[issue20932] Undefined behavior flagged by Clang 3.4 (Python 3.5 from hg)

Martin Panter added the comment: Serhiy’s patch does fix about half the errors (1 whole screenful reduces to a bit over 1/2 a screenful). I do find it a bit ugly though (four casts in the one term of a macro!). -- ___ Python tracker

[issue20932] Undefined behavior flagged by Clang 3.4 (Python 3.5 from hg)

Changes by Serhiy Storchaka : -- nosy: +martin.panter ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe: https://m

[issue20932] Undefined behavior flagged by Clang 3.4 (Python 3.5 from hg)

Benjamin Peterson added the comment: No, it still gives /home/benjamin/dev/python/3.4/Modules/audioop.c:1811:9: runtime error: left shift of negative value -22 /home/benjamin/dev/python/3.4/Modules/audioop.c:1811:9: runtime error: left shift of negative value -22 /home/benjamin/dev/python/3.4/

[issue20932] Undefined behavior flagged by Clang 3.4 (Python 3.5 from hg)

Serhiy Storchaka added the comment: Please try this patch. Perhaps it fixes audioop issues. -- keywords: +patch nosy: +serhiy.storchaka Added file: http://bugs.python.org/file34493/audioop_signed_left_shift.patch ___ Python tracker

[issue20932] Undefined behavior flagged by Clang 3.4 (Python 3.5 from hg)

Jeffrey Walton added the comment: Here's another one I missed. The first is a problem due to silent truncation when casting from the double 3.40282e+38 to a float (or Clang is wrong). [ 10/389] test_struct /home/jwalton/Desktop/cpython-checkout/Objects/floatobject.c:2028: runtime error: value

[issue20932] Undefined behavior flagged by Clang 3.4 (Python 3.5 from hg)

Jeffrey Walton added the comment: > This is just the same as #20929, I believe? I think most of the issues in the 20929 report (Python 3.4-RC3) are present in this report. But under this report, I can re-test as you check in the fixes. (Python 3.4-RC3 is fixed in time from my perspective). --

[issue20932] Undefined behavior flagged by Clang 3.4 (Python 3.5 from hg)

Jeffrey Walton added the comment: Pulled the latest after BP cleared some more runtime errors: $ hg summary parent: 89662:7ce22d0899e4 tip merge 3.3 branch: default commit: 2 modified update: (current) Misaligned accesses dominate with over 11K: $ cat python-3.5-make-test.txt |

[issue20932] Undefined behavior flagged by Clang 3.4 (Python 3.5 from hg)

Benjamin Peterson added the comment: This is just the same as #20929, I believe? -- nosy: +benjamin.peterson ___ Python tracker ___ __

[issue20932] Undefined behavior flagged by Clang 3.4 (Python 3.5 from hg)

Changes by Jeffrey Walton : Added file: http://bugs.python.org/file34429/python-3.5-make-test.txt ___ Python tracker ___ ___ Python-bugs-list

[issue20932] Undefined behavior flagged by Clang 3.4 (Python 3.5 from hg)

New submission from Jeffrey Walton: Checked out Python-3.5 from mercurial. Compiled with Clang 3.4, added -fsanitzie=undefined to CFLAGS. Ran 'make' and 'make check'. A few issues during `make`: Objects/longobject.c:40:42: runtime error: index -3 out of bounds for type 'PyLongObject [262]' Ob