
-int			pgwin32_send(SOCKET s, char *buf, int len, int flags);
+int			pgwin32_send(SOCKET s, const void *buf, int len, int flags);
 
 const char *pgwin32_socket_strerror(int err);
 int			pgwin32_waitforsinglesocket(SOCKET s, int what, int timeout);

src/pl/plperl/plperl.c

@@ -3551,7 +3551,7 @@ hv_store_string(HV *hv, const char *key, SV *val)
 	 * does not appear that hashes track UTF-8-ness of keys at all in Perl
 	 * 5.6.
 	 */
-	hlen = -strlen(hkey);
+	hlen = - (int) strlen(hkey);
 	ret = hv_store(hv, hkey, hlen, val, 0);
 
 	if (hkey != key)
@@ -3576,7 +3576,7 @@ hv_fetch_string(HV *hv, const char *key)
 								  GetDatabaseEncoding(), PG_UTF8);
 
 	/* See notes in hv_store_string */
-	hlen = -strlen(hkey);
+	hlen = - (int) strlen(hkey);
 	ret = hv_fetch(hv, hkey, hlen, 0);
 
 	if (hkey != key)

src/port/noblock.c

@@ -23,7 +23,7 @@ pg_set_noblock(pgsocket sock)
 #if !defined(WIN32)
 	return (fcntl(sock, F_SETFL, O_NONBLOCK) != -1);
 #else
-	long		ioctlsocket_ret = 1;
+	unsigned long		ioctlsocket_ret = 1;
 
 	/* Returns non-0 on failure, while fcntl() returns -1 on failure */
 	return (ioctlsocket(sock, FIONBIO, &ioctlsocket_ret) == 0);
@@ -42,7 +42,7 @@ pg_set_block(pgsocket sock)
 		return false;
 	return true;
 #else
-	long		ioctlsocket_ret = 0;
+	unsigned long		ioctlsocket_ret = 0;
 
 	/* Returns non-0 on failure, while fcntl() returns -1 on failure */
 	return (ioctlsocket(sock, FIONBIO, &ioctlsocket_ret) == 0);

src/test/regress/pg_regress.c

@@ -140,9 +140,11 @@ __attribute__((format(printf, 2, 3)));
 #ifdef WIN32
 typedef BOOL (WINAPI * __CreateRestrictedToken) (HANDLE, DWORD, DWORD, PSID_AND_ATTRIBUTES, DWORD, PLUID_AND_ATTRIBUTES, DWORD, PSID_AND_ATTRIBUTES, PHANDLE);
 
-/* Windows API define missing from MingW headers */
+/* Windows API define missing from some versions of MingW headers */
+#ifndef  DISABLE_MAX_PRIVILEGE
 #define DISABLE_MAX_PRIVILEGE	0x1
 #endif
+#endif
 
 /*
  * allow core files if possible.

src/timezone/pgtz.c

@@ -1158,7 +1158,7 @@ identify_system_timezone(void)
 
 		memset(zonename, 0, sizeof(zonename));
 		namesize = sizeof(zonename);
-		if ((r = RegQueryValueEx(key, "Std", NULL, NULL, zonename, &namesize)) != ERROR_SUCCESS)
+		if ((r = RegQueryValueEx(key, "Std", NULL, NULL, (unsigned char *) zonename, &namesize)) != ERROR_SUCCESS)
 		{
 			ereport(LOG,
 					(errmsg_internal("could not query value for key \"std\" to identify system time zone \"%s\": %i",
@@ -1175,7 +1175,7 @@ identify_system_timezone(void)
 		}
 		memset(zonename, 0, sizeof(zonename));
 		namesize = sizeof(zonename);
-		if ((r = RegQueryValueEx(key, "Dlt", NULL, NULL, zonename, &namesize)) != ERROR_SUCCESS)
+		if ((r = RegQueryValueEx(key, "Dlt", NULL, NULL, (unsigned char *) zonename, &namesize)) != ERROR_SUCCESS)
 		{
 			ereport(LOG,
 					(errmsg_internal("could not query value for key \"dlt\" to identify system time zone \"%s\": %i",