https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91343
Bug ID: 91343
Summary: Spurious strict-aliasing warning with template class
inheritance.
Product: gcc
Version: 9.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: a-yee at u dot northwestern.edu
Target Milestone: ---
The following code leads to a strict-aliasing warning. But there is no aliasing
here.
https://godbolt.org/z/m2P_4-
Possibly Related or Duplicate:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89960
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81152
#include <iostream>
using namespace std;
struct Parent{
int data = 0;
};
template <typename Context>
class Child : public Parent{
public:
static int func(){
Child tp;
int x = tp.data;
return x;
}
};
template class Child<int>;
int main(){
}
<source>: In static member function 'static int Child<Context>::func()':
<source>:13:17: warning: dereferencing type-punned pointer will break
strict-aliasing rules [-Wstrict-aliasing]
13 | int x = tp.data;
| ^~
ASM generation compiler returned: 0
<source>: In static member function 'static int Child<Context>::func()':
<source>:13:17: warning: dereferencing type-punned pointer will break
strict-aliasing rules [-Wstrict-aliasing]
13 | int x = tp.data;
| ^~
