mingw will not let me call isfinite()

[dtom0352]

Hi All,
I am trying to compile a simple call to isfinite() using the mingw compiler:

line 750: if(!isfinite(link1IntersectionCoeff))

where link1IntersectionCoeff is a double.

I get the error message:
"ExtendedOrbitFunctionConstMfp.cpp": /David/project/ExtendedOrbitFunctionConstMfp.cpp ` at line 750
isfinite' undeclared (first use this function)

However other math.h functions like cos, sin work well.

Any ideas?
Thanks,
David.

[vart]

Probably this functon is not present in your version of the math-library?

[dtom0352]

Is there anything I can do to update it?

[robwhit]

type gcc -v
what's the version?
you could download a newer version, my version of mingw32 has it. (gcc version 3.4.2 (mingw-special))

[dtom0352]

It's gcc-3.2, I will try the new one...

[MacGyver]

Also, not to be a pain, but you're compiling .cpp files, so you're probably writing C++ code, and future enquiries should be in the C++ forums if that is the case. If not, you should rename the files to have .c extensions because some compilers might be "smart" about compiling the code as C or C++ depending upon the file extension.

[dwks]

isfinite() is a C99 function, which means that you'd need a relatively recent math library to use it, as you've discovered. Like MacGyver said, this means that if this source file is C++, you probably won't be able to use this function.