test_gdb failures on os x 10.9.2

[samkimbrel]

BPO	21263
Nosy	@ronaldoussoren, @ned-deily, @davidmalcolm, @lysnikolaou, @vyas45
PRs	bpo-21263: Skip test_gdb when python has been compiled with LLVM clang #10318 [3.7] bpo-21263: Skip test_gdb when python has been compiled with LLVM clang (GH-10318) #10325 [3.6] bpo-21263: Skip test_gdb when python has been compiled with LLVM clang (GH-10318) #10326

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2018-11-04.21:42:41.641>
created_at = <Date 2014-04-16.18:50:57.406>
labels = ['easy', '3.8', '3.7', 'tests']
title = 'test_gdb failures on os x 10.9.2'
updated_at = <Date 2018-11-04.21:42:41.638>
user = 'https://bugs.python.org/samkimbrel'

bugs.python.org fields:

activity = <Date 2018-11-04.21:42:41.638>
actor = 'ned.deily'
assignee = 'none'
closed = True
closed_date = <Date 2018-11-04.21:42:41.641>
closer = 'ned.deily'
components = ['Tests']
creation = <Date 2014-04-16.18:50:57.406>
creator = 'sam.kimbrel'
dependencies = []
files = []
hgrepos = []
issue_num = 21263
keywords = ['patch', 'easy']
message_count = 9.0
messages = ['216551', '216577', '259761', '304402', '328767', '329259', '329261', '329262', '329263']
nosy_count = 7.0
nosy_names = ['ronaldoussoren', 'ned.deily', 'dmalcolm', 'sam.kimbrel', 'Bryce Miller', 'lys.nikolaou', 'vyas45']
pr_nums = ['10318', '10325', '10326']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue21263'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']

[samkimbrel]

test_gdb fails under OS X 10.9.2 and gdb 7.6.1 (built with homebrew on Apple LLVM version 5.1 (clang-503.0.40)):

FAIL: test_pycfunction (test.test_gdb.PyBtTests)
Verify that "py-bt" displays invocations of PyCFunction instances
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/Users/skimbrel/cpython/Lib/test/test_gdb.py", line 789, in test_pycfunction
    cmds_after_breakpoint=['bt', 'py-bt'],
  File "/Users/skimbrel/cpython/Lib/test/test_gdb.py", line 182, in get_stack_trace
    self.assertEqual(unexpected_errlines, [])
AssertionError: Lists differ: ['No stack.', "Python Exception <class 'gd[109 chars]ed.'] != []

First list contains 3 additional elements.
First extra element 0:
No stack.

+ []
- ['No stack.',
-  "Python Exception <class 'gdb.error'> No frame is currently selected.: ",
-  'Error occurred in Python command: No frame is currently selected.']

======================================================================
FAIL: test_threads (test.test_gdb.PyBtTests)
Verify that "py-bt" indicates threads that are waiting for the GIL
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/Users/skimbrel/cpython/Lib/test/test_gdb.py", line 736, in test_threads
    self.assertIn('Waiting for the GIL', gdb_output)
AssertionError: 'Waiting for the GIL' not found in 'Breakpoint 1 at 0x1001c78f0: file Python/bltinmodule.c, line 991.\n[New Thread 0x170b of process 41733]\n[New Thread 0x1803 of process 41733]\n[New Thread 0x1903 of process 41733]\n[New Thread 0x1a03 of process 41733]\n\nBreakpoint 1, builtin_id (self=<module at remote 0x100603358>, v=42) at Python/bltinmodule.c:991\n991\t    return PyLong_FromVoidPtr(v);\n\nThread 5 (Thread 0x1a03 of process 41733):\nTraceback (most recent call first):\n\nThread 4 (Thread 0x1903 of process 41733):\nTraceback (most recent call first):\n\nThread 3 (Thread 0x1803 of process 41733):\nTraceback (most recent call first):\n\nThread 2 (Thread 0x170b of process 41733):\nTraceback (most recent call first):\n\nThread 1 (Thread 0x1503 of process 41733):\nTraceback (most recent call first):\n  File "<string>", line 18, in <module>\n'

---

Ran 45 tests in 19.277s

FAILED (failures=2)

[ned-deily]

Since Apple no longer ships gdb or GNU gcc as part of Xcode and since lldb is the native debugger for clang/LLVM, this test is usually skipped on OS X these days unless you go to the trouble of explicitly installing gdb. Does anyone know if python support works when using gdb with clang?

[ned-deily]

See also duplicate bpo-25992. Unless someone has a better idea, I suggest we just disable test_gdb on OS X or, somewhat more precisely, when Python has been compiled with LLVM clang.

[vyas45]

Hi ! I am willing to take a look into this. I am pretty new to the community and would appreciate some pointers relating to the issue which can give me a head-start to resolving it.

Thanks in advance !

[lysnikolaou]

I am trying to create a PR for this and was thinking of somehow updating test.support, in order for someone to be able to find out what compiler was used to build python. Would that make sense?

Also, in case this is indeed something we'd like in test.support, what would be the correct sysconfig variables to read, in order to find that out?

[ned-deily]

New changeset 59668aa by Ned Deily (Lysandros Nikolaou) in branch 'master':
bpo-21263: Skip test_gdb when python has been compiled with LLVM clang (GH-10318)
59668aa

[ned-deily]

New changeset 96fb350 by Ned Deily (Miss Islington (bot)) in branch '3.7':
bpo-21263: Skip test_gdb when python has been compiled with LLVM clang (GH-10318) (GH-10325)
96fb350

[ned-deily]

New changeset f574ce7 by Ned Deily (Miss Islington (bot)) in branch '3.6':
bpo-21263: Skip test_gdb when python has been compiled with LLVM clang (GH-10318) (GH-10326)
f574ce7

[ned-deily]

Thanks, everyone! Fixed for 3.8.0, 3.7.2, and 3.6.8.