On 21/12/2021 17:05, Stefan Ring via Gcc-help wrote: > On Tue, Dec 21, 2021 at 4:40 PM Adrian Moreno via Gcc-help > <gcc-help@xxxxxxxxxxx> wrote: >> >> I'd really appreciate any hint or idea to try to understand this problem. > > I guess the compiler doesn't like the dereferencing of uninitialized > pointers (in the sizeof expressions). I am not 100% sure that this > counts as dereferencing, but I would assume so. Because of this the > compiler will be free to behave however it likes to. > The operand of a sizeof expression is not evaluated (unless it is a VLA). So there is no problem with the "member1 = malloc(sizeof *member1);" lines. (Which is fortunate, because it is a very common idiom!) I think the next step would be to start pulling in some of the definitions for the various macros here, and then trying to reduce the code further to get a smaller test case.
