https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114183
Bug ID: 114183
Summary: Lambda constexpr works in msvc but not in gcc
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: jlame646 at gmail dot com
Target Milestone: ---
The following valid(afaik) program is rejected by gcc:
https://godbolt.org/z/xhes5fvoc
```
int main() {
constexpr auto func = []()constexpr { return 1; };
auto i = []{return func();};
}
```
GCC says:
```
<source>: In lambda function:
<source>:3:28: error: 'func' is not captured
3 | auto i = []{return func();};
| ~~~~^~
<source>:3:15: note: the lambda has no capture-default
3 | auto i = []{return func();};
| ^
<source>:2:20: note: 'constexpr const main()::<lambda()> func' declared here
2 | constexpr auto func = []()constexpr { return 1; };
|
```
https://en.cppreference.com/w/cpp/language/lambda says:
> A lambda expression can read the value of a variable without capturing it if
> the variable
> is constexpr and has no mutable members.
