[Bug c/96293] Extraneously noisy "taking address of packed member may result in an unaligned pointer value"

[2909820123 at qq dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96293

devbeacon <2909820123 at qq dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |2909820123 at qq dot com

--- Comment #11 from devbeacon <2909820123 at qq dot com> ---
Here is a workaround to remove this warning:

Instead of using attribution, using pragma pack/pop
e.g:


#pragma pack(push)
#pragma pack(1)     /* set alignment to 1 byte boundary */

struct PackedStruct0 {
        char a;
        int b;
}__attribute__((packed, aligned(4)));

struct PackedStruct {
        char a;
        int b;
};

#pragma pack(pop)

void f4s(int* p)
{
    *p = 0x12345678;
}

int main()
{

    PackedStruct0 ps0;
    f4s(&ps0.b);  // gcc 11.4.0  will fire Waddress-of-packed-member warning

    PackedStruct ps;
    f4s(&ps.b);  // no warning fired

}