GCC 3.0 considered harmful (kernel Click)

[Eddie Kohler]

All,

DO NOT use Linux-kernel Click with GCC 3.0 or later. (The default GCC
shipped with Red Hat 8 is 3.2.) An incompatibility between the C and C++
compilers will cause havoc.

The particular problem is this:

	struct empty { };
	printf("%d\n", sizeof(struct empty));

prints 0 under C, and 1 under C++. This causes Click to get kernel
structure layouts wrong, particularly if SMP is not defined.

The GCC compiler people know about this issue:
http://gcc.gnu.org/ml/gcc/2002-09/msg01109.html

>:(

Eddie