[PATCH 0/2] callback_only attribute handler bugfixes

Hi,
this patch series fixes two bugs, or rather unhandled errors, in the
callback_only attribute handler.  The first is a missing check for
variadic functions, the second one is a missing early return statement.
Both patches also add testcases for their issues.

Bootstrapped and regtested in tandem on x86_64-linux without
regressions.  OK for master?

Best regards,
Josef

Josef Melcr (2):
  Reject variadic functions in callback_only attribute handler
  Return early if callback_only is not used on a function

 gcc/c-family/c-attribs.cc            | 22 +++++++++++++++++++++-
 gcc/doc/extend.texi                  |  3 ++-
 gcc/testsuite/gcc.dg/attr-callback.c | 21 +++++++++++++++++++++
 3 files changed, 44 insertions(+), 2 deletions(-)

-- 
2.55.0