[Bug lto/54795] [4.8 Regression] LTO miscompiled external array access

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54795

--- Comment #26 from H.J. Lu <hjl.tools at gmail dot com> 2012-11-26 13:29:17 UTC ---
(In reply to comment #25)
> This means that somewhere there is a cl_option definition that may prevail
> that has size 1.  lto_symtab_resolve_symbols is supposed to pick the
> largest one.  The cl_options definition that matters is in options.c,
> created
> 
> const struct cl_option cl_options[] = { ... }
> 
> maybe it's size isn't finished?

Isn't just we lost debug info on arrays. We lost debug
info on all data variables.  You can pick one and verify
it.

> Also
> 
>           || (DECL_SIZE (prevailing->symbol.decl) == DECL_SIZE (e->symbol.decl)
> 
> is fragile - use tree_int_cst_eq.  I suppose we don't have anything
> like a testcase?

I don't have a testcase, except for GCC itself.