Win32: MinGW GCC compatibility.

Several warnings silenced, notably (ngx_socket_t) -1 is now checked
on socket operations instead of -1, as ngx_socket_t is unsigned on win32
and gcc complains on comparison.

With this patch, it's now possible to compile nginx using mingw gcc,
with options we normally compile on win32.

5 files changed, 14 insertions, 6 deletions

diff --git a/src/os/win32/ngx_atomic.h b/src/os/win32/ngx_atomic.h
index 78d7424f5..d89a0d3ca 100644
--- a/src/os/win32/ngx_atomic.h
+++ b/src/os/win32/ngx_atomic.h
@@ -21,7 +21,8 @@ typedef volatile ngx_atomic_uint_t  ngx_atomic_t;
 #define NGX_ATOMIC_T_LEN            (sizeof("-2147483648") - 1)
 
 
-#if defined( __WATCOMC__ ) || defined( __BORLANDC__ ) || ( _MSC_VER >= 1300 )
+#if defined( __WATCOMC__ ) || defined( __BORLANDC__ ) || defined(__GNUC__)    \
+    || ( _MSC_VER >= 1300 )
 
 /* the new SDK headers */
 
diff --git a/src/os/win32/ngx_process_cycle.c b/src/os/win32/ngx_process_cycle.c
index 3a14aad69..949ea85db 100644
--- a/src/os/win32/ngx_process_cycle.c
+++ b/src/os/win32/ngx_process_cycle.c
@@ -815,7 +815,7 @@ ngx_worker_thread(void *data)
 
                 /* THREAD: lock */
 
-                if (c[i].fd != -1 && c[i].idle) {
+                if (c[i].fd != (ngx_socket_t) -1 && c[i].idle) {
                     c[i].close = 1;
                     c[i].read->handler(c[i].read);
                 }
@@ -874,7 +874,7 @@ ngx_worker_process_exit(ngx_cycle_t *cycle)
     if (ngx_exiting) {
         c = cycle->connections;
         for (i = 0; i < cycle->connection_n; i++) {
-            if (c[i].fd != -1
+            if (c[i].fd != (ngx_socket_t) -1
                 && c[i].read
                 && !c[i].read->accept
                 && !c[i].read->channel
diff --git a/src/os/win32/ngx_win32_config.h b/src/os/win32/ngx_win32_config.h
index 193079230..67105f1af 100644
--- a/src/os/win32/ngx_win32_config.h
+++ b/src/os/win32/ngx_win32_config.h
@@ -9,6 +9,7 @@
 #define _NGX_WIN32_CONFIG_H_INCLUDED_
 
 
+#undef  WIN32
 #define WIN32         0x0400
 #define _WIN32_WINNT  0x0501
 
@@ -35,6 +36,12 @@
 #include <mswsock.h>
 #include <shellapi.h>
 #include <stddef.h>    /* offsetof() */
+
+#ifdef __GNUC__
+/* GCC MinGW's stdio.h includes sys/types.h */
+#define _OFF_T_
+#endif
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>
diff --git a/src/os/win32/ngx_win32_init.c b/src/os/win32/ngx_win32_init.c
index cf73d8215..d2505ced4 100644
--- a/src/os/win32/ngx_win32_init.c
+++ b/src/os/win32/ngx_win32_init.c
@@ -141,7 +141,7 @@ ngx_os_init(ngx_log_t *log)
      */
 
     s = ngx_socket(AF_INET, SOCK_STREAM, IPPROTO_IP);
-    if (s == -1) {
+    if (s == (ngx_socket_t) -1) {
         ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                       ngx_socket_n " falied");
         return NGX_ERROR;
diff --git a/src/os/win32/ngx_wsarecv.c b/src/os/win32/ngx_wsarecv.c
index dd74ae2cc..1925f0b17 100644
--- a/src/os/win32/ngx_wsarecv.c
+++ b/src/os/win32/ngx_wsarecv.c
@@ -17,7 +17,7 @@ ngx_wsarecv(ngx_connection_t *c, u_char *buf, size_t size)
     u_long        bytes, flags;
     WSABUF        wsabuf[1];
     ngx_err_t     err;
-    ngx_uint_t    n;
+    ngx_int_t     n;
     ngx_event_t  *rev;
 
     wsabuf[0].buf = (char *) buf;
@@ -70,7 +70,7 @@ ngx_overlapped_wsarecv(ngx_connection_t *c, u_char *buf, size_t size)
     u_long            bytes, flags;
     WSABUF            wsabuf[1];
     ngx_err_t         err;
-    ngx_uint_t        n;
+    ngx_int_t         n;
     ngx_event_t      *rev;
     LPWSAOVERLAPPED   ovlp;