On 26 April 2011 13:40, Anna Ceguerra wrote:
> Hi,
>
>
> On 26/04/11 26/04/11 9:07 PM, "Jonathan Wakely" <jwakely.gcc@xxxxxxxxx>
> wrote:
>
>> On 26 April 2011 01:52, Anna Ceguerra wrote:
>>>
>>> Thanks for your reply, it successfully built in one go, and I successfully
>>> installed it. However when I try to compile using the new compiler, I get
>>> the following error:
>>>
>>> /usr/local/lib/gcc/i386-apple-darwin10.7.0/4.6.1/../../../../include/c++/4.6
>>> .1/tr1/special_function_util.h: In function ‘bool
>>> std::tr1::__detail::__isnan(_Tp)’:
>>> /usr/local/lib/gcc/i386-apple-darwin10.7.0/4.6.1/../../../../include/c++/4.6
>>> .1/tr1/special_function_util.h:113:19: error: expected unqualified-id before
>>> ‘(’ token
>>>
>>> This is the relevant section in the file:
>>>
>>> #if _GLIBCXX_USE_C99_MATH && !_GLIBCXX_USE_C99_FP_MACROS_DYNAMIC
>>>
>>> /// This is a wrapper for the isnan function. Otherwise, for NaN,
>>> /// all comparisons result in false. If/when we build a std::isnan
>>> /// out of intrinsics, this will disappear completely in favor of
>>> /// std::isnan.
>>> template<typename _Tp>
>>> inline bool __isnan(const _Tp __x)
>>> {
>>> return std::isnan(__x); // it is failing here
>>> }
>>>
>>> #else
>>>
>>> template<typename _Tp>
>>> inline bool __isnan(const _Tp __x)
>>> {
>>> return __builtin_isnan(__x);
>>> }
>>>
>>> template<>
>>> inline bool __isnan<float>(const float __x)
>>> {
>>> return __builtin_isnanf(__x);
>>> }
>>>
>>> template<>
>>> inline bool __isnan<long double>(const long double __x)
>>> {
>>> return __builtin_isnanl(__x);
>>> }
>>>
>>> #endif
>>>
>>> Am I configuring the program incorrectly?
>>
>> It's impossible to know because you haven't shown your program. It
>> might be a bug in the library, I don't think i386-darwin is a very
>> well tested configuration, or it could be something you've done wrong.
>>
>> Please try to reproduce the error with a minimal example to show
>> whether you get that error just from including a header, or only under
>> certain circumstances.
>
> I managed to track it down to the following test.cpp file:
>
> #include <cmath>
> #include <mgl/mgl.h>
> #include <algorithm>
>
> Where mgl is from the wxWidgets library, version 2.8.11
>
> When I changed the order to:
> #include <cmath>
> #include <algorithm>
> #include <mgl/mgl.h>
>
> It worked.
That would imply the mgl.h header does something it shouldn't, such as
defining isnan as a macro, or something else which breaks the standard
library header.
Glad you got it working.
