https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87060
--- Comment #1 from Yevheniy Soloshenko <yso at melexis dot com> ---
Ok, my fault. Integer promotion in action.
The code below is fine.
```
void test_u8 (void)
{
if ((unsigned char)(u8 + 1)) { u8 = 1; }
}
```
