Add G_GNUC_DEPRECATED_FOR macro

It would be good, error reporting-wise, to be able to signal which
function should be used instead of a deprecated one. GCC 4.5 added an
optional "message" payload to the deprecated attribute, so that:

  void f1 (void) __attribute__((deprecated("Use f2 instead")));

Will expand to:

  warning: f1 is deprecated: Use f2 instead

Instead of just printing:

  warning: f1 is deprecated

Since we already have a G_GNUC_DEPRECATED macro we should provide a
G_GNUC_DEPRECATED_FOR macro defined as:

  G_GNUC_DEPRECATED_FOR(bar)

Which would expand the deprecation message to "Use bar instead"
automatically. The deprecation message should probably be similar
to what we use in gtk-doc to match up with the documentation.

https://bugzilla.gnome.org/show_bug.cgi?id=614965

diff --git a/glib/gmacros.h b/glib/gmacros.h
index b3ff7ee..9f9c25d 100644 (file)
--- a/glib/gmacros.h
+++ b/glib/gmacros.h
@@ -107,6 +107,13 @@
 #define G_GNUC_DEPRECATED
 #endif /* __GNUC__ */
 
+#if    __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
+#define G_GNUC_DEPRECATED_FOR(f)                        \
+  __attribute__((deprecated("Use " #f " instead")))
+#else
+#define G_GNUC_DEPRECATED_FOR(f)        G_GNUC_DEPRECATED
+#endif /* __GNUC__ */
+
 #if     __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 3)
 #  define G_GNUC_MAY_ALIAS __attribute__((may_alias))
 #else