[Bug libc/14047] strtof gives spurious ERANGE errors

["joseph at codesourcery dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14047

--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> 2012-05-02 10:46:40 UTC ---
It's not clear to me if this should set errno to ERANGE or not.  IEEE 
754-2008 (section 7.5) says:

  In addition, under default exception handling for underflow, if the 
  rounded result is inexact - that is, it differs from what would have been 
  computed were both exponent range and precision unbounded - the underflow 
  flag shall be raised and the inexact (see 7.6) exception shall be 
  signaled. If the rounded result is exact, no flag is raised and no inexact 
  exception is signaled. This is the only case in this standard of an 
  exception signal receiving default handling that does not raise the 
  corresponding flag. Such an underflow signal has no observable effect 
  under default handling.

So does ERANGE for underflow correspond to the underflow exception being 
signaled (in which case errno should be set to ERANGE) or to the flag 
being raised (in which case errno should not be set to ERANGE)?  I'll see 
what the WG14 reflector thinks.

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