Only use open macro on GCC.

Author: Maxwell175

Include/np_embed.h

@@ -338,6 +338,7 @@ NP_DECL(int) np_ftrylockfile(void *e);
 
 #if !defined(NUITKAPYTHON_EMBED_BUILD) && !defined(NP_STDIO_ALREADY_LOADED)
 
+#ifdef __GNUC__
 #define CAT(a, ...) PRIMITIVE_CAT(a, __VA_ARGS__)
 #define PRIMITIVE_CAT(a, ...) a ## __VA_ARGS__
 
@@ -419,7 +420,7 @@ NP_DECL(int) np_ftrylockfile(void *e);
 #define NUM_ARGS1(_20,_19,_18,_17,_16,_15,_14,_13,_12,_11,_10,_9,_8,_7,_6,_5,_4,_3,_2,_1, n, ...) n
 #define NUM_ARGS0(...) NUM_ARGS1(__VA_ARGS__,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0)
 #define NUM_ARGS(...) IF(DEC(NUM_ARGS0(__VA_ARGS__)))(NUM_ARGS0(__VA_ARGS__),IF(IS_PAREN(__VA_ARGS__ ()))(0,1))
-
+#endif  // __GNUC__
 
 // Preprocessor Translation
 #define FILE EFILE
@@ -429,7 +430,7 @@ NP_DECL(int) np_ftrylockfile(void *e);
 extern EFILE *stdin;		/* Standard input stream.  */
 extern EFILE *stdout;		/* Standard output stream.  */
 extern EFILE *stderr;		/* Standard error output stream.  */
-#endif
+#endif  // __linux
 
 /* File Opening and Closing */
 ALWAYS_INLINE NP_DECL(EFILE*) fopen(const char* file, const char* mode) {
@@ -439,33 +440,18 @@ ALWAYS_INLINE NP_DECL(EFILE*) _fopen(const char* file, const char* mode) {
     return np_fopen(file, mode);
 }
 
-#ifdef _WIN32
-#ifdef __cplusplus
-ALWAYS_INLINE NP_DECL(int) open(const char *pathname, int flags, int mode = 0) {
-#else
-ALWAYS_INLINE NP_DECL(int) open(const char *pathname, int flags, int mode) {
-#endif
-#else
+#ifdef __GNUC__
 #ifdef __cplusplus
 ALWAYS_INLINE NP_DECL(int) open(const char *pathname, int flags, mode_t mode = 0) {
 #else
 ALWAYS_INLINE NP_DECL(int) open(const char *pathname, int flags, mode_t mode) {
-#endif
 #endif
     return np_open(pathname, flags, mode);
 }
-#ifdef _WIN32
-#ifdef __cplusplus
-ALWAYS_INLINE NP_DECL(int) _open(const char *pathname, int flags, int mode = 0) {
-#else
-ALWAYS_INLINE NP_DECL(int) _open(const char *pathname, int flags, int mode) {
-#endif
-#else
 #ifdef __cplusplus
 ALWAYS_INLINE NP_DECL(int) _open(const char *pathname, int flags, mode_t mode = 0) {
 #else
 ALWAYS_INLINE NP_DECL(int) _open(const char *pathname, int flags, mode_t mode) {
-#endif
 #endif
   return np_open(pathname, flags, mode);
 }
@@ -482,7 +468,29 @@ ALWAYS_INLINE NP_DECL(int) _open(const char *pathname, int flags, mode_t mode) {
 #define open7(a, b, c, d, e, f, g) open(a, b, c, d, e, f, g)
 #define open(...) CAT( open, NUM_ARGS( __VA_ARGS__ ) )( __VA_ARGS__ )
 #define _open(...) CAT( open, NUM_ARGS( __VA_ARGS__ ) )( __VA_ARGS__ )
-#endif
+#endif  // !__cplusplus
+#else  // __GNUC__
+ALWAYS_INLINE NP_DECL(int) open(const char *pathname, int flags, ... /* mode_t mode */ ) {
+    va_list args;
+    va_start(args, flags);
+    mode_t mode = 0;
+    if (flags & O_CREAT) {
+        mode = va_arg(args, int);
+    }
+    va_end(args);
+    return np_open(pathname, flags, mode);
+}
+ALWAYS_INLINE NP_DECL(int) _open(const char *pathname, int flags, ... /* mode_t mode */ ) {
+    va_list args;
+    va_start(args, flags);
+    mode_t mode = 0;
+    if (flags & O_CREAT) {
+        mode = va_arg(args, int);
+    }
+    va_end(args);
+    return np_open(pathname, flags, mode);
+}
+#endif  // !__GNUC__
 
 ALWAYS_INLINE NP_DECL(EFILE*) fdopen(int fd, const char *mode) {
   return np_fdopen(fd, mode);
@@ -546,7 +554,7 @@ ALWAYS_INLINE NP_DECL(EFILE*) wfopen(const wchar_t* file, const wchar_t* mode) {
 ALWAYS_INLINE NP_DECL(EFILE*) _wfopen(const wchar_t* file, const wchar_t* mode) {
     return np_wfopen(file, mode);
 }
-#endif
+#endif  // _WIN32
 
 ALWAYS_INLINE NP_DECL(EFILE*) tmpfile() {
   return np_tmpfile();