| Issue |
60958
|
| Summary |
Clang -E incorrect -Wunicode diagnostic
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
andyhhp
|
Discovered entirely accidentally while trying to work around #60792
Given
```
$ cat hdr.h
.macro test uniq
mov $\uniq, %eax
.endm
$ cat src.c
#include "hdr.h"
$ clang-15 -E src.c -o out.i
In file included from src.c:1:
./hdr.h:2:11: warning: \u used with no following hex digits; treating as '\' followed by identifier [-Wunicode]
mov $\uniq, %eax
^
```
But there's are no strings here, and no context AFAICT where it would be legitimate to interpret `\u` as a unicode escape in the first place.
But if I rename src.c to src.S, it behaves differently
```
$ cp src.c src.S
$ clang-15 -E src.S -o out.i
$
```
and completes with no complaints.
Clearly this diagnostic is conditional on the file extension (which isn't great behaviour to start with), but I don't think it's a legitimate diagnostic for `*.c` files in the first place either.
It's worth saying for completeness that macros written entirely at the C level work fine, because they have to be written as
```
asm (".macro test uniq; mov $\\uniq, %eax; .endm");
```
with the backslash needing to be escaped, rather than the u.
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