https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95317
Bug ID: 95317
Summary: [7 regression] ICE on valid C++14 code, in
tsubst_copy, at cp/pt.c:15649
Product: gcc
Version: 9.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: fxcoudert at gcc dot gnu.org
Target Milestone: ---
ICE on valid C++14 code:
$ cat b.C
#include <iostream>
template <int I>
struct num
{
enum { value = I };
};
#define VALUEOFNUM(x) std::remove_reference_t<decltype(x)>::value
template <typename TYPE>
void foo()
{
auto test = [&](auto i)
{
enum { VALUE = VALUEOFNUM(i) };
std::cout << VALUE;
};
test(num<0>());
test(num<1>());
}
int main()
{
foo<void>();
}
$ g++-9 b.C
b.C: In instantiation of 'void foo() [with TYPE = void]':
b.C:27:15: required from here
b.C:18:22: internal compiler error: in tsubst_copy, at cp/pt.c:15649
18 | std::cout << VALUE;
| ^~~~~
libbacktrace could not find executable to open
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://github.com/Homebrew/homebrew-core/issues> for instructions.
Works fine with GCC up to version 6, but regresses at 7 and later.
