--- Comment #4 from ebotcazou at gcc dot gnu dot org 2009-07-04 13:52
---
> If "-mno-faster-structs" is the default, then surely it shouldn't be
> generating ldd/std in this case (and assuming the 8-byte alignment for
> "union myblock").
No, -mno-faster-structs doesn't modify the ABI.
--- Comment #3 from dentongosnell at yahoo dot com 2009-07-04 13:32 ---
(In reply to comment #2)
>
> > One other thing, there is a flag "-mno-faster-structs" which this page
> > suggests would prevent this sort of ldd/std use
> > (http://gcc.gnu.org/onlinedocs/gcc/SPARC-Options.html).
--- Comment #2 from ebotcazou at gcc dot gnu dot org 2009-07-04 06:43
---
> I think the compiler is assuming "union myblock" has the same
> alignment as "struct b_one", which is more strictly aligned than
> "struct b_two" because of its double member.
That's right and it's prescribed b
--- Comment #1 from pinskia at gmail dot com 2009-07-04 01:38 ---
Subject: Re: New: Bus error caused by ldd/std instructions in struct copy.
This code is undefined because of alignment requirments differences
for the structs and the union.
Sent from my iPhone
On Jul 3, 2009, at 6:
