From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 0DA2C3858CDA; Mon, 27 Mar 2023 13:34:18 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 0DA2C3858CDA DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1679924058; bh=0KMBHydVC39+L9uye9dBrKhocOAifa1flw2QkC9PqVQ=; h=From:To:Subject:Date:From; b=A2tBra9wzZmT2rrIckPjel058vtcdKfpD0NzMJGuilG8FHbTDJ7ijnui0HkehTxb6 AfsNheCL6Gq0zYKDz8sjDhIM2y4wHpyQitb5uM+CC48czL5T7+j3JOZkA+C0KvNunJ LIpdvo5lcuIhBBp/UXQkFVX6aBa06WYIDQRwgfac= From: "hluaw at connect dot ust.hk" To: gdb-prs@sourceware.org Subject: [Bug gdb/30278] New: gdb gives wrong value at -O1 Date: Mon, 27 Mar 2023 13:34:17 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gdb X-Bugzilla-Component: gdb X-Bugzilla-Version: HEAD X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: hluaw at connect dot ust.hk X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: P2 X-Bugzilla-Assigned-To: unassigned at sourceware dot org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status bug_severity priority component assigned_to reporter target_milestone Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://sourceware.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 List-Id: https://sourceware.org/bugzilla/show_bug.cgi?id=3D30278 Bug ID: 30278 Summary: gdb gives wrong value at -O1 Product: gdb Version: HEAD Status: UNCONFIRMED Severity: normal Priority: P2 Component: gdb Assignee: unassigned at sourceware dot org Reporter: hluaw at connect dot ust.hk Target Milestone: --- Environment: $ gcc --version gcc (Gentoo 11.3.1_p20221209 p3) 11.3.1 20221209 Copyright (C) 2021 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. $ gdb --version GNU gdb (GDB) 14.0.50.20230327-git Copyright (C) 2023 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Code: int c ; int func_8() { int i =3D 0; for (; i < 8; i++) ; if ((c =3D 0)) ; return c; } int main() { func_8(); } Command to reproduce: b func_8 r p i gdb Output: func_8 () at r.c:6 6 if ((c =3D 0)) (gdb) p i $1 =3D 0 Expected result is `i =3D 8`, which happens right after line 6. I tend to think gdb should report `i =3D 8` at line 6 instead of line 8. In fact, when the for-loop is followed by other statement rather than the if here, gdb can correctly report `i =3D 8` on line 6. --=20 You are receiving this mail because: You are on the CC list for the bug.=