On Tue, Jun 12, 2012 at 10:00 PM, H.J. Lu <hjl.to...@gmail.com> wrote: > On Thu, Nov 3, 2011 at 8:50 PM, Jason Merrill <ja...@redhat.com> wrote: >> 12.2 states that a temporary bound to a reference lives as long as the >> reference itself. We have done that for reference variables, but not in >> other cases, such as aggregate initialization of a struct with reference >> members. In C++11, elements of a std::initializer_list have the same >> semantics; they live as long as the std::initializer_list. Again, we were >> implementing that for initializer_list variables but not for >> initializer_list subobjects. This patch fixes that. >> >> Furthermore, if a temporary's lifetime is extended, we need to also extend >> the lifetimes of any temporaries bound to references in its initializer, and >> so on. >> >> The patch introduces a function extend_ref_init_temps called from >> store_init_value after the call to digest_init. To expose elements of an >> initializer_list to this function, I needed to stop using >> build_aggr_init_full_exprs for aggregate initialization of arrays, and >> consequently needed to call build_vec_init from store_init_value to use one >> EH region for cleaning up the whole array rather than one per element. To >> deal with multiple extended temporaries, we need to change the cleanup >> pointer from a single tree to a VEC, and add a discriminator to the mangled >> name of reference init temporaries; this has no ABI impact, since the >> temporaries have no linkage, but I also updated the demangler accordingly. >> >> Since we now do lifetime extension in extend_ref_init_temps, we can >> drastically simplify initialize_reference and do away with >> build_init_list_var_init. >> >> Tested x86_64-pc-linux-gnu, applying to trunk. > > This caused: > > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53650 >
This also caused: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54197 -- H.J.
