[Bug math/6787] New: exp10() does not consistently set errno

["mtk dot manpages at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

exp10() correctly raises exceptions for overflow and underflow.  However, errno
is only set to ERANGE for the overflow case.  For underflow, it is not set.  It
should also be set to ERANGE in the latter case.

Note also that exp10() is inconsistent with exp2() and exp(), both of which
always set errno for bother underflow and overflow.

Background: 
On error, many glibc math functions both set errno and raise an exception
(fetestexcept(3)).  For example, the following  function all do this: acos(),
asin(), cosh(), sinh(), acosh(), asinh(), exp(), exp2(), ldexp(), log(),
log10(), log2().  However, there is much inconsistency.  Some functions raise an
exception, but don't set errno.  Some functions set errno for some errors, but
not others.  A few set errno, but don't raise an exception.  This series of bug
reports documents deviations from what I consider the ideal: all functions
should BOTH set errno AND raise an exception for all errors.

All of these reports relate to tests on glibc 2.8 (as provided by SUSE 11.0).

-- 
           Summary: exp10() does not consistently set errno
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
        AssignedTo: aj at suse dot de
        ReportedBy: mtk dot manpages at gmail dot com
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=6787

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