https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89197
Bug ID: 89197
Summary: Templated Functions const auto assignment causes
internal compiler error
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: cchancey at comconcepts dot com
Target Milestone: ---
Created attachment 45601
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45601&action=edit
precompoiled .i as mentioned in bug reporting guide
GCC Version:
gcc version 8.2.0
System:
x86_64-linux-gnu
Configured with:
./configure --disable-multilib
Command given:
gcc -v main.cpp
Error Message:
main.cpp: In function ‘uint32_t foo_fails(const std::bitset<_Nb>&, int, int)’:
main.cpp:23:57: internal compiler error: in split_nonconstant_init_1, at
cp/typeck2.c:723
const auto start_reverse_index=int {start_bit+length-1};
How to replicate:
Compile code below.
#include <bitset>
#include <cmath>
//works
uint32_t foo_works_non_templated(const int start,
const int length) {
const auto start_reverse_index=int {start+length-1};
const auto end_reverse_index=int {start-1};
return 0;
}
//works
template <size_t N>
uint32_t foo_works(const std::bitset<N>& bits, const int start_bit,
const int length) {
const int start_reverse_index {start_bit+length-1};
const int end_reverse_index {start_bit-1};
return 0;
}
//min example size_t
template <size_t N>
uint32_t foo_fails(const std::bitset<N>& bits, const int start_bit,
const int length) {
const auto start_reverse_index=int {start_bit+length-1};
const auto end_reverse_index=int {start_bit-1};
return 0;
}
//min example not using std::bitset
template <int n>
uint32_t foo_fails(const int start,
const int length) {
const auto start_reverse_index=int {start+length-1};
const auto end_reverse_index=int {start-1};
return 0;
}
