https://llvm.org/bugs/show_bug.cgi?id=25707
Bug ID: 25707
Summary: [GCC compatibility] different layout for ms_struct
with bit-field
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Frontend
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
$ cat test3.c
#include <stddef.h>
#include <stdio.h>
struct __attribute__((ms_struct)) B {
char AField;
int b : 1;
char BField;
};
int main() {
printf("sizeof(struct B) = %ld\n", sizeof(struct B));
printf("offsetof(struct B, BField) = %ld\n", offsetof(struct B, BField));
printf("__alignof(struct B) = %ld\n", __alignof(struct B));
}
$ clang test3.c && ./a.out
sizeof(struct B) = 12
offsetof(struct B, BField) = 8
__alignof(struct B) = 4
$ gcc test3.c && ./a.out
sizeof(struct B) = 8
offsetof(struct B, BField) = 5
__alignof(struct B) = 4
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