https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104470
Bug ID: 104470
Summary: internal compiler error: Segmentation fault compiling
std::variant with -std=c++20
Product: gcc
Version: 10.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: serpent7776 at gmail dot com
Target Milestone: ---
Created attachment 52396
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52396&action=edit
Preprocessed source
I encountered an internal compiler error while compiling the following code in
c++20 mode (no other flags are needed):
#include <variant>
template <typename T>
struct Foo
{
T value;
};
template <typename T>
struct Bar
{
T value;
};
template <typename T>
using V = std::variant<Foo<T>, Bar<T>>;
int main()
{
V e = Foo("a");
}
When I switch to c++17 mode compiler does not crash.
I tested it on g++ 10.3.0 on FreeBSD 12.3-RELEASE-p1, but I can also reproduce
it on trunk version here https://godbolt.org/z/vn5Ws14Ma
Full error:
# g++10 -std=c++20 ice.ii
In file included from ice.cpp:1:
/usr/local/lib/gcc10/include/c++/variant: In substitution of 'template<class
... _Types> template<class _Tp, class> using __accepted_type =
std::variant<_Types>::__to_type<__accepted_index<_Tp> > [with _Tp = _Tp&&;
<template-parameter-2-2> = typename std::enable_if<std::variant<Foo<T>, Bar<T>
>::__not_self<_Tp&&>, void>::type; _Types = {Foo<T>, Bar<T>}]':
ice.cpp:20:15: required from here
/usr/local/lib/gcc10/include/c++/variant:1335:36: internal compiler error:
Segmentation fault
1335 | using __accepted_type = __to_type<__accepted_index<_Tp>>;
| ^~~~~~~~~~~~~~~~~~~~
libbacktrace could not find executable to open
