| Issue |
84712
|
| Summary |
[clang] Invalid rejection of enum arithmetic
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
davidstone
|
The following valid translation unit
```cpp
enum e1 {
value = 0
};
enum e2 {
a = 0,
b = e1::value,
c = a + b
};
```
is incorrectly rejected by clang when compiled in C++26 mode with
```console
<source>:8:8: error: invalid arithmetic between different enumeration types ('e2' and 'e1')
8 | c = a + b
| ~ ^ ~
1 error generated.
Compiler returned: 1
```
See it live: https://godbolt.org/z/v4sG9YqMb
In earlier versions of C++, it incorrectly warns saying the conversion is deprecated.
This was accepted in clang 18.1.0, but is failing on current trunk (15e9478187d594016c2c355d8688be2e0a9b554e).
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