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[Mathew Hodson <mathew.hodson@xxxxxxxxx>]

** Changed in: gcc-4.8 (Ubuntu)
   Importance: Undecided => Medium

** Changed in: gcc-4.8 (Ubuntu Trusty)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1446828

Title:
  gdb pretty printers do not auto-load on Trusty

Status in gcc-4.8 package in Ubuntu:
  Fix Released
Status in gcc-4.8 source package in Trusty:
  Fix Committed

Bug description:
  On Ubuntu 14.04.2 (Trusty), the file in libstdc++6-4.8-dbg to auto-
  load the pretty printers doesn't resolve the right path to the
  printers. To reproduce, on a fresh install:

  $ cat test.cpp
  #include <vector>
  int main() {
    std::vector<int> v;
    v.push_back(1);
    return 0;
  }
  $ g++ test.cpp -g
  $ gdb a.out -ex start
  Reading symbols from a.out...done.
  Temporary breakpoint 1 at 0x400956: file test.cpp, line 3.
  Starting program: /home/emaisin/a.out 
  Traceback (most recent call last):
    File "/usr/lib/debug/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19-gdb.py", line 63, in <module>
      from libstdcxx.v6.printers import register_libstdcxx_printers
  ImportError: No module named 'libstdcxx'

  Temporary breakpoint 1, main () at test.cpp:3
  3	  std::vector<int> v;
  (gdb) 

  It seems like the fixup for multiarch actually adds an extra "..":

      if not os.path.basename(os.path.dirname(__file__)).startswith('lib'):
          backdirs += 1 # multiarch subdir

  Removing these two lines almost makes it work:

  $ gdb a.out -ex start
  Reading symbols from a.out...done.
  Temporary breakpoint 1 at 0x400956: file test.cpp, line 3.
  Starting program: /home/emaisin/a.out 
  Traceback (most recent call last):
    File "/usr/lib/debug/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19-gdb.py", line 63, in <module>
      from libstdcxx.v6.printers import register_libstdcxx_printers
    File "/usr/lib/x86_64-linux-gnu/../../share/gcc-4.8/python/libstdcxx/v6/printers.py", line 54
      raise ValueError, "Cannot find type %s::%s" % (str(orig), name)
                      ^
  SyntaxError: invalid syntax

  Temporary breakpoint 1, main () at test.cpp:3
  3	  std::vector<int> v;

  
  That last problem is tracked in bug #1256419, which is still a pending issue in Trusty.

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