[Freewx-maint] Bug#824264: wx3.0-headers: Define wxIsNaN() as std::isnan() in C++11 mode

[Benjamin Drung]

Package: wx3.0-headers
Version: 3.0.2+dfsg-1.3
Severity: important
Tags: upstream patch

Dear Maintainer,

Audacity (git master) fails to build with g++ 5.3.1:

In file included from /usr/include/wx-3.0/wx/gdicmn.h:23:0,
                 from /usr/include/wx-3.0/wx/utils.h:26,
                 from BlockFile.cpp:51:
BlockFile.cpp: In function ‘void ComputeMinMax256(float*, float*, float*, int*)’:
/usr/include/wx-3.0/wx/math.h:91:31: error: ‘isnan’ was not declared in this scope
     #define wxIsNaN(x) isnan(x)
                               ^
BlockFile.cpp:325:11: note: in expansion of macro ‘wxIsNaN’
       if (wxIsNaN(summary256[3*i+2]))
           ^
/usr/include/wx-3.0/wx/math.h:91:31: note: suggested alternative:
     #define wxIsNaN(x) isnan(x)
                               ^
BlockFile.cpp:325:11: note: in expansion of macro ‘wxIsNaN’
       if (wxIsNaN(summary256[3*i+2]))
           ^
In file included from /usr/include/wx-3.0/wx/math.h:58:0,
                 from /usr/include/wx-3.0/wx/gdicmn.h:23,
                 from /usr/include/wx-3.0/wx/utils.h:26,
                 from BlockFile.cpp:51:
/usr/include/c++/5/cmath:641:5: note: ‘std::isnan’
     isnan(_Tp __x)
     ^
make[3]: *** [audacity-BlockFile.o] Error 1

isnan() is not defined, but std::isnan() is defined. Thus use
std::isnan() for all C++11 compilers, since isnan() is part of C++11.
The patch was accepted upstream. Please apply that patch to the package.
I will prepare an NMU for that.

[1] https://github.com/wxWidgets/wxWidgets/pull/283

-- 
Benjamin Drung
Debian & Ubuntu Developer