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Re: attribute((mode(byte))) no longer works in typedef

From: Paul Koning <paul_koning at dell dot com>
To: Richard Henderson <rth at redhat dot com>
Cc: "gcc at gcc dot gnu dot org List" <gcc at gcc dot gnu dot org>
Date: Fri, 17 Jun 2011 14:30:35 -0400
Subject: Re: attribute((mode(byte))) no longer works in typedef
References: <793B7C16-D305-4FCB-8433-32A9DB58368B@dell.com> <4DFB99AF.2030605@redhat.com>

On Jun 17, 2011, at 2:15 PM, Richard Henderson wrote:

> On 06/17/2011 08:54 AM, Paul Koning wrote:
>> In GCC 3.3.3, I had a typedef with attribute((mode(byte))) on it.  That worked (the resulting type had size 1).
>> 
>> In GCC 4.5.1, this no longer works; the attribute is silently ignored.
> 
> It certainly does work.  libgcc relies on it.
> 
> You'll have to file a proper bug report for your case.

I did some more testing.  The actual answer is that the compiler has the correct sizeof() but GDB no longer does.  This causes value printing in gdb to get messed up.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49459

	paul

References:
- attribute((mode(byte))) no longer works in typedef
  - From: Paul Koning
- Re: attribute((mode(byte))) no longer works in typedef
  - From: Richard Henderson

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