OK.
On Tue, May 29, 2018 at 10:55 AM, Jakub Jelinek <ja...@redhat.com> wrote: > On Tue, May 29, 2018 at 10:49:03AM -0400, Jason Merrill wrote: >> >> auto & [x,y] = a; >> >> >> >> but that should be added to the testcase. >> > >> > It is already there (in baz). >> >> Well, yes, but in baz a is an S, not an array; I see value and >> reference cases for S, but only value for int array. > > Oops, yes, you're right. Added qux then that tests array initializer > and & qualifier. > > Ok with that change? > > 2018-05-29 Jakub Jelinek <ja...@redhat.com> > > PR c++/85952 > * init.c (build_aggr_init): For structured binding initialized from > array call mark_rvalue_use on the initializer. > > * g++.dg/warn/Wunused-var-33.C: New test. > > --- gcc/cp/init.c.jj 2018-05-25 14:34:41.000000000 +0200 > +++ gcc/cp/init.c 2018-05-28 19:04:10.504063972 +0200 > @@ -1678,6 +1678,7 @@ build_aggr_init (tree exp, tree init, in > if (VAR_P (exp) && DECL_DECOMPOSITION_P (exp)) > { > from_array = 1; > + init = mark_rvalue_use (init); > if (init && DECL_P (init) > && !(flags & LOOKUP_ONLYCONVERTING)) > { > --- gcc/testsuite/g++.dg/warn/Wunused-var-33.C.jj 2018-05-28 > 19:32:00.236440573 +0200 > +++ gcc/testsuite/g++.dg/warn/Wunused-var-33.C 2018-05-29 16:52:21.322700629 > +0200 > @@ -0,0 +1,37 @@ > +// PR c++/85952 > +// { dg-do compile { target c++11 } } > +// { dg-options "-Wunused-but-set-variable" } > + > +int > +foo () > +{ > + int a[2] = {1, 2}; // { dg-bogus "set but not used" } */ > + auto [x, y] = a; // { dg-warning "structured bindings only available > with" "" { target c++14_down } } > + return x + y; > +} > + > +struct S { int d, e; }; > + > +int > +bar () > +{ > + S a = {1, 2}; > + auto [x, y] = a; // { dg-warning "structured bindings only available > with" "" { target c++14_down } } > + return x + y; > +} > + > +int > +baz () > +{ > + S a = {1, 2}; > + auto & [x, y] = a; // { dg-warning "structured bindings only available > with" "" { target c++14_down } } > + return x + y; > +} > + > +int > +qux () > +{ > + int a[2] = {1, 2}; > + auto & [x, y] = a; // { dg-warning "structured bindings only available > with" "" { target c++14_down } } > + return x + y; > +} > > Jakub