Eric Lemings wrote:
Is this a bug or new behavior?  If the latter, what is this attributed
to?

FYI gcc-bugs isn't the best place to ask questions, as it is mostly used for output from our bug database.

I'm not a C++ expert, so I'm not the right person to say for sure, but this looks like an accidental bug to me. There were patches added to change the bitfield type representation, the is_bitfield_expr_with_lowered_type change, which is for PR 26534. I believe these patches have an error.

It looks to me like the bug is in standard_conversion in cp/calls.c at these lines
          if (bitfield_type)
            from = strip_top_quals (bitfield_type);
This sets from, but fails to set fcode, resulting in an inconsistency. In this case, fcode is INTEGER_TYPE and from is now an enumeral type after originally being an integer type. This causes a failure further down in the tcode == BOOLEAN_TYPE code where we fail to match the conditions due to this inconsistency.

I'd suggest opening a bug report.
--
Jim Wilson, GNU Tools Support, http://www.specifix.com

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