rEFInd vs GNU_EFI_3_0_COMPAT

[Toolybird]

Hello!

Over at Arch Linux we have (perhaps unwisely?) proceeded to build rEFInd against gnu-efi-4.x. A few build fixes were applied, then it was released to the general public. It appeared to work fine initially, but then a few annoying issues cropped up.

It soon became clear we should be compiling it with -DGNU_EFI_3_0_COMPAT. This appears to make it behave better.. however, the problems were still not fully resolved... unless we remove the EFIAPI macro in a few key places within gnu-efi, in particular CompareGuid and ReallocatePool. You can see what I mean in this Merge Request: https://gitlab.archlinux.org/archlinux/packaging/packages/gnu-efi/-/merge_requests/1

Do you have any tips for us on why EFIAPI is apparently causing problems here? I'm not at all familiar with UEFI development so would really appreciate your thoughts. Unfortunately, the upstream rEFInd maintainer appears to be very busy these days.

Thanks for any help.