I think the workaround is supposed to look like this: #define _GLIBCPP_USE_C99 1 #include <cmath> #undef _GLIBCPP_USE_C99 #include <iostream>
using __gnu_cxx::isnan;
I thought I had tried that, but I was not sure. So I tried again this morming, and it definitely does not work on MacOS X. The problem being that the undefs in cmath are unconditional.
I presume it works on Linux because isnan is a function.
Bill Northcott
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