bits/mathdef.h cleanup, revisited

[Joseph S. Myers]

On Tue, 31 Jan 2012, Paul Eggert wrote:

> How about the following idea instead?  It switches based on
> __FLT_EVAL_METHOD__, not on __GNUC__, which gives GCC (and other compilers)
> a way to communicate to glibc how floating-point computation works.
> (I have not tested this.)

With __FLT_EVAL_METHOD__ maybe we could split this header into an 
architecture-independent header and an architecture-dependent header which 
most architectures don't need special versions of at all.  There's not 
much that really needs to be different between architectures and in 
general reducing the number of different copies of a header seems like a 
good idea.

(I've previously noted that sys/epoll.h, sys/eventfd.h, sys/inotify.h, 
sys/signalfd.h, sys/timerfd.h ought to have bits/ headers with the 
architecture-specific parts and only one copy of the main headers.  I also 
think the Linux version of bits/fcntl.h is a good candidate for separating 
the parts shared by all Linux architectures from the architecture-specific 
parts.)

-- 
Joseph S. Myers
joseph@codesourcery.com