| Issue |
86900
|
| Summary |
clang++ does not comply with C++ standard normalization rules
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
fmayer
|
https://timsong-cpp.github.io/cppwp/lex.name#1: The program is ill-formed if an identifier does not conform to Normalization Form C as specified in the Unicode Standard.
clang++ accepts without warning a program that uses a non-canonical umlaut
```
int ü() {
return 1;
}
int main() {
return ü();
}
```
hex dump of the program
```
00000000: 696e 7420 c3bc 2829 207b 0a20 2072 6574 int ..() {. ret
00000010: 7572 6e20 313b 0a7d 0a0a 696e 7420 6d61 urn 1;.}..int ma
00000020: 696e 2829 207b 0a20 2072 6574 7572 6e20 in() {. return
00000030: 75cc 8828 293b 0a7d 0a u..();.}.
```
This particular program confusingly fails with
```
test.cpp:6:10: error: use of undeclared identifier 'ü'
return ü();
^
1 error generated.
```
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