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From: "080ariel at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug analyzer/110285] New: -Wanalyzer-infinite-loop false positive.
Date: Fri, 16 Jun 2023 14:02:45 +0000
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X-Bugzilla-Version: 14.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110285

            Bug ID: 110285
           Summary: -Wanalyzer-infinite-loop false positive.
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: analyzer
          Assignee: dmalcolm at gcc dot gnu.org
          Reporter: 080ariel at gmail dot com
  Target Milestone: ---

Created attachment 55346
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D55346&action=3Dedit
Preprocessed file of a-test1.i

-Wanalyzer-infinite-loop reports a false positive in test1.c with -O0 -O1 -=
O2
but not with -O3.
-Wanalyzer-infinite-loop reports a false positive in test2.c only with -O3.

Small changes fix the bug or change it from happening only=20
in -O3 to happening only in the others levels and vice-versa.
It is why I have not been able to make test2.c minimal while
keeping the bug in -O3(it is attached just to show it can=20
also happen in -O3).

It does not realize it cannot recurse because the condition=20
to recurse is both condition_to_recurse and !condition_to_recurse.=20

The analyzer report exactly the same thing in 14.0.0 and in 13.1.1.

----------------------------------------------------------------------

Tested both in 13.1.1 and in 14.0.0(commit:
b6cb10af12cf869c1ae348c0e5cb2d364ef0abce) in Linux.
Options given when GCC was configured/built: ../configure --enable-language=
s=3Dc
Complete command line that triggers the bug: gcc -fanalyzer minimalcase.c=