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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/94272] [8/9/10 Regression] -fcompare-debug failure
 (length) with -O -fnon-call-exceptions since r8-5241
Date: Mon, 23 Mar 2020 12:39:52 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94272

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |NEW
           Assignee|jakub at gcc dot gnu.org           |unassigned at gcc d=
ot gnu.org

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I'm afraid this is similar to the PR93786 and I don't have a good solution.
This goes wrong during gimplification, we have:
if (c !=3D 0B && d !=3D 0)
  {
    (void) 0;
  }
else
  {
    # DEBUG BEGIN STMT;
    if (*e !=3D 0) (void) 0;
  }
When we call shortcut_cond_expr, the important difference is that without -=
g,
TREE_SIDE_EFFECTS on else_ (which is in that case a COND_EXPR) is false, but
with -g it is true (else_ is a STATEMENT_LIST with TREE_SIDE_EFFECTS set
containing the DEBUG_BEGIN_STMT with TREE_SIDE_EFFECTS false and the COND_E=
XPR
also with TREE_SIDE_EFFECTS clear.

Alex?=