[GRASS-dev] isnan() in i.atcorr

[Paul Kelly]

i.atcorr uses the isnan() function which seems to cause compilation to 
fail on Windows:

sh-2.04$ make
c++ -I/c/grass/grass7/dist.i686-pc-mingw32/include -I/c/grass/extra/include -O2 -s -I/c/grass/extra/include  -DPACKAGE=\""grassmods"\"   -I/c/grass/grass7/dist.i686-pc-mingw32/include -o OBJ.i686-pc-mingw32/main.o -c main.cpp
main.cpp: In function `void process_raster(int, InputMask, ScaleRange, int, int, int, bool, ScaleRange, bool)':
main.cpp:309: error: `isnan' was not declared in this scope
make: *** [OBJ.i686-pc-mingw32/main.o] Error 1
sh-2.04$

main.cpp includes <cmath>; I wonder if the problem is due to the fact 
isnan() is a C99 function? Should it be changed?

Paul