https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127818
Bug ID: 127818
Summary: constant expression error from usage of string literal
in templated contexts
Product: gcc
Version: 17.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: irvsrc at gmail dot com
Target Milestone: ---
Example:
```
auto constexpr fn(auto...) {
auto constexpr v = true ? "a" : "b"; // error
}
auto main() -> int {
fn();
}
```
Output:
```
<source>: In instantiation of 'constexpr auto fn(auto:1 ...) [with auto:1 =
{}]':
<source>:5:7: required from here
5 | fn();
| ~~^~
<source>:2:20: error: '(const char*)"a"' is not a constant expression
2 | auto constexpr v = true ? "a" : "b"; // error
| ^
```
Notes:
- The error occurs across all GCC and C++ versions from what I have tested.
- The error occurs in all templates (e.g variable templates, class templates,
templated lambdas).
GCC (trunk)
-std=c++26
