https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66509
--- Comment #16 from Jack Howarth <howarth.at.gcc at gmail dot com> ---
(In reply to m...@gcc.gnu.org from comment #15)
> The fix requires that binutils also support the () spelling as the test runs
> on all x86 systems. Also, it will break systems older then when () was
> first introduced, if it was after filds itself was supported. I don't know
> when each was new.
Seems like a question for H.J. Lu. Also, it looks like we already have a few
instances of that syntax in current gcc trunk...
% grep " (%" gcc/configure
$as_echo 'lock xacquire cmpxchg %esi, (%ecx)' > conftest.s
lock addl %edi, (%eax,%esi)
lock orl $0, (%esp)' > conftest.s
