https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112620
Bug ID: 112620
Summary: Changes to the referenced object in exception handler
are lost after rethrow
Product: gcc
Version: 13.2.1
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
#include <cstdio>
int main() {
int i;
try {
try {
throw (int*)0;
} catch (int*& p) {
p = &i;
throw;
}
}
catch (int*& p) {
printf("%p", (void*)p);
}
}
prints some not-null value in Clang and MSVC, which is correct according to
https://eel.is/c++draft/except.handle#15
> When the handler declares a reference to an object, any changes to the
> referenced object are changes to the exception object and will have effect
> should that object be rethrown.
But GCC prints (nil) here. Online demo: https://godbolt.org/z/n6s6bc17s
