From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <sourceware-bugzilla@sourceware.org>
Received: by sourceware.org (Postfix, from userid 48)
	id 37ED339E1E35; Mon, 19 Dec 2022 06:27:47 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 37ED339E1E35
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org;
	s=default; t=1671431269;
	bh=agG21nPiRWjWIlZ3hwSefS4AXsoAMKK4wh9BsbkdJdM=;
	h=From:To:Subject:Date:From;
	b=jEZTzNvLnCQbZgbrhbt1Sm+4yyBhchamz/TucjDkdfKfaTFTbSIapG6sazlTcdJrf
	 kD33mSdl7CoJ024Midt62xIATQ900oEi6r9EZh0D1hndn+IWtE05b7sF7jWbkrwaUL
	 iREkvMuIl4uKYhfO0H4Kkj+TtFkdcEXeZhtZ0xZo=
From: "vimacs.hacks at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug c++/29918] New: GDB cannot step or break into template
 functions compiled with g++ -Og
Date: Mon, 19 Dec 2022 06:27:47 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gdb
X-Bugzilla-Component: c++
X-Bugzilla-Version: 12.1
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: vimacs.hacks at gmail dot com
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: <bug-29918-4717@http.sourceware.org/bugzilla/>
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: <gdb-prs.sourceware.org>

https://sourceware.org/bugzilla/show_bug.cgi?id=3D29918

            Bug ID: 29918
           Summary: GDB cannot step or break into template functions
                    compiled with g++ -Og
           Product: gdb
           Version: 12.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
          Assignee: unassigned at sourceware dot org
          Reporter: vimacs.hacks at gmail dot com
  Target Milestone: ---

This is another issue posted on
https://sourceware.org/pipermail/gdb/2022-November/050431.html

For the following C++ code, I find that GDB (both 12.1 and
gdb-13-branchpoint-5-g2a517ca94d3) cannot step or break into C++ template
function t0<int> compiled with g++ -Og (GCC version 12.2.0), while LLDB from
LLVM 14.0.6 can step into this function:

template <typename T =3D int>
int t0(int n)
{
     int sum =3D 0;
     for (int i =3D 0; i < n; ++i) {
         sum +=3D i * i;
     }
     return sum;
}

int t1(int n)
{
     int sum =3D 0;
     for (int i =3D 0; i < n; ++i) {
         sum +=3D i * i;
     }
     return sum;
}

int main()
{
     int a =3D t0(5);
     int b =3D t1(5);
     return a + b;
}

The behavior in GDB looks like this:

Breakpoint 1, main () at template_func.cc:21
21      {
(gdb) n
22           int a =3D t0(5);
(gdb) s
t0<int> (n=3Dn@entry=3D5) at template_func.cc:2
2       int t0(int n)
(gdb)=20
main () at template_func.cc:23
23           int b =3D t1(5);
(gdb)=20

The assembly output of "g++-g -Og" and "g++ -g -O0" are both attached in the
attachment of the following comments, which can be assembled and reproduce =
this
issue.

--=20
You are receiving this mail because:
You are on the CC list for the bug.=