HYPRE blas build error with VS 2015 - c++

Question

I installed VS 2015 Professional. I installed the latest HYPRE, from the Lawrence Livermore website. I then configured it using CMake and proceeded to build, and I started getting BLAS (dnrm2.c) build errors:
2> dnrm2.c
2> 1>
C:\Program Files (x86)\Windows Kits\10\Include\10.0.10240.0\ucrt\math.h(454): error C2059: syntax error: '('
The line of code triggering the error in dnrm2.c is:
#include "math.h"
which points to the file:
c:\Program Files (x86)\Windows Kits\10\Include\10.0.10240.0\ucrt\math.h
I looked up this error and found some suggestions such as this to change the include to:
#include <cmath>
and to edit the HYPRE project settings in: Configuration > C/C++ > Advanced > Compile As to Compile As C++ (/TP)
which I did, but I still see same error, since apparently the same header path to math.h is included from cmath as well:
#else /* _STD_USING */
#include <math.h>
#endif /* _STD_USING */
I've even tried re-installing VS 2015 without any luck (same errors). Appreciate any ideas on what's going on here, and how to resolve this. I guess I could try a minimalist example in VS 2015 that includes the math.h and report back, if that helps.
EDIT
My minimalist example:
#include "math.h"
int main() {
double d1 = sqrt(4.0);
float d2 = abs(4.0);
return 0;
}
appears to be building OK. I tried to set the project the same way to Compile as C (or C++, didn't matter). This doesn't really help me though.

Answer 1

OK, the problem here is with HYPRE source it looks like. They have this in a file f2c.h included before including the math.h:
//#undef abs
//#define abs(x) ((x) >= 0 ? (x) : -(x))
//#endif
When I commented it out (since this is already defined in the standard), then it gets past that build error. Of course I run into other build errors. I'm trying to tackle those separately.
EDIT: It's not as simple as that because they (HYPRE) actually rely on their own definition of abs. So I had undo the above and change the order of some includes so that the undef actually made sense. Either way, this is a HYPRE source code problem.

Answer 2

If you succeed in compiling the HYPRE on VS2015, Could you send your VS2015 program to me!
My major is Geophysics modeling and inversion.
MY email is schoolhui#hotmail.com
Thank you very much!

Answer 3

I've just commented
_Check_return_ int __cdecl abs(_In_ int _X);
in
c:\Program Files (x86)\Windows Kits\10\Include\10.0.10240.0\ucrt\math.h
and then HYPRE was successfully compiled!
Then, I've uncommented "abs".