From: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>
Date: Wed, 13 Sep 2023 04:48:44 +0000 (-0700)
Subject: [3.11] gh-104736: Fix test_gdb tests on ppc64le with clang (GH-109360) (#109362)
X-Git-Tag: v3.11.6~94
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=66c0d0ac8c55be9c973be1189b0e9ffcfdfb35a4;p=thirdparty%2FPython%2Fcpython.git

[3.11] gh-104736: Fix test_gdb tests on ppc64le with clang (GH-109360) (#109362)

gh-104736: Fix test_gdb tests on ppc64le with clang (GH-109360)

Fix test_gdb on Python built with LLVM clang 16 on Linux ppc64le (ex:
Fedora 38). Search patterns in gdb "bt" command output to detect
when gdb fails to retrieve the traceback. For example, skip a test if
"Backtrace stopped: frame did not save the PC" is found.
(cherry picked from commit 44d9a71ea246e7c3fb478d9be62c16914be6c545)

Co-authored-by: Victor Stinner <vstinner@python.org>
---

diff --git a/Lib/test/test_gdb.py b/Lib/test/test_gdb.py
index d1f9a03a41fd..5d042a45587a 100644
--- a/Lib/test/test_gdb.py
+++ b/Lib/test/test_gdb.py
@@ -246,6 +246,14 @@ class DebuggerTests(unittest.TestCase):
             # gh-91960: On Python built with "clang -Og", gdb gets
             # "frame=<optimized out>" for _PyEval_EvalFrameDefault() parameter
             '(unable to read python frame information)',
+            # gh-104736: On Python built with "clang -Og" on ppc64le,
+            # "py-bt" displays a truncated or not traceback, but "where"
+            # logs this error message:
+            'Backtrace stopped: frame did not save the PC',
+            # gh-104736: When "bt" command displays something like:
+            # "#1  0x0000000000000000 in ?? ()", the traceback is likely
+            # truncated or wrong.
+            ' ?? ()',
         ):
             if pattern in out:
                 raise unittest.SkipTest(f"{pattern!r} found in gdb output")
diff --git a/Misc/NEWS.d/next/Tests/2023-09-13-05-58-09.gh-issue-104736.lA25Fu.rst b/Misc/NEWS.d/next/Tests/2023-09-13-05-58-09.gh-issue-104736.lA25Fu.rst
new file mode 100644
index 000000000000..85c370fc87ac
--- /dev/null
+++ b/Misc/NEWS.d/next/Tests/2023-09-13-05-58-09.gh-issue-104736.lA25Fu.rst
@@ -0,0 +1,4 @@
+Fix test_gdb on Python built with LLVM clang 16 on Linux ppc64le (ex: Fedora
+38). Search patterns in gdb "bt" command output to detect when gdb fails to
+retrieve the traceback. For example, skip a test if ``Backtrace stopped: frame
+did not save the PC`` is found. Patch by Victor Stinner.