[Bug 1178539] [NEW] gdb 7.6 can take tens of seconds to resolve symbols in C++

[Constantine Sapuntzakis]

Public bug reported:

See http://sourceware.org/bugzilla/show_bug.cgi?id=15454
filed by me.

Reverting 677b1bf from the gdb git repository fixes the problem.

In this revision, gdb started searching the base classes for the symbol
too. The algorithm seems to require optimization.

Meanwhile, the problem can be worked with a one-line diff that reverts
the behavior to the pre-677b1bf. Attaching the patch


lsb_release -rd
Description:    Ubuntu 13.04
Release:        13.04

gdb:
  Installed: 7.6~20130417-0ubuntu1
  Candidate: 7.6~20130417-0ubuntu1
  Version table:
 *** 7.6~20130417-0ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ raring/main amd64 Packages
        100 /var/lib/dpkg/status

** Affects: gdb (Ubuntu)
     Importance: Undecided
         Status: New

** Patch added: "Disable base class search"
   https://bugs.launchpad.net/bugs/1178539/+attachment/3671618/+files/gdb-7.6-slow-baseclass-search-disable.diff

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https://bugs.launchpad.net/bugs/1178539

Title:
  gdb 7.6 can take tens of seconds to resolve symbols in C++

Status in “gdb” package in Ubuntu:
  New

Bug description:
  See http://sourceware.org/bugzilla/show_bug.cgi?id=15454
  filed by me.

  Reverting 677b1bf from the gdb git repository fixes the problem.

  In this revision, gdb started searching the base classes for the
  symbol too. The algorithm seems to require optimization.

  Meanwhile, the problem can be worked with a one-line diff that reverts
  the behavior to the pre-677b1bf. Attaching the patch

  
  lsb_release -rd
  Description:    Ubuntu 13.04
  Release:        13.04

  gdb:
    Installed: 7.6~20130417-0ubuntu1
    Candidate: 7.6~20130417-0ubuntu1
    Version table:
   *** 7.6~20130417-0ubuntu1 0
          500 http://us.archive.ubuntu.com/ubuntu/ raring/main amd64 Packages
          100 /var/lib/dpkg/status

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