Re: [boost] [mpl] int_<INT_MIN> fails to compile under gcc 4.6

Subject: Re: [boost] [mpl] int_<INT_MIN> fails to compile under gcc 4.6
From: Stirling Westrup (swestrup_at_[hidden])
Date: 2011-03-06 07:11:17

On Sun, Mar 6, 2011 at 5:50 AM, Philipp Reh <sefi_at_[hidden]> wrote:
> Stirling Westrup wrote:
>
>> I'm not actually sure if this is a gcc regression, or a bug in mpl,
>> but the following code, which compiles under gcc 4.5, doesn't do so
>> under gcc 4.6:
>>
>> #include <climits>
>> #include <boost/mpl/int.hpp>
>> typedef boost::mpl::int_<INT_MIN> Foo;
>> Foo f;
>>
>>
>> It produces the errors:
>>
>> /usr/local/include/boost/mpl/aux_/integral_wrapper.hpp: In
>> instantiation of ‘mpl_::int_<-0x00000000080000000>’:
>> test_test.cpp:8:27:   instantiated from here
>> /usr/local/include/boost/mpl/aux_/integral_wrapper.hpp:73:96: error:
>> ‘2147483647’ is not a valid template argument for type ‘int’ because
>> it is a non-constant expression
>> /usr/local/include/boost/mpl/aux_/integral_wrapper.hpp:73:96: error:
>> overflow in constant expression [-fpermissive]
>>
>>
>> I've already created a trak ticket for this (#5268), but was wondering
>> if anyone had any insights as to its cause and/or any workarounds. My
>> guess is that its related to gcc rewriting parts of its constant
>> folding code to support constexpr.
>>
>>
>>
>>
>>
>
> I can confirm that. INT_MIN isn't the only problem, it fails for a lot of
> other values as well.
> Can you please raise this issue on the gcc bugtracker because the release is
> very close.
>

Okay, I have done so. Its bug #48003 on the GCC bugtracker.

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Stirling Westrup
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