Re: [boost] Failures for GCC 4.4.1 with gnu++0x

Subject: Re: [boost] Failures for GCC 4.4.1 with gnu++0x
From: Christopher Jefferson (chris_at_[hidden])
Date: 2009-09-05 12:47:36

On 5 Sep 2009, at 13:25, Beman Dawes wrote:

> On Thu, Sep 3, 2009 at 11:27 AM, Beman Dawes<bdawes_at_[hidden]> wrote:
>> Thanks to Noel Belcourt, the trunk Sandia-gcc tests show results
>> side-by-side for gcc 4.4.1 without and with C++0x features enabled.
>>
>> See http://beta.boost.org/development/tests/trunk/developer/summary.html
>>
>> Several Boost libraries are passing without 4.4.1 C++0x features  
>> but failing
>> with them:
>>
>> http://beta.boost.org/development/tests/trunk/developer/assign.html
>> ...
>>
>
> I missed iostreams. The problem seems to be a bug in gcc. This  
> program:
>
> #include <utility>
>
> int main()
> {
>  std::pair<int, int*> x(0,0);
>  return 0;
> }
>
> compiles without -std=gnu++0x, but with -std=gnu++0x gets an error:
>
> c:\gcc\bin\../lib/gcc/i386-pc-mingw32/4.4.0/../../../../include/c++/ 
> 4.4.0/bits/stl_pair.h:
> In constr
> uctor 'std::pair<_T1, _T2>::pair(_U1&&, _U2&&) [with _U1 = int, _U2 =
> int, _T1 = int, _T2 = int*]':
> cvt-0-to-ptr.cpp:5:   instantiated from here
> c:\gcc\bin\../lib/gcc/i386-pc-mingw32/4.4.0/../../../../include/c++/ 
> 4.4.0/bits/stl_pair.h:90:
> error:
> invalid conversion from 'int' to 'int*'

This is technically a bug in the C++0x draft standard, but one which I  
hope will be fixed somehow before it is finalised, as it will break  
existing valid code, like this.

Chris