ada/6476: Need configury bits to detect binutils eh_frame optimizer bugs

[davem@redhat.com]

>Number:         6476
>Category:       ada
>Synopsis:       Need configury bits to detect binutils eh_frame optimizer bugs
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Apr 26 04:56:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     davem@redhat.com
>Release:        gcc-3.1 CVS
>Organization:
>Environment:
sparc-linux, sparc-sun-solaris*, etc.
>Description:
Several eh_frame optimization bugs have been discovered
in binutils.  They are fixed in current CVS, but at
3.1 release time there will not be a released binutils
containing these fixes.

Frame unwinding is not reliable without these fixes.
>How-To-Repeat:
Build current CVS 3.1 on a Sparc target with currently
released binutils.  Most testsuite failures will be due
to the eh_frame being wrong.
>Fix:
Implement configure bits to detect binutils with the
problem, and disable using eh_frame optimizations
if so.
>Release-Note:
>Audit-Trail:
>Unformatted: