| Issue |
76686
|
| Summary |
Definition of function with __attribute__((target_version("..."))) with a non-"default" value completely discarded
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
nabijaczleweli
|
Given:
```
#include <stdlib.h>
namespace {
__attribute__((target_version("default"))) int crc32c() {
return 1;
}
__attribute__((target_version("crc"))) int crc32c() {
// nothing
}
}
int main() {
return crc32c();
}
```
`c++ --target=aarch64-linux-gnu -O3 -g -Wall -Wextra -fno-exceptions -fno-rtti -std=c++20 -D_FILE_OFFSET_BITS=64 repro.cpp -o repro` there is no warning issued.
Given
```cpp
#include <stdio.h>
namespace {
__attribute__((target_version("default"))) int crc32c() {
return 1;
}
__attribute__((target_version("crc"))) int crc32c() {
printf("crc");
}
}
int main() {
return crc32c();
}
```
`c++ --target=aarch64-linux-gnu -O3 -g -Wall -Wextra -fno-exceptions -fno-rtti -std=c++20 -D_FILE_OFFSET_BITS=64 repro.cpp -o repro`
```
$ nm -D repro
U abort@GLIBC_2.17
w __cxa_finalize@GLIBC_2.17
w __gmon_start__
w _ITM_deregisterTMCloneTable
w _ITM_registerTMCloneTable
U __libc_start_main@GLIBC_2.34
```
The body of the function, and the definition itself, is removed completely in both cases.
`Debian clang version 18.0.0 (++20231231112334+c7c912cff945-1~exp1~20231231112352.433)`
![]()
_______________________________________________
llvm-bugs mailing list
[email protected]
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
