Re: [boost] [mpl] mpl::string, help needed (vacpp, sun, borland)

Subject: Re: [boost] [mpl] mpl::string, help needed (vacpp, sun, borland)
From: Eric Niebler (eric_at_[hidden])
Date: 2009-04-23 12:50:57

Eric Niebler wrote:
> Dmitry Goncharov wrote:
>> This version uses BOOST_WORKAROUND. Please, have a look.
>> Tested on sun c++ 5.9 and gcc4.3.3.
> 
> Thanks. I've merged this patch to trunk after making a few small edits 
> myself, and I've given you credit for the port.

We have a very interesting problem with the Sun compiler. I see from the 
regression reports that the mpl::string test is passing now with sun-5.9 
on SunOS, but it's failing on Linux. The nature of the failure there is 
fascinating, and reveals our first true portability problem with 
multichar literals. Look at the error:

assertion_failed<mpl_::C>(mpl_::failed************boost::is_same<
boost::mpl::string<24930, 0, 0, 0, 0, 0, 0, 0>, 
boost::mpl::string<25185, 0, 0, 0, 0, 0, 0, 0>>::************)

24930 is 0x6162 or 'ab' and 25185 is 0x6261 or 'ba'. The first test that 
is failing is a push_back of 'b' into a string that contains 'a'. This 
looks like an endian problem.

I'm not sure how to proceed. I have no hope of fixing this without 
access to the failing platform. Anyone care to submit a patch?

-- 
Eric Niebler
BoostPro Computing
http://www.boostpro.com