[Bug 1258642] Re: gdb: Python 3 incompatible with libstdc++ pretty printers.

[Martin Olsson]

I have the same for trivial hello world program written in go

go build prog.go
gdb prog

  File "/usr/share/go/src/pkg/runtime/runtime-gdb.py", line 358
    print s, ptr['goid'], "%8s" % sts[long((ptr['status']))], blk.function
          ^
SyntaxError: invalid syntax

---

When gdb is switched to use python3 in plugins, then the packaged
plugins need to be updated correspondingly as well. Please don't just
switch it in gdb and leave stuff like C++ and go pretty printing
packages broken.

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https://bugs.launchpad.net/bugs/1258642

Title:
  gdb: Python 3 incompatible with libstdc++ pretty printers.

Status in “gdb” package in Ubuntu:
  Confirmed

Bug description:
  gdb is now linked against python 3 but python 3 is incompatible with
  libstdc++'s pretty printers:

  Traceback (most recent call last):
    File "<string>", line 4, in <module>
    File "/usr/share/gcc-4.8/python/libstdcxx/v6/printers.py", line 54
      raise ValueError, "Cannot find type %s::%s" % (str(orig), name)
                      ^
  SyntaxError: invalid syntax
  /home/ruediger/.gdbinit:7: Error in sourced command file:
  Error while executing Python code.

  There is a proposed patch but it wasn't upstreamed yet: http://www
  .mail-archive.com/gcc-patches at gcc.gnu.org/msg65185.html

  I'd propose either to continue using python2 for gdb, fixing the
  details to get the patch upstream, or use a patched version downstream
  for now.

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