https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110424
Bug ID: 110424
Summary: Bogus ODR warning for FMV member function with -flto
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
Reporter: wwwhhhyyy333 at gmail dot com
CC: marxin at gcc dot gnu.org
Target Milestone: ---
cat m1.h
---
#pragma once
class A
{
public:
int foo1();
};
---
cat m1.cpp
---
#include "m1.h"
__attribute__((target_clones("default","arch=icelake-server")))
int A::foo1()
{
return 0;
}
---
cat m2.cpp
---
#include "m1.h"
int main()
{
A a;
return a.foo1();
}
---
g++ -flto -Werror m1.cpp m2.cpp -o m2
m1.h:6:7: error: ‘foo1’ violates the C++ One Definition Rule [-Werror=odr]
6 | int foo1();
| ^
m1.cpp:9:1: note: ‘_ZN1A4foo1Ev’ was previously declared here
9 | }
| ^
lto1: all warnings being treated as errors
The output binary should quite same as the one without lto, so the warning
seems to be bogus.
