linuxonly: always define a stub function

cmd/genbindings/emitcabi.go

@@ -512,11 +512,26 @@ extern "C" {
 
 		for i, ctor := range c.Ctors {
 
-			if ctor.LinuxOnly {
-				ret.WriteString("#ifdef Q_OS_LINUX\n\n")
-			}
-
 			preamble, forwarding := emitParametersCABI2CppForwarding(ctor.Parameters)
+
+			if ctor.LinuxOnly {
+
+				ret.WriteString(fmt.Sprintf(
+					"%s* %s_new%s(%s) {\n"+
+						"#ifdef Q_OS_LINUX\n"+
+						"%s"+
+						"\treturn new %s(%s);\n"+
+						"#else\n"+
+						"\treturn nullptr;\n"+
+						"#endif\n"+
+						"}\n"+
+						"\n",
+					cClassName, cClassName, maybeSuffix(i), emitParametersCabi(ctor, ""),
+					preamble,
+					c.ClassName, forwarding,
+				))
+
+			} else {
 				ret.WriteString(fmt.Sprintf(
 					"%s* %s_new%s(%s) {\n"+
 						"%s"+
@@ -528,9 +543,8 @@ extern "C" {
 					c.ClassName, forwarding,
 				))
 
-			if ctor.LinuxOnly {
-				ret.WriteString("#endif /* Q_OS_LINUX */\n\n")
 			}
+
 		}
 
 		for _, m := range c.Methods {
@@ -667,8 +681,26 @@ extern "C" {
 			}
 
 			if m.LinuxOnly {
-				ret.WriteString("#ifdef Q_OS_LINUX\n\n")
+				ret.WriteString(fmt.Sprintf(
-			}
+					"%s %s_%s(%s) {\n"+
+						"#ifdef Q_OS_LINUX\n"+
+						"%s"+
+						"\t%s%s%s(%s);\n"+
+						"%s"+
+						"#else\n"+
+						"\t%s _ret_invalidOS;\n"+
+						"\treturn _ret_invalidOS;\n"+
+						"#endif\n"+
+						"}\n"+
+						"\n",
+					emitReturnTypeCabi(m.ReturnType), cClassName, m.SafeMethodName(), emitParametersCabi(m, cClassName+"*"),
+					preamble,
+					shouldReturn, callTarget, nativeMethodName, forwarding,
+					afterCall,
+					emitReturnTypeCabi(m.ReturnType),
+				))
+
+			} else {
 
 				ret.WriteString(fmt.Sprintf(
 					"%s %s_%s(%s) {\n"+
@@ -683,6 +715,8 @@ extern "C" {
 					afterCall,
 				))
 
+			}
+
 			if m.IsSignal && !m.HasHiddenParams {
 				exactSignal := `static_cast<void (` + c.ClassName + `::*)(` + emitParameterTypesCpp(m) + `)>(&` + c.ClassName + `::` + nativeMethodName + `)`
 
@@ -696,10 +730,6 @@ extern "C" {
 				)
 			}
 
-			if m.LinuxOnly {
-				ret.WriteString("#endif /* Q_OS_LINUX */\n\n")
-			}
-
 		}
 
 		// Delete

qt/gen_qprocess.cpp

@@ -352,14 +352,15 @@ uintptr_t QProcess_State(QProcess* self) {
 	return static_cast<uintptr_t>(ret);
 }
 
-#ifdef Q_OS_LINUX
-
 int64_t QProcess_Pid(QProcess* self) {
+#ifdef Q_OS_LINUX
 	return const_cast<const QProcess*>(self)->pid();
+#else
+	int64_t _ret_invalidOS;
+	return _ret_invalidOS;
+#endif
 }
 
-#endif /* Q_OS_LINUX */
-
 long long QProcess_ProcessId(QProcess* self) {
 	return const_cast<const QProcess*>(self)->processId();
 }

qt/gen_qsocketnotifier.cpp

@@ -108,14 +108,14 @@ QSocketDescriptor* QSocketDescriptor_new2(QSocketDescriptor* param1) {
 	return new QSocketDescriptor(*param1);
 }
 
-#ifdef Q_OS_LINUX
-
 QSocketDescriptor* QSocketDescriptor_new3(uintptr_t descriptor) {
+#ifdef Q_OS_LINUX
 	return new QSocketDescriptor(static_cast<QSocketDescriptor::DescriptorType>(descriptor));
+#else
+	return nullptr;
+#endif
 }
 
-#endif /* Q_OS_LINUX */
-
 bool QSocketDescriptor_IsValid(QSocketDescriptor* self) {
 	return const_cast<const QSocketDescriptor*>(self)->isValid();
 }