symtab/893: -feliminate-dwarf2-dups unusable

[bkoz at redhat dot com]

>Number:         893
>Category:       symtab
>Synopsis:       -feliminate-dwarf2-dups unusable
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Dec 17 15:28:04 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     benjamin kosnik <bkoz@redhat.com>
>Release:        unknown-1.0
>Organization:
>Environment:
linux x86
RH 8.0
RH 7.3
current gcc, src, binutils also dave carlton gdb branch
>Description:
see
http://sources.redhat.com/ml/gdb/2002-12/msg00258.html

in a nutshell: 

I've been experimenting with -gdwarf-2 -feliminate-dwarf2-dups in libstdc++. 
This combination of flags reduces the shared binary by 400k.

-g -O2
-rwxrwxr-x    1 bkoz     bkoz         4.0M libstdc++.so.5.0.2*

-gdwarf-2 -feliminate-dwarf2-dups -O2
-rwxrwxr-x    1 bkoz     bkoz         3.6M libstdc++.so.5.0.2*

The build and testsuite complete without incident, but then when I try to
debug, I get:

(gdb) file a.out
Reading symbols from a.out...DW_FORM_strp pointing outside of .debug_str section

This is with mainline gdb, and the dcarlton branch, with top-of-tree
gcc, on x86/linux.

>How-To-Repeat:
try to debug any C++ program created and linked with -feliminate-dwarf2-dups
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: