https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97091
Bug ID: 97091
Summary: Demangling the name of the type of a lambda accepting
variadic auto parameters fails
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: dominik.muth at gmx dot de
Target Milestone: ---
Demangling the mangled name of [](auto...){} fails with gcc 5, 8, 9, 10, and
11.
It works with gcc 6 and 7, however the mangled name is different, see output
below. The demangled name main::{lambda(auto:1, ...)#1} looks wrong to me.
Should it be main::{lambda(auto:1...)#1} instead?
Here is a fairly minimal example to reproduce the bug:
// https://wandbox.org/permlink/FVonGE60X1Xi651E
#include <iostream>
#include <cxxabi.h>
using namespace std;
template <typename T>
static string nametype(T v)
{
return typeid(decltype(v)).name();
}
template <typename T>
static string strtype(T v)
{
return abi::__cxa_demangle(nametype(v).c_str(), nullptr, nullptr, nullptr);
}
template <typename T>
static void puttype(T v)
{
cout << nametype(v) << endl;
cout << "-> " << strtype(v) << endl;
}
int main()
{
cout << __GNUC__ << "." << __GNUC_MINOR__ << "." << __GNUC_PATCHLEVEL__ <<
" " << __GLIBCXX__ << endl;
puttype([](auto...){});
}
/*
output:
5.5.0 20171010
Z4mainEUlT_zE_
terminate called after throwing an instance of 'std::logic_error'
what(): basic_string::_M_construct null not valid
6.3.0 20161221
Z4mainEUlT_zE_
-> main::{lambda(auto:1, ...)#1}
7.3.0 20180125
Z4mainEUlT_zE_
-> main::{lambda(auto:1, ...)#1}
8.3.0 20190222
Z4mainEUlDpT_E0_
terminate called after throwing an instance of 'std::logic_error'
what(): basic_string::_M_construct null not valid
9.3.0 20200312
Z4mainEUlDpT_E0_
terminate called after throwing an instance of 'std::logic_error'
what(): basic_string::_M_construct null not valid
10.1.0 20200507
Z4mainEUlDpT_E_
terminate called after throwing an instance of 'std::logic_error'
what(): basic_string::_M_construct null not valid
11.0.0 20200915
Z4mainEUlDpT_E_
terminate called after throwing an instance of 'std::logic_error'
what(): basic_string::_M_construct null not valid
*/
