https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119050
Bug ID: 119050
Summary: libstdc++ headers are not `-Wsystem-headers -Wundef `
friendly
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: pinskia at gcc dot gnu.org
Target Milestone: ---
Created attachment 60605
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=60605&action=edit
warnings with -Wundef
A simple:
```
#include <iostream>
```
Causes the attached warnings when used with `-Wsystem-headers -Wundef `.
I am not 100% sure with -Wundef should ever be used with C++ because the
recommended way to using the C++ feature macros is just use them (without
testing if they are defined) and comparing with a specific date.
So I don't mind if this will be closed as won't fix either.
Or maybe -Wundef can be refinded not to warn about the C++ feature macros ...
