| Issue |
131218
|
| Summary |
Arm CSSC not supported in target_version/target_clones
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
tavianator
|
Compiling this file
```c
__attribute__((target_clones("cssc", "default")))
int foo(int x) {
return __builtin_popcount(x);
}
```
with `clang --rtlib=compiler-rt` warns that
```
<source>:1:31: warning: unsupported 'cssc' in the 'target_clones' attribute string; 'target_clones' attribute ignored [-Wignored-attributes]
1 | __attribute__((target_clones("cssc", "default")))
| ^
<source>:1:31: warning: version list contains entries that don't impact code generation [-Wfunction-multiversion]
```
However, Clang does understand `-march=armv8.7-a+cssc`, so it knows about the extension. Is there a different spelling for the `target_clones` attribute value?
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