Re: [Boost-users] boost on apple gcc 4.2

From: Ryo IGARASHI (rigarash_at_[hidden])
Date: 2008-08-06 20:07:01

Hi,

On Fri, Aug 1, 2008 at 2:50 AM, Mat Marcus <mat-lists_at_[hidden]> wrote:
>>> I then conclude that the C++ ABI is fully compatible between 4.0 and
>>> 4.2
>>
>> Right.
>
> [snip, then user hypothesizes as to why there are problems with boost
> under gcc 4.2/libstdc++ 4.0 on current Apple systems]
>
>>> This is the case because boost assumes that a 4.2 compiler implies
>>> 4.2 libraries in flies such as boost/detail/atomic_count_gcc.hpp:
>>>
>>> #if (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 2))
>>> # include <ext/atomicity.h>
>>> #else
>>> # include <bits/atomicity.h>
>>> #endif
>>
>> Yes, this is a bug or faulty assumption in boost.
>
> [snip]
>
>> The 4.2 library issue is a bug in Boost, not a problem with
>> our compiler.  I'd suggest raising the issue on one of the boost
>> mailing lists and see what they say.
>
> Comments?
> Mat

>From Debian GNU/Linux ABI transition history,
I found that gcc 3.0, 3.1, 3.2, 3.3 have C++ ABI compatibility (libstdc++5)
and gcc > 3.4 also have C++ ABI compatibility (libstdc++6).
(Of cource this may not apply on other OSs.)

Note that gcc major version don't jump simultaneously with C++ ABI update.

Regards,
-- 
Ryo IGARASHI
rigarash_at_[hidden]