https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95098
Bug ID: 95098
Summary: Out of scope variable visible during debugging at Og
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
Assignee: unassigned at gcc dot gnu.org
Reporter: massarelli at diag dot uniroma1.it
Target Milestone: ---
Variable l_9 is visible when the debugger hit line 4.
$ cat a.c
int g_2, a;
int b() {
char l_10;
for (g_2 = 21; (g_2 < (-27)); g_2 = 0)
return g_2;
{
int *l_9 = &a;
return;
}
}
int main() { b(); }
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/local/bin/../libexec/gcc/x86_64-pc-linux-gnu/11.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ./configure --prefix=/tmp/gcc_build --disable-multilib
--enable-languages=c,c++
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 11.0.0 20200508 (experimental) (GCC)
$ lldb -v
lldb version 11.0.0
clang revision 23cbea9a04e023d5b79dfee5964fae769340c993
llvm revision 23cbea9a04e023d5b79dfee5964fae769340c993
$ gcc -Og -g -o opt a.c
$ lldb opt
(lldb) target create "opt"
Current executable set to 'opt' (x86_64).
(lldb) b main
Breakpoint 1: where = opt`main at a.c:11:14, address = 0x000000000040048d
(lldb) r
Process 61 launched: 'opt' (x86_64)
Process 61 stopped
* thread #1, name = 'opt', stop reason = breakpoint 1.1
frame #0: 0x000000000040048d opt`main at a.c:11:14
8 return;
9 }
10 }
-> 11 int main() { b(); }
(lldb) s
Process 61 stopped
* thread #1, name = 'opt', stop reason = step in
frame #0: 0x0000000000400482 opt`b at a.c:4:12
1 int g_2, a;
2 int b() {
3 char l_10;
-> 4 for (g_2 = 21; (g_2 < (-27)); g_2 = 0)
5 return g_2;
6 {
7 int *l_9 = &a;
(lldb) frame var -s -g
LOCAL: (char) l_10 = <no location, value may have been optimized out>
STATIC: (int *) l_9 = 0x000000000060102c
GLOBAL: (int) g_2 = 0
GLOBAL: (int) a = 0
