| Issue |
156269
|
| Summary |
Multicharacter constants are not handled correctly in C or C++ before C++23
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
Halalaluyafail3
|
The following programs demonstrate the issues with how Clang handles multicharacter constants.
Program 1:
```c
int main(void){
L'ab';
}
```
Program 2:
```c
int main(void){
u'ab';
}
```
In program 1, multiple characters are used inside of a wchar_t character constant (prefixed with L). This is valid in C and valid in C++ before C++23. In program 2, multiple characters are used inside of a UTF-16 character constant (prefixed with u). This is valid in C before C23. This also applies to UTF-32 character constants (prefixed with U) as well. It seems that in Clang version 14 all language modes operate using the C++23 rules so that only character constants with no prefix can contain multiple characters. GCC correctly handles these cases, except that it doesn't reject program 2 in C23 which I have made a bug report for: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121739.
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