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From: "liyd2021 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/106399] New: Wrong debug info for function with nested
 function under O0
Date: Fri, 22 Jul 2022 05:33:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106399

            Bug ID: 106399
           Summary: Wrong debug info for function with nested function
                    under O0
           Product: gcc
           Version: 12.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: liyd2021 at gmail dot com
  Target Milestone: ---

Affected versions:  gcc 11.1.0 (Ubuntu 20.04.2), since gcc 9

The debugger print `a` with a uninitialized value while `a` should be 3 at =
the
breakpoint.

(terminal) $ cat a.c && gcc -g -OO a.c
int foo(int a)
{
        int a2()
        {
                return a * a;
        }
        return a2();
}

int main()
{
        return foo(3) - 9;
}

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

(terminal) $ gdb a.out
(gdb) b foo
Breakpoint 1 at 0x401188: file a.c, line 1.
(gdb) r
Breakpoint 1, foo (a=3D0) at a.c:1   <- **BUG**: a should be 3
1       int foo(int a)=