| Message ID | 20190417174515.GD4324@redhat.com |
|---|---|
| State | New |
| Headers | show |
| Series | C++ PATCH for c++/90124 - bogus error with incomplete type in decltype | expand |
On Wed, Apr 17, 2019 at 10:45 AM Marek Polacek <polacek@redhat.com> wrote: > > This fixes a recent P1. Here we were giving the "invalid use of incomplete > type" error, but "the operand of the decltype specifier is an unevaluated operand" > and so the objects it names are not required to have a definition. > > Bootstrapped/regtested on x86_64-linux, ok for trunk? > > 2019-04-17 Marek Polacek <polacek@redhat.com> > > PR c++/90124 - bogus error with incomplete type in decltype. > * typeck.c (build_class_member_access_expr): Check > cp_unevaluated_operand. OK, thanks. Jason
diff --git gcc/cp/typeck.c gcc/cp/typeck.c index 03b14024738..7224d9bf9ed 100644 --- gcc/cp/typeck.c +++ gcc/cp/typeck.c @@ -2477,7 +2477,8 @@ build_class_member_access_expr (cp_expr object, tree member, /* We didn't complain above about a currently open class, but now we must: we don't know how to refer to a base member before layout is complete. But still don't complain in a template. */ - if (!dependent_type_p (object_type) + if (!cp_unevaluated_operand + && !dependent_type_p (object_type) && !complete_type_or_maybe_complain (object_type, object, complain)) return error_mark_node; diff --git gcc/testsuite/g++.dg/cpp0x/decltype70.C gcc/testsuite/g++.dg/cpp0x/decltype70.C new file mode 100644 index 00000000000..b26aca90651 --- /dev/null +++ gcc/testsuite/g++.dg/cpp0x/decltype70.C @@ -0,0 +1,10 @@ +// PR c++/90124 +// { dg-do compile { target c++11 } } + +class a { +public: + int b; +}; +class c : a { + auto m_fn1() -> decltype(b); +};