Dealing with target variance

[Joseph Myers]

My preference is one file per property (or at most, group of extremely 
closely related properties), with sysdeps overrides in the usual fashion.  
That's what we do for a range of libm properties - consider 
nan-high-order-bit.h (overrides for hppa and mips), 
math-tests-trap-force.h (overrides for powerpc), 
fix-fp-int-convert-overflow.h (overrides for arm, csky, mips, s390), etc., 
and it's easy to use a single "find" command to see what architectures 
override a given header.

-- 
Joseph S. Myers
joseph@codesourcery.com