libstdc++6-*-dbg doesn't contain gdb Python hook

[Evan Broder]

libstdc++6-4.6-dbg and other -dbg packages for libstdc++ include the new Python pretty printers for debugging STL classes under gdb. However, they don't get loaded automatically, and require manually modifying gdb's python's sys.path.

The gcc-snapshot package contains /usr/lib/gcc-snapshot/lib/libstdc++.so.6.0.17-gdb.py, which causes the pretty printers to get autoloaded whenever gdb attaches to a process that links /usr/lib/gcc-snapshot/lib/libstdc++.so.6.0.17.

libstdc++6-4.6-dbg appears to lack this file (which can go either next to the original library or next to the debug symbols under /usr/lib/debug), as do the -dbg packages for libstdc++ in other gcc versions available.

In the gcc source packages, the gdb autoload file is generated in src/libstdc++-v3/python. The Makefile installs it next to the library, but I can't follow the gcc packaging well enough to suggest a patch for non-snapshot builds.

The pretty printers make a huge difference in debugging C++ code that uses STL containers. It would be very helpful if these were loaded by default for non-snapshot builds of gcc.

For other examples of auto-loaded debugging code, see python2.7-dbg (/usr/lib/debug/usr/lib/libpython2.7.so.1.0-gdb.py) and libglib2.0-dev (/usr/share/gdb/gdb/auto-load/libglib-2.0.so.0.3000.0-gdb.py and libgobject-2.0.so.0.3000.0-gdb.py)

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: libstdc++6-4.6-dbg 4.6.1-9ubuntu3
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
CheckboxSubmission: d27dbc9ce66475289526ca4b283ec487
CheckboxSystem: bb422ca46d02494cdbc459927a98bc2f
Date: Fri Oct 28 13:39:36 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
SourcePackage: gcc-4.6
UpgradeStatus: Upgraded to oneiric on 2011-09-18 (40 days ago)

[Launchpad Janitor (janitor)]

This bug was fixed in the package gcc-4.5 - 4.5.3-10ubuntu1

---------------
gcc-4.5 (4.5.3-10ubuntu1) precise; urgency=low

  * Merge with Debian.

gcc-4.5 (4.5.3-10) unstable; urgency=low

  * Update to SVN 20111206 (r182040) from the gcc-4_5-branch.
    - Fix PR c/50565, PR target/49965, PR target/50464, PR target/50091,
      PR c++/44473, PR fortran/50659, PR fortran/50273, PR target/51393,
      PR debug/48190, PR rtl-optimization/51187, PR target/30282,
      PR target/50979, PR target/50875, R target/50691, PR target/50788,
      PR target/50737, PR c++/50793, PR c++/50618, PR bootstrap/50888,
      PR target/50737.
  * For ARM hard float, set the dynamic linker to
    /lib/arm-linux-gnueabihf/ld-linux.so.3.
  * Install the libstdc++.so-gdb.py file. LP: #883269.
  * Update the Linaro support to the 4.5-2011.12 release.
 -- Matthias Klose <email address hidden> Tue, 06 Dec 2011 13:05:02 +0100

[Matthias Klose (doko)]

not in gcc-4.4

[Launchpad Janitor (janitor)]

This bug was fixed in the package gcc-4.6 - 4.6.2-6ubuntu1

---------------
gcc-4.6 (4.6.2-6ubuntu1) precise; urgency=low

  * Merge with Debian.
  * Linaro GCC 4.6 2011-12 changes not yet in Ubuntu:
    - Generic tuning support for Big-endian platforms.
    - SLP support for operations with arbitrary numbers of operands.
    - SLP support for conditions.
    - Pattern recognition support in basic-block SLP.
    - Enhancements to mixed-size condition pattern recognition.
    - Unaligned block-move support for ARMv7.
    - Added Cortex-A15 integer pipeline tuning.

gcc-4.6 (4.6.2-6) unstable; urgency=low

  * Update to SVN 20111208 (r182120) from the gcc-4_6-branch.
    - Fix PR c++/51265, PR bootstrap/50888, PR target/51393 (ix86),
      PR target/51002 (AVR), PR target/51345 (AVR), PR debug/48190,
      PR fortran/50684, PR fortran/51218, PR target/50906 (closes: #650318),
      PR tree-optimization/51315 (closes: #635126), PR tree-optimization/50622,
      PR fortran/51435, PR debug/51410, PR c/51339, PR rtl-optimization/48721,
      PR middle-end/51323 (LP: #897583), PR middle-end/50074,
      PR middle-end/50074.

  [ Matthias Klose ]
  * Run the libstdc++ testsuite on all architectures again. Closes: #622699.
  * Apply proposed patch for PR target/50906 (powerpcspe only). Closes: #650318.
  * Fix PR target/49030 (ARM), taken from Linaro. Closes: #633479.
  * Fix PR target/50193 (ARM), taken from Linaro. Closes: #642127.
  * Install the libstdc++.so-gdb.py file. LP: #883269.
  * Fix PR c++/50114, backport from trunk. LP: #827806.
  * Merge changes to allow gcc-snapshot cross builds, taken from Linaro.
  * Update the Linaro support to the 4.6 branch.

  [ Marcin Juszkiewicz ]
  * Fix issues with gcc-snapshot cross builds.
  * Allow building Linaro binary packages in a single package.
  * Apply hardening patches for cross builds when enabled for native builds.
 -- Matthias Klose <email address hidden> Thu, 08 Dec 2011 17:17:30 +0100