| Issue |
171461
|
| Summary |
[PAC] `ptrauth.h` triggers `-Wgnu-statement-_expression_-from-macro-expansion`
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
EliaGeretto
|
When including `ptrauth.h` without using `-fptrauth-intrinsics`, `-Wgnu-statement-_expression_-from-macro-expansion` is triggered. That warning is part of `-Wpedantic`.
The issue is caused by the use of GNU statement expressions in the following macro:
https://github.com/llvm/llvm-project/blob/6b58449b2c813588f9c251d4f0963762d6746881/clang/lib/Headers/ptrauth.h#L329-L333
A possible fix is relying on the comma operator:
```c
#define ptrauth_strip(__value, __key) \
( \
(void)__key, \
__value \
)
```
Reproducer:
```c
#include <ptrauth.h>
int main(void) {
ptrauth_strip(&main, ptrauth_key_function_pointer);
return 0;
}
```
Build with: `clang -Wpedantic repro.c`
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