This bug was fixed in the package gcc-4.8 - 4.8.5-2ubuntu1
---------------
gcc-4.8 (4.8.5-2ubuntu1) xenial; urgency=medium
* Merge with Debian; remaining changes:
- Build from the upstream source.
gcc-4.8 (4.8.5-2) unstable; urgency=medium
* Update the Linaro support to the 4.8-2015.07 release.
* Adjust setting DH_COMPAT for dh_movefiles with updated debhelper supporting
globbing of arguments. Closes: #800248.
* Fix PR libstdc++/56158, taken from the trunk.
Addresses: #804521. LP: #1514309.
* Backport fixes to allow building with cloog-0.18.4 and isl-0.15.
* Backport PR target/67281 from the trunk (HTM fixes). LP: #1517093.
* Fix auto-loading of gdb pretty printers. LP: #1446828.
-- Matthias Klose <d...@ubuntu.com> Wed, 18 Nov 2015 19:57:42 +0100
** Changed in: gcc-4.8 (Ubuntu)
Status: Confirmed => Fix Released
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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:
Confirmed
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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