https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87152
Bug ID: 87152
Summary: internal compiler error: in tsubst_copy, at
cp/pt.c:15484
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: tiagomacarios at gmail dot com
Target Milestone: ---
https://godbolt.org/z/RnO6a-
#include <array>
#include <cmath>
#include <iostream>
template<bool ... bits>
constexpr int int_from_bits()
{
constexpr auto a = std::array{bits...};
int sum = 0;
for (int index = 0; bool const b : a)
{
sum += b ? exp2(index) : 0;
}
return sum;
}
int j = int_from_bits<false,false,true>();
<source>: In instantiation of 'constexpr int int_from_bits() [with bool ...bits
= {false, false, true}]':
<source>:19:40: required from here
<source>:13:25: internal compiler error: in tsubst_copy, at cp/pt.c:15486
13 | sum += b ? exp2(index) : 0;
| ^~~~~
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
Compiler returned: 1
