Re: [PATCH v2 0/3] Inline helpers into Rust without full LTO

[Arnd Bergmann]

On Fri, Mar 27, 2026, at 10:02, Arnd Bergmann wrote:
> On Fri, Mar 27, 2026, at 08:56, Geert Uytterhoeven wrote:
> but that only allowed bitfields to be marked as __attribute__((packed))
> in order to get tightly packed fields and return '4' on all architectures,
> while m68k-linux-gcc apparently has all bitfields implicitly packed unless they
> are explicitly marked __attribute__((aligned(x))). This behavior is
> independent of the -malign-int flag.

I had another look and found that this has been in gcc since ELF
support was originally added for m68k:

gcc/config/m68k/linux.h:#undef PCC_BITFIELD_TYPE_MATTERS

All other current Linux/ELF targets get the default from gcc/config/elfos.h

      Arnd