alt Hacker NewsThere's platform and there's platform. I assume a POSIX platform, so I don't need to check for CHAR_BIT. My code won't work on some DSP with 64-bit chars, and I don't care enough to write that check.
Many of the tests I did back in the 1990s seem pointless now. Do you have checks for non-IEEE 754 math?
Well, last year clang did not define __STDC_IEC_559__, so assuming IEEE-754 math with most C compilers is a bad idea.