2009-10-05  Richard Guenther  <rguenther@suse.de>

	PR lto/40902
	* lto-symtab.c (lto_compatible_attributes_p): Remove.
	(external_aggregate_decl_p): Likewise.
	(lto_symtab_compatible): Re-structure.  Remove dead code.
	For variables ignore toplevel qualifiers when comparing types.
	Issue warnings, not errors for mismatched user-alignment.

	* gcc.dg/lto/20091005-1_0.c: New testcase.
	* gcc.dg/lto/20091005-1_1.c: Likewise.

From-SVN: r152452