| Issue |
131647
|
| Summary |
[clang] -Wpadded-bitfield warns a wrong number of padded bytes with ms_struct
|
| Labels |
|
| Assignees |
|
| Reporter |
therealcoochieman
|
For the following struct:
```c
struct __attribute__((ms_struct)) Foo {
long long x;
char a : 1;
long long b : 1;
};
```
We should have a padding of 63 bits between `a` and `b` as the compiler aims for an 8 byte alignment, with `a` taking 1 bit and `b` having a different underlying type.
The following command `clang -Wpaded foo.cc` gives out the following warning:
```
test.cc:4:13: warning: padding struct 'Foo' with 7 bytes to align 'yy' [-Wpadded-bitfield]
4 | long long yy : 1;
| ^
test.cc:1:35: warning: padding size of 'Foo' with 63 bits to alignment boundary [-Wpadded]
1 | struct __attribute__((ms_struct)) Foo {
| ^
```
>From my understanding, something is wrong with the way the alignment warning for `-Wpadded-bitfield` is computed. Can somebody confirm this?
If confirmed, I would like to work on this issue.
![]()
_______________________________________________
llvm-bugs mailing list
llvm-bugs@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
