Portable isfinite for gfortran 4.0.3 and ifort 8.1/9.0

Dear gurus

I am looking for an implementation of isfinite that works on the
following three compilers

gfortran 4.0.3, ifort 8.1, and ifort 9.0

I do not use the -fastmath flag when compiling, but I do use the
optimization flags. what is the simplest failproof way to do the test?

Niels

BTW: Is it possible to determine the name of the compiler from inside
the code?

.

Relevant Pages

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