Pick up WinMain with proper CC

Author: LemonBoy

src/analyze.cpp

@@ -3358,8 +3358,25 @@ static void resolve_decl_fn(CodeGen *g, TldFn *tld_fn) {
         }
 
         if (fn_proto->is_export) {
-            bool ccc = (fn_proto->cc == CallingConventionUnspecified || fn_proto->cc == CallingConventionC);
-            add_fn_export(g, fn_table_entry, buf_ptr(&fn_table_entry->symbol_name), GlobalLinkageIdStrong, ccc);
+            bool ccc = false;
+
+            switch (fn_proto->cc) {
+                case CallingConventionC:
+                case CallingConventionCold:
+                case CallingConventionNaked:
+                case CallingConventionStdcall:
+                // Unspecified means no convention is explicitly given, we
+                // default to C
+                case CallingConventionUnspecified:
+                    ccc = true;
+                    break;
+                case CallingConventionAsync:
+                    ccc = false;
+                    break;
+            }
+
+            add_fn_export(g, fn_table_entry, buf_ptr(&fn_table_entry->symbol_name),
+                          GlobalLinkageIdStrong, ccc);
         }
 
         if (!is_extern) {