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On the git version of efivar ( https://github.com/rhboot/efivar , currently at c745bb55c185552e2042324ee9cbfc8ebd1786df ), if one runs the following:

dnf builddep efivar
make
make abicheck

It will result in a call like

abidiff \
	--suppr abignore \
	--headers-dir2 /builddir/build/BUILD/efivar-37/src/include/efivar/ \
	libefivar.abixml \
	libefivar.so

which fails with

Functions changes summary: 0 Removed, 1 Changed (42 filtered out), 0 Added functions
Variables changes summary: 0 Removed, 0 Changed (43 filtered out), 0 Added variables

1 function with some indirect sub-type change:

  [C] 'function int _efi_set_variable(efi_guid_t, const char*, uint8_t*, size_t, uint32_t)' at lib.c:33:1 has some indirect sub-type changes:
    parameter 1 of type 'typedef efi_guid_t' changed:
      underlying type 'struct efi_guid_t' at efivar-types.h:13:1 changed:
        type name changed from 'efi_guid_t' to '__anonymous_struct__6'
        type size hasn't changed
        no data member changes (5 filtered);

But only on RHEL 9.  It correctly passes on el8, as well as Fedoras 33-36.

libabigail-2.3-1.el9 has been built for RHEL9 and fixes this issue.

Verified with libabigail-2.3-1.el9.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (libabigail bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:6713