On Sun, Jun 26, 2011 at 2:45 PM, Jason Merrill <ja...@redhat.com> wrote: > On 06/26/2011 04:06 PM, H.J. Lu wrote: >> >> I added a short paragraph in the updated patch: >> >> +@defmac UNIQUE_UNWIND_CONTEXT >> + >> +Define this macro if the target only supports single unqiue unwind >> +context. The default is to support multiple unwind contexts. > > I saw that. I don't know what it means. >
The current unwind library scheme provides only one unwind context and is backward compatible with multiple different unwind contexts from multiple unwind libraries: http://gcc.gnu.org/ml/gcc-patches/2006-12/msg01769.html My patch fixes UNITS_PER_WORD > sizeof (void *) and enforces single unwind context when backward compatibility isn't needed. -- H.J.
