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From: "jason at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/67064] Register asm variable broken
Date: Mon, 03 Aug 2015 15:47:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67064

--- Comment #17 from Jason Merrill <jason at gcc dot gnu.org> ---
(In reply to Daniel Gutson from comment #15)
> (In reply to Jason Merrill from comment #14)
> >      '-Wpedantic' does not cause warning messages for use of the
> >      alternate keywords whose names begin and end with '__'.
> 
> Do you refer to the __asm__?

Yes.  I don't think we should warn about __asm__ either by default or with
-pedantic, though perhaps there should be an even-more-pedantic mode that
complains about __keywords__ outside system headers.

For the original bug, I think force_paren_expr needs to ignore
DECL_HARD_REGISTER variables.

(In reply to Jens Maurer from comment #16)
> Agreed, but this:
> 
> struct s {
>   int i;
> };
> register struct s *reg asm( "si" );
> 
> (note: no double underscores) should issue a diagnostic for violating
> 7.1.1p2 when invoking
> 
> > g++ -std=c++14 -Wall -Wextra -Wpedantic -c reg-asm.cc 
> 
> right?  It doesn't.  Total silence.

Yes, that should give a pedwarn.