Merge branch 'clang-format-nonliteral' into 'master'

Silence clang errors about -Wformat-nonliteral due to missing intermediate attributes

See merge request GNOME/glib!1440

gio/gregistrysettingsbackend.c

@@ -201,7 +201,7 @@ trace (const char *format,
  * equivalent function for g_warning because none of the registry errors can
  * result from programmer error (Microsoft programmers don't count), instead
  * they will mostly occur from people messing with the registry by hand. */
-static void
+static void G_GNUC_PRINTF (2, 3)
 g_message_win32_error (DWORD        result_code,
                        const gchar *format,
                       ...)
@@ -312,7 +312,7 @@ handle_read_error (LONG         result,
 {
   /* file not found means key value not set, this isn't an error for us. */
   if (result != ERROR_FILE_NOT_FOUND)
-    g_message_win32_error (result, "Unable to query value %s/%s: %s.\n",
+    g_message_win32_error (result, "Unable to query value %s/%s",
                            path_name, value_name);
 }
 

gmodule/gmodule-win32.c

@@ -39,7 +39,7 @@
 #include <sys/cygwin.h>
 #endif
 
-static void
+static void G_GNUC_PRINTF (1, 2)
 set_error (const gchar *format,
 	   ...)
 {

meson.build

@@ -396,6 +396,8 @@ if cc.get_id() == 'gcc' or cc.get_id() == 'clang'
     # Due to function casts through (void*) we cannot support -Wpedantic:
     # https://wiki.gnome.org/Projects/GLib/CompilerRequirements#Function_pointer_conversions.
     '-Wno-pedantic',
+    # A zero-length format string shouldn't be considered an issue.
+    '-Wno-format-zero-length',
     '-Werror=declaration-after-statement',
     '-Werror=format=2',
     '-Werror=implicit-function-declaration',