https://llvm.org/bugs/show_bug.cgi?id=31050
Bug ID: 31050
Summary: False positive warning of -Waddress-of-packed-member
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: yunl...@chromium.org
CC: dgre...@apple.com, llvm-bugs@lists.llvm.org
Classification: Unclassified
#include <stdio.h>
typedef struct __attribute__ ((packed, aligned(4)))
{
short a;
short b;
int c;
} A;
int main() {
A s;
s.c = 0;
int* ptr = &s.c;
printf("%d", *ptr);
return 0;
}
Struct A is explictly requested to be aligned to 4 bytes. Therefore, A.c is
also aligned to 4 bytes.
However clang incorrectly complains:
taking address of packed member 'c' of class or structure 'A' may result in an
unaligned pointer value
[-Waddress-of-packed-member]
int* ptr = &s.c;
Thanks,
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