https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105460
Bug ID: 105460
Summary: sizeof (unsigned int) != sizeof (uint8_t *)
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: zhonghao at pku dot org.cn
Target Milestone: ---
Clang's comments say there is an `unsigned int`-sized "reserved" member here,
because when the objc4 modern runtime is used on LP64 platforms, there would
otherwise be a 32-bit-sized hole here for alignment reasons.
However, it doesn't actually add the "reserved" field to its AST data
structures.
GCC *does* add the field explicitly. On LP64, adding it or not is irrelevant.
But on AVR, sizeof (unsigned int) == sizeof (uint8_t *), and it matters.
An example is
from:https://github.com/mhjacobson/avr-objc/commit/6187e336d706f1a87a7f0cbd9efa838f9d966737
This means that I have to compile Objective-C code either all with clang or all
with GCC.
