Sigh. Yeah, I've researched a bit why that happens. The story is this:
glibc wanted to have isinf work with double AND float etc without conversion. Therefore, there is a special gcc construct where you can find out what type a parameter is IN A MACRO. Therefore, in C, isnan is a macro and so is isinf. The include file defining it is <math.h> However, in C++ there's a include file <cmath>. This one provides normal functions in the namespace "std" (since overloads are possible in C++). dmd2 undefs isinf which is why the C version doesn't work anymore (that's stupid, really. What were they thinking?). But then they dont use the namespace std so it won't use that one either. "::isinf" is DEFINITELY wrong - no idea how that ever worked. It won't find the macro that way AND it won't find the function in namespace std either (since <nothing>:: definitely says you want the one without namespace). Some LLVM versions include <cmath> somewhere in their header files - so dmd2 is forced to use cmath rather than math.h even though they *want* to use math.h and the source code says so. Therefore, I now use the C++ std::isinf - I hope LLVM won't change their mind again because then it will break again.
