[gtk/wip/baedert/test-cflags: 2/3] examples: Add common_cflags to build

[Timm Bäder <baedert src gnome org>]

commit 0e8850bf84cfa174ba85a6d8468c5f7056aeca46
Author: Timm Bäder <mail baedert org>
Date:   Fri Mar 6 16:36:42 2020 +0100

    examples: Add common_cflags to build
    
    And fix all the warnings and errors generated by doing so.
    
    See #2491

 examples/meson.build | 2 +-
 examples/plugman.c   | 7 ++++---
 examples/sunny.c     | 3 ++-
 3 files changed, 7 insertions(+), 5 deletions(-)
---
diff --git a/examples/meson.build b/examples/meson.build
index b5c28634ea..8fcc04d547 100644
--- a/examples/meson.build
+++ b/examples/meson.build
@@ -17,7 +17,7 @@ foreach ex : examples
                '-DGDK_DISABLE_DEPRECATED',
                '-DGTK_DISABLE_DEPRECATED',
                '-DGTK_SRCDIR="@0@"'.format(meson.current_source_dir()),
-             ],
+             ] + common_cflags,
              dependencies: libgtk_dep)
 endforeach
 
diff --git a/examples/plugman.c b/examples/plugman.c
index 67d7960c5d..d36b28bfb1 100644
--- a/examples/plugman.c
+++ b/examples/plugman.c
@@ -135,6 +135,7 @@ plug_man_open (GApplication  *application,
 typedef GtkApplication PlugMan;
 typedef GtkApplicationClass PlugManClass;
 
+static GType plug_man_get_type (void);
 G_DEFINE_TYPE (PlugMan, plug_man, GTK_TYPE_APPLICATION)
 
 static void
@@ -376,10 +377,10 @@ configure_plugins (GSimpleAction *action,
   dialog = (GtkWidget *)gtk_builder_get_object (builder, "plugin-dialog");
   check = (GtkWidget *)gtk_builder_get_object (builder, "red-plugin");
   gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (check), plugin_enabled ("red"));
-  g_signal_connect (check, "toggled", G_CALLBACK (enable_or_disable_plugin), "red");
+  g_signal_connect (check, "toggled", G_CALLBACK (enable_or_disable_plugin), (char *) "red");
   check = (GtkWidget *)gtk_builder_get_object (builder, "black-plugin");
   gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (check), plugin_enabled ("black"));
-  g_signal_connect (check, "toggled", G_CALLBACK (enable_or_disable_plugin), "black");
+  g_signal_connect (check, "toggled", G_CALLBACK (enable_or_disable_plugin), (char *) "black");
 
   g_signal_connect (dialog, "response", G_CALLBACK (gtk_widget_destroy), NULL);
 
@@ -481,7 +482,7 @@ plug_man_class_init (PlugManClass *class)
 
 }
 
-PlugMan *
+static PlugMan *
 plug_man_new (void)
 {
   return g_object_new (plug_man_get_type (),
diff --git a/examples/sunny.c b/examples/sunny.c
index e57e9edd80..3e3fc6a672 100644
--- a/examples/sunny.c
+++ b/examples/sunny.c
@@ -70,6 +70,7 @@ open (GApplication  *application,
 typedef GtkApplication MenuButton;
 typedef GtkApplicationClass MenuButtonClass;
 
+static GType menu_button_get_type (void);
 G_DEFINE_TYPE (MenuButton, menu_button, GTK_TYPE_APPLICATION)
 
 static void
@@ -176,7 +177,7 @@ menu_button_class_init (MenuButtonClass *class)
   application_class->open = open;
 }
 
-MenuButton *
+static MenuButton *
 menu_button_new (void)
 {
   return g_object_new (menu_button_get_type (),