[Bug middle-end/30555] New: GCC should know about errno

["rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

On systems where possible, GCC should get knowledge about the errno location so
it can clobber the right memory location for calls only setting errno.

On glibc the errno location is obtained using a call to the __errno_location ()
library function, so the obvious thing would be to introduce
__builtin_errno_location () on this (or similar) system(s) and teach aliasing
the special property of its return value and its relation to errno setting
functions.


-- 
           Summary: GCC should know about errno
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rguenth at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30555