qom: Restrict compat properties API to system emulation

Move compat properties API definitions to their own file
unit, compile it only when system emulation is configured.
Add a pair of stubs for user emulation.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Message-Id: <20260325151728.45378-6-philmd@linaro.org>

MAINTAINERS

@@ -3533,6 +3533,7 @@ F: qapi/qom.json
 F: scripts/coccinelle/qom-parent-type.cocci
 F: scripts/qom-cast-macro-clean-cocci-gen.py
 F: qom/
+F: stubs/qom-compat-properties.c
 F: tests/unit/check-qom-interface.c
 F: tests/unit/check-qom-proplist.c
 F: tests/qtest/qom-test.c

qom/compat-properties.c

@@ -0,0 +1,76 @@
+/*
+ * QEMU Object Model
+ *
+ * Copyright IBM, Corp. 2011
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "qom/compat-properties.h"
+#include "qom/qom-qobject.h"
+#include "hw/core/qdev.h"
+
+/*
+ * Global property defaults
+ * Slot 0: accelerator's global property defaults
+ * Slot 1: machine's global property defaults
+ * Slot 2: global properties from legacy command line option
+ * Each is a GPtrArray of GlobalProperty.
+ * Applied in order, later entries override earlier ones.
+ */
+static GPtrArray *object_compat_props[3];
+
+/*
+ * Retrieve @GPtrArray for global property defined with options
+ * other than "-global".  These are generally used for syntactic
+ * sugar and legacy command line options.
+ */
+void object_register_sugar_prop(const char *driver, const char *prop,
+                                const char *value, bool optional)
+{
+    GlobalProperty *g;
+    if (!object_compat_props[2]) {
+        object_compat_props[2] = g_ptr_array_new();
+    }
+    g = g_new0(GlobalProperty, 1);
+    g->driver = g_strdup(driver);
+    g->property = g_strdup(prop);
+    g->value = g_strdup(value);
+    g->optional = optional;
+    g_ptr_array_add(object_compat_props[2], g);
+}
+
+/*
+ * Set machine's global property defaults to @compat_props.
+ * May be called at most once.
+ */
+void object_set_machine_compat_props(GPtrArray *compat_props)
+{
+    assert(!object_compat_props[1]);
+    object_compat_props[1] = compat_props;
+}
+
+/*
+ * Set accelerator's global property defaults to @compat_props.
+ * May be called at most once.
+ */
+void object_set_accelerator_compat_props(GPtrArray *compat_props)
+{
+    assert(!object_compat_props[0]);
+    object_compat_props[0] = compat_props;
+}
+
+void object_apply_compat_props(Object *obj)
+{
+    int i;
+
+    for (i = 0; i < ARRAY_SIZE(object_compat_props); i++) {
+        object_apply_global_props(obj, object_compat_props[i],
+                                  i == 2 ? &error_fatal : &error_abort);
+    }
+}

qom/meson.build

@@ -5,6 +5,9 @@ qom_ss.add(files(
   'object_interfaces.c',
   'qom-qobject.c',
 ))
+if have_system
+  qom_ss.add(files('compat-properties.c'))
+endif
 
 qmp_ss.add(files('qom-qmp-cmds.c'))
 system_ss.add(files('qom-hmp-cmds.c'))

qom/object.c

@@ -480,66 +480,6 @@ bool object_apply_global_props(Object *obj, const GPtrArray *props,
     return true;
 }
 
-/*
- * Global property defaults
- * Slot 0: accelerator's global property defaults
- * Slot 1: machine's global property defaults
- * Slot 2: global properties from legacy command line option
- * Each is a GPtrArray of GlobalProperty.
- * Applied in order, later entries override earlier ones.
- */
-static GPtrArray *object_compat_props[3];
-
-/*
- * Retrieve @GPtrArray for global property defined with options
- * other than "-global".  These are generally used for syntactic
- * sugar and legacy command line options.
- */
-void object_register_sugar_prop(const char *driver, const char *prop,
-                                const char *value, bool optional)
-{
-    GlobalProperty *g;
-    if (!object_compat_props[2]) {
-        object_compat_props[2] = g_ptr_array_new();
-    }
-    g = g_new0(GlobalProperty, 1);
-    g->driver = g_strdup(driver);
-    g->property = g_strdup(prop);
-    g->value = g_strdup(value);
-    g->optional = optional;
-    g_ptr_array_add(object_compat_props[2], g);
-}
-
-/*
- * Set machine's global property defaults to @compat_props.
- * May be called at most once.
- */
-void object_set_machine_compat_props(GPtrArray *compat_props)
-{
-    assert(!object_compat_props[1]);
-    object_compat_props[1] = compat_props;
-}
-
-/*
- * Set accelerator's global property defaults to @compat_props.
- * May be called at most once.
- */
-void object_set_accelerator_compat_props(GPtrArray *compat_props)
-{
-    assert(!object_compat_props[0]);
-    object_compat_props[0] = compat_props;
-}
-
-void object_apply_compat_props(Object *obj)
-{
-    int i;
-
-    for (i = 0; i < ARRAY_SIZE(object_compat_props); i++) {
-        object_apply_global_props(obj, object_compat_props[i],
-                                  i == 2 ? &error_fatal : &error_abort);
-    }
-}
-
 static void object_class_property_init_all(Object *obj)
 {
     ObjectPropertyIterator iter;

stubs/meson.build

@@ -54,6 +54,7 @@ if have_user
   # Symbols that are used by hw/core.
   stub_ss.add(files('cpu-synchronize-state.c'))
   stub_ss.add(files('cpu-destroy-address-spaces.c'))
+  stub_ss.add(files('qom-compat-properties.c'))
 
   # Stubs for QAPI events.  Those can always be included in the build, but
   # they are not built at all for --disable-system builds.

stubs/qom-compat-properties.c

@@ -0,0 +1,14 @@
+/*
+ * QEMU Object Model (compat properties stubs for user emulation)
+ *
+ * Copyright (c) Linaro
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "qom/compat-properties.h"
+
+void object_apply_compat_props(Object *obj)
+{
+}