https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119500
Bug ID: 119500
Summary: False positive "unused variable" warning on static
variable templates with custom section placement
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: palchak at google dot com
Target Milestone: ---
A false "defined but not used" warning is emitted for static variable templates
with custom section placement.
Example source:
```
template<int ID>
[[gnu::section(".custom")]]
static int id = ID;
int main() {
return id<42>;
}
```
Compile command:
`g++ example.cc -o example -Wunused`
Output:
```
example.cc:3:12: warning: ‘id<ID>’ defined but not used [-Wunused-variable]
3 | static int id = ID;
| ^~
```
The variable template is very clearly used.
Compiler explorer reproduction:
https://godbolt.org/z/hjsabfcfT
