| Message ID | CAFk2RUY6vasM8j2PYwbs1bbWOE_cG72X3pjmySF53Wy4vNiWwg@mail.gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | [C++] PR c++/87093 | expand |
OK for trunk and branches. On Sun, Sep 9, 2018 at 11:02 PM, Ville Voutilainen <ville.voutilainen@gmail.com> wrote: > Tested manually on Linux-x64, running full suite on Linux-PPC64. This > seems half-obvious. OK for trunk? Backports? > > 2018-09-10 Ville Voutilainen <ville.voutilainen@gmail.com> > > gcc/cp > > PR c++/87093 > * method.c (constructible_expr): We're in an unevaluated context > in all cases, not just for class targets. > > testsuite/ > > PR c++/87093 > * g++.dg/ext/is_constructible2.C: New.
diff --git a/gcc/cp/method.c b/gcc/cp/method.c index 0b208a8..d75dacb 100644 --- a/gcc/cp/method.c +++ b/gcc/cp/method.c @@ -1144,11 +1144,11 @@ static tree constructible_expr (tree to, tree from) { tree expr; + cp_unevaluated cp_uneval_guard; if (CLASS_TYPE_P (to)) { tree ctype = to; vec<tree, va_gc> *args = NULL; - cp_unevaluated cp_uneval_guard; if (!TYPE_REF_P (to)) to = cp_build_reference_type (to, /*rval*/false); tree ob = build_stub_object (to); diff --git a/gcc/testsuite/g++.dg/ext/is_constructible2.C b/gcc/testsuite/g++.dg/ext/is_constructible2.C new file mode 100644 index 0000000..8f25e7e --- /dev/null +++ b/gcc/testsuite/g++.dg/ext/is_constructible2.C @@ -0,0 +1,12 @@ +// { dg-do compile { target c++11 } } + +#include <type_traits> + +template <typename T> struct x { + operator bool() { + static_assert(!std::is_same<T, T>::value, ""); + return false; + } +}; + +static constexpr auto a = __is_constructible(bool, x<int>);
Tested manually on Linux-x64, running full suite on Linux-PPC64. This seems half-obvious. OK for trunk? Backports? 2018-09-10 Ville Voutilainen <ville.voutilainen@gmail.com> gcc/cp PR c++/87093 * method.c (constructible_expr): We're in an unevaluated context in all cases, not just for class targets. testsuite/ PR c++/87093 * g++.dg/ext/is_constructible2.C: New.