[Issue 23427] New: ImportC: some bitfield combinations lead to wrong size struct
d-bugmail at puremagic.com
d-bugmail at puremagic.com
Thu Oct 20 02:13:24 UTC 2022
https://issues.dlang.org/show_bug.cgi?id=23427
Issue ID: 23427
Summary: ImportC: some bitfield combinations lead to wrong size
struct
Product: D
Version: D2
Hardware: All
OS: Mac OS X
Status: NEW
Severity: normal
Priority: P1
Component: dmd
Assignee: nobody at puremagic.com
Reporter: dave287091 at gmail.com
On macOS, the following C code compiles without failing a static assertion
using apple clang. Dmd triggers the static assertion. I haven’t tested other
platforms.
_Static_assert(sizeof(unsigned) == 4, "");
struct A {
unsigned x :8;
unsigned y :4;
unsigned z :20;
};
_Static_assert(sizeof(struct A)==4, "");
struct B {
unsigned x :4;
unsigned y :2;
unsigned z :26;
};
_Static_assert(sizeof(struct B)==4, "");
struct C {
unsigned x :4;
unsigned y :4;
unsigned z :24;
};
_Static_assert(sizeof(struct C)==4, ""); // This one fails
--
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