http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53780
--- Comment #8 from vincenzo Innocente <vincenzo.innocente at cern dot ch> 2012-06-29 15:03:17 UTC --- NOT when applied on the top of gcc version 4.8.0 20120629 (experimental) [trunk revision 189073] (GCC) svn diff Index: gcc/tree.c =================================================================== --- gcc/tree.c (revision 189073) +++ gcc/tree.c (working copy) @@ -4910,7 +4910,15 @@ fld_worklist_push (TYPE_MAIN_VARIANT (t), fld); /* Do not walk TYPE_NEXT_VARIANT. We do not stream it and thus do not and want not to reach unused variants this way. */ - fld_worklist_push (TYPE_CONTEXT (t), fld); + if (TYPE_CONTEXT (t)) + { + tree ctx = TYPE_CONTEXT (t); + /* We adjust BLOCK TYPE_CONTEXTs to the innermost non-BLOCK one. + So push that instead. */ + while (ctx && TREE_CODE (ctx) == BLOCK) + ctx = BLOCK_SUPERCONTEXT (ctx); + fld_worklist_push (ctx, fld); + } /* Do not walk TYPE_CANONICAL. We do not stream it and thus do not and want not to reach unused types this way. */ I'll try also with 4.7 did not manage yet to reproduce with simple examples using sigcpp...