Re: C++ in gnuplot

[Mojca M. <moj...@gm...>]

On 10 December 2015 at 09:40, Jun T. wrote:
> On 2015/12/09, at 19:41, Mojca Miklavec wrote:
>> qtterminal/qt_conversion.cpp:129:9: error: use of undeclared
>> identifier 'isnan'; did you mean 'std::isnan'?
>>                                if (isnan(*image))
>>                                    ^~~~~
>>                                    std::isnan
>>
>> which I can fix by changing isnan to std::isnan,
>
> If I set
>     export CC=clang CXX=clang++
>     export CXXFLAGS='-std=c++11 -stdlib=libc++'
> then I don't need to modify any source files (OS X 10.8, Qt5).
>
> Do you get the isnan error even with this CXXFLAGS?

Probably not. I also don't get that error if I link against Qt 4. But
if I use libc++ (which I might have to do eventually), I also need
properly compiled wxWidgets (and hopefully nothing else).

So I would like to understand whether I *need to* use libc++ or not.
Most probably I will have to, but I'm not yet 100% sure.

(Just to make it clear: I'm not trying to solve my own problem. I need
to fix this inside a package manage that provides gnuplot, so it has
to work for everyone.)

The other question is whether adding "std::" prefix would break the
functionality for someone else.

> BTW, how did you install Qt5?

With MacPorts. (And I have no alternative [other than maybe fixing Qt5
in MacPorts] because I'm packaging gnuplot for that.)

Mojca