Source file structure for fenv.h support

[Joseph Myers]

On Tue, 30 Jul 2019, Howland, Craig D. - US via newlib wrote:

> (I've never seen a definition allocating where.  POSIX doesn't seem to 
> that I can find.  The Linux man pages do show -lm needed, so past 
> convention is a suitable reason, but I'm curious as to if there is a 
> "standard" that defines the mapping of C and/or POSIX functions to a 
> library name.  I expected to find it in POSIX and was surprised not to.)

It's defined in the POSIX specification for the c99 command.

https://pubs.opengroup.org/onlinepubs/9699919799/utilities/c99.html

-- 
Joseph S. Myers
joseph@codesourcery.com