https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87921
Bug ID: 87921
Summary: Incorrect error "storage size of [array] isn't known
(when it is)
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: cuzdav at gmail dot com
Target Milestone: ---
I'm getting an error for what I believe to be valid code. Here's a complete,
minimal example to reproduce it:
// ================================
template<class H>
struct X {
static constexpr long Ary[] = { 1L };
long foo() { return Ary[0]; }
};
void f() {
class L{};
X<L> foo{};
}
// ================================
https://godbolt.org/z/2tGwxo
#1 with x86-64 gcc (trunk)
<source>:3:27: error: storage size of 'X<f()::L>::Ary' isn't known
3 static constexpr long Ary[] = { 1L };
^~~
Clearly the size of the array should be known.
- locally, on both mac and linux I see same results
- in g++6.3, C++17 mode it compiles
- in 7.3 and all versions up through 8.2 and the trunk, in C++ 17 mode it does
not compile.
- in clang++, it compiles.
- moving the function-local class L to file-scope fixes it.
- moving the array outside of the template class fixes it.
- explicitly providing a size to the array declaration fixes it.
