I was curious if this is intentional. I found that traditionally __STDC_IEC_559__ is defined in glibc and then used by gcc. Cygwin doesn't use glibc however, and I was wondering if __STDC_IEC_559__ isn't defined by newlib for whatever reason or if it is merely a problem on my end.

I understand that all compilers/libraries do not define __STDC_IEC_559__ as they are not all compliant with the standard, I am just trying to figure out why the libraries used by cygwin specifically are not.