Re: [Emacs-diffs] master 1d2df2f: Improve bignum comparison

[Paul Eggert]

Eli Zaretskii wrote:
> This commit does this:
>
>      * src/data.c (isnan): Remove, as we can assume C99.
>
> We indeed assume a C99 compliant compiler, but not necessarily a C99
> compliant library.  Does the above assumption still valid if the
> library is not C99-compliant?

Other parts of Emacs have been assuming isnan since July, so this should be safe 
here.

In practice isnan support is universal nowadays in the non-Microsoft world, and 
even MSVC has it, as I understand it. If there are problems (when compiling for 
MS-Windows 95, say?) we can fix them by doing something like adding "#define 
isnan _isnan" in src/w32.h. It's better to isolate portability hacks to 
platform-specific code, when the problem is platform-specific.