https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87253
Bug ID: 87253 Summary: Python test_ctypes fails when built with gcc 8.2 Product: gcc Version: 8.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: kugan at gcc dot gnu.org Target Milestone: --- Python-2.7.15 Steps to reproduce error In Python src directory: ./configure make ./python Lib/test/regrtest.py -v test_ctypes ====================================================================== FAIL: test_struct_by_value (ctypes.test.test_win32.Structures) ---------------------------------------------------------------------- Traceback (most recent call last): File "/home/kugan.vivekanandarajah/Python-2.7.15/Lib/ctypes/test/test_win32.py", line 113, in test_struct_by_value self.assertEqual(ret.left, left.value) AssertionError: -200 != 10 gdb ./python b ReturnRect r Lib/test/regrtest.py -v test_ctypesQuit (gdb) p cp $9 = {x = 15, y = 25} (gdb) p fp $10 = {x = 548534164448, y = 9890688} cp and fp are the same as can be seen from below: vi /home/kugan.vivekanandarajah/Python-2.7.15/Lib/ctypes/test/test_win32.py +112 pt = POINT(15, 25) ... ReturnRect = dll.ReturnRect ReturnRect.argtypes = [c_int, RECT, POINTER(RECT), POINT, RECT, POINTER(RECT), POINT, RECT] .... ret = ReturnRect(i, rect, pointer(rect), pt, rect, byref(rect), pt, rect) gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/home/kugan.vivekanandarajah/install/usr/local/bin/../libexec/gcc/aarch64-unknown-linux-gnu/8.2.1/lto-wrapper Target: aarch64-unknown-linux-gnu Configured with: ../gcc/configure --disable-bootstrap Thread model: posix gcc version 8.2.1 20180907 (GCC)