[Bug symtab/14931] New: GDB fails to read minsyms if debug info reading fails.

[Bug symtab/14931] New: GDB fails to read minsyms if debug info reading fails.

[palves at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14931

             Bug #: 14931
           Summary: GDB fails to read minsyms if debug info reading fails.
           Product: gdb
           Version: 7.0
            Status: NEW
          Severity: normal
          Priority: P2
         Component: symtab
        AssignedTo: unassigned@sourceware.org
        ReportedBy: palves@redhat.com
    Classification: Unclassified


Trying to check gdb's behavior in a previous release, I did:

$ ~/gdb/7_0/build/gdb/gdb -nx ./gdb/gdb
GNU gdb (GDB) 7.0.1.20091231-cvs
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/pedro/gdb/mygit/build/gdb/gdb...Dwarf Error: wrong
version in compilation unit header (is 4, should be 2) [in module
/home/pedro/gdb/mygit/build/gdb/gdb]
(gdb) 

The old GDB didn't understand dwarf 4, so it bailed out, but it also didn't
load the minsyms, while it could.  I think it should:

(gdb) b main
No symbol table is loaded.  Use the "file" command.
Make breakpoint pending on future shared library load? (y or [n]) 

$ nm -A ./gdb/gdb | grep "T main$"
./gdb/gdb:0000000000457b4c T main

I haven't tried current mainline's behavior.

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[Bug symtab/14931] GDB fails to read minsyms if debug info reading fails.

[tromey at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14931

Tom Tromey <tromey at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tromey at redhat dot com
         AssignedTo|unassigned at sourceware    |tromey at redhat dot com
                   |dot org                     |

--- Comment #1 from Tom Tromey <tromey at redhat dot com> 2012-12-19 20:43:21 UTC ---
Testing a patch.

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[Bug symtab/14931] GDB fails to read minsyms if debug info reading fails.

[cvs-commit at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=14931

--- Comment #2 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> 2013-01-14 20:51:54 UTC ---
CVSROOT:    /cvs/src
Module name:    src
Changes by:    tromey@sourceware.org    2013-01-14 20:51:48

Modified files:
    gdb            : ChangeLog dwarf2read.c psympriv.h psymtab.c 
    gdb/testsuite  : ChangeLog 
Added files:
    gdb/testsuite/gdb.dwarf2: dw2-error.S dw2-error.c dw2-error.exp 

Log message:
    PR symtab/14931:
    * psymtab.c (struct psymtab_state): New.
    (discard_psymtabs_upto, make_cleanup_discard_psymtabs): New
    functions.
    * psympriv.h (make_cleanup_discard_psymtabs): Declare.
    * dwarf2read.c (dwarf2_build_psymtabs): Catch exceptions.
    gdb/testsuite
    * gdb.dwarf2/dw2-error.exp: New file.
    * gdb.dwarf2/dw2-error.c: New file.
    * gdb.dwarf2/dw2-error.S: New file.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/ChangeLog.diff?cvsroot=src&r1=1.15014&r2=1.15015
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/dwarf2read.c.diff?cvsroot=src&r1=1.728&r2=1.729
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/psympriv.h.diff?cvsroot=src&r1=1.17&r2=1.18
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/psymtab.c.diff?cvsroot=src&r1=1.60&r2=1.61
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/ChangeLog.diff?cvsroot=src&r1=1.3504&r2=1.3505
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.dwarf2/dw2-error.S.diff?cvsroot=src&r1=NONE&r2=1.1
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.dwarf2/dw2-error.c.diff?cvsroot=src&r1=NONE&r2=1.1
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.dwarf2/dw2-error.exp.diff?cvsroot=src&r1=NONE&r2=1.1

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[Bug symtab/14931] GDB fails to read minsyms if debug info reading fails.

[tromey at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14931

Tom Tromey <tromey at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|---                         |7.6

--- Comment #3 from Tom Tromey <tromey at redhat dot com> 2013-01-14 20:56:02 UTC ---
Fixed.

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