https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104661
Bug ID: 104661
Summary: Catching exception by const value when
exception-object has lvalue-reference constructor
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: fchelnokov at gmail dot com
Target Milestone: ---
This program
```
struct A {
A() {}
A(A&) {}
};
int main() {
try {
throw A{};
}
catch ( const A ) {
}
}
```
is presumably valid and accepted by Clang and MSVC, but GCC complains:
```
error: binding reference of type 'A&' to 'const A' discards qualifiers
10 | catch ( const A ) {
| ^
<source>:3:7: note: initializing argument 1 of 'A::A(A&)'
3 | A(A&) {}
| ^~
```
Demo: https://gcc.godbolt.org/z/as671TGqs
