4.8 doesn't throw -Wreturn-type anymore for wrong returns in macros

[Lars Karlitski]

GLib has a macro g_return_if_fail(), that returns from a function when a precondition isn't met. gcc used to warn when calling it in a function that returns a value, but stopped doing so in 4.8.

$ cat return-warning.c

#include <glib.h>

int function (int c)
{
  g_return_if_fail (c > 100);
}
$ gcc-4.7 -c -Wreturn-type `pkg-config --cflags glib-2.0` return-warning.c
return-warning.c: In function ‘function’:
return-warning.c:6:3: warning: ‘return’ with no value, in function returning non-void [-Wreturn-type]
$ gcc-4.8 -c -Wreturn-type `pkg-config --cflags glib-2.0` return-warning.c
$