When make get error：‘isnan’ was not declared in this scope

[icecity96]

When I make I got the following error：

/opt/cocos2d-x/cocos/2d/CCActionCamera.cpp:197:22: error: ‘isnan’ was not declared in this scope
     if( isnan(_angleX) )
                      ^
/opt/cocos2d-x/cocos/2d/CCActionCamera.cpp:197:22: note: suggested alternative:
In file included from /usr/include/c++/5.3.0/random:38:0,
                 from /opt/cocos2d-x/cocos/base/ccRandom.h:29,
                 from /opt/cocos2d-x/cocos/base/ccMacros.h:73,
                 from /opt/cocos2d-x/cocos/math/CCGeometry.h:32,
                 from /opt/cocos2d-x/cocos/2d/CCAction.h:32,
                 from /opt/cocos2d-x/cocos/2d/CCActionInterval.h:33,
                 from /opt/cocos2d-x/cocos/2d/CCActionCamera.h:31,
                 from /opt/cocos2d-x/cocos/2d/CCActionCamera.cpp:28:
/usr/include/c++/5.3.0/cmath:641:5: note:   ‘std::isnan’
     isnan(_Tp __x)
cocos/CMakeFiles/cocos2d.dir/build.make:86: recipe for target 'cocos/CMakeFiles/cocos2d.dir/2d/CCActionCamera.cpp.o' failed
make[2]: *** [cocos/CMakeFiles/cocos2d.dir/2d/CCActionCamera.cpp.o] Error 1
CMakeFiles/Makefile2:419: recipe for target 'cocos/CMakeFiles/cocos2d.dir/all' failed
make[1]: *** [cocos/CMakeFiles/cocos2d.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2

OS:Arch linux
Compiler: GNU 5.3.0

[icecity96]

I have solved this problem,just using std::isnan repalce isnan...
see here

[Lechindianer]

Same problem occurs here with the same architecture. It would be great if this fix would get merged into master. @icecity96: Could you please reopen the issue to fix this issue for all? :)

The isnan <-> std::isnan problem exists in 2 files: cocos/2d/CCActionCamera.cpp and extensions/GUI/CCControlExtension/CCControlUtils.cpp

[icecity96]

I really want to fix it.But if I just simply using std::isnan replace isnan will cause some problem on windows(window doesn't have std::isnan,just isnan).So If you use linux, the following command might help you.

$ cd cocos2d-x
$ sed -i 's/isnan/std::isnan/g' `grep "isnan" -rl`

And I think this could be written in CMakefile in some way(I hope, I am not very familiar with CMake) @Lechindianer

[minggo]

Cocos2d-x will only test on Ubuntu, but we accept PR that fix the issue and will not affect other platforms.

[gelldur]

@minggo PR :)

ok not working on windows beacuse of:

cocos/platform/winrt/CCStdC.h:49: #define isnan _isnan

[minggo]

fixed in #15569