json.hpp:15372:22: error: expected unqualified-id if (not std::isfinite(x)): Started getting this bug after updating my XCode

[sarahaguasvivas]

[macOS Catalina]

Hi all,

I started getting the following bug after I upgraded my os to OS Catalina and also the version of XCode:

nlohmann_json/single_include/nlohmann/json.hpp:15372:22: error: 
      expected unqualified-id
        if (not std::isfinite(x))
                     ^
/usr/local/include/math.h:155:5: note: expanded from macro 'isfinite'
    ( sizeof(x) == sizeof(float)  ? __inline_isfinitef((float)(x))       \
    ^

I tried: xcode-select --install and also running my cmake file with additional flags. Let me know what I can do to fix this.

[nlohmann]

Which other headers did you include?

[sarahaguasvivas]

Hi,

Here are the headers I have that are not specific to my package are iostream, string, utility , map, vector, sstream. I'm also using another third party software to parse HDF5.

This used to not be a problem until after I updated Xcode.

Cheers

[nlohmann]

Can you please check whether the error persists if you include json.hpp first? Quick googling of the error, I found some issues related to including some math header that yield collisions.

[sarahaguasvivas]

Hi,

Thanks for the quick response. I believe it persists if I include it before the rest. From this Stack Overflow Issue I found that it is possible that my Xcode is corrupted. I will try re-installing it and get back to you as soon as I see the results.

[sarahaguasvivas]

Hi,

I solved this issue. It was an issue with <cmath>. These were my steps towards solving it. There might be a better way but this worked for me:

1. Removed /usr/local/include
2. Installed boost using home-brew
3. Compiled my package using cmake .. -DBOOST_ROOT="/usr/local/Cellar/boost/1.72.0_1/" -DBOOST_LIBRARYDIR="/usr/local/Cellar/boost/1.72.0_1/" ..

Thanks for the support