https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100296
Bug ID: 100296
Summary: [10.x regression] offsetof with
non-constant-expression offset no longer accepted in
C++ mode
Product: gcc
Version: 11.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: davem at devkitpro dot org
Target Milestone: ---
The following code compiles fine as C but produces " error: 'idx' is not a
constant expression" with gcc 11.1.0
#include <stdint.h>
#include <stddef.h>
struct foo
{
uint8_t things[12];
};
uintptr_t getThing(const unsigned idx)
{
return offsetof(struct foo, things[idx]);
}
The code compiles fine with gcc 6.x through 10.x
gcc 5.x says "error: 'idx' cannot appear in a constant-expression"
