https://bugs.llvm.org/show_bug.cgi?id=40871
Bug ID: 40871
Summary: Wrong debug info generated at -O3 (-O0 is correct)
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Keywords: wrong-debug
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: dav...@freebsd.org
CC: cmt...@google.com, dblai...@gmail.com,
echri...@gmail.com, jeremy.morse.l...@gmail.com,
llvm-bugs@lists.llvm.org, v...@apple.com
$ cat outer.c
optimize_me_not() {}
$ cat a.c
int main() {
int k = 0;
for (; k < 1; k++)
;
optimize_me_not();
}
### -O0
(lldb) r
Process 7046 launched: '/home/davide/LLDB-testing/reduce/a.out' (x86_64)
Process 7046 stopped
* thread #1, name = 'a.out', stop reason = breakpoint 1.1
frame #0: 0x00000000004004b3 a.out`main at abc.c:5:3
2 int k = 0;
3 for (; k < 1; k++)
4 ;
-> 5 optimize_me_not();
6 }
(lldb) frame var k
(int) k = 1
### -O3
Current executable set to './a.out' (x86_64).
(lldb) br set -p optimize_me_not
Breakpoint 1: where = a.out`main + 1 at abc.c:5:3, address = 0x0000000000400481
(lldb) r
Process 20271 launched: '/home/davide/LLDB-testing/reduce/a.out' (x86_64)
Process 20271 stopped
* thread #1, name = 'a.out', stop reason = breakpoint 1.1
frame #0: 0x0000000000400481 a.out`main at abc.c:5:3
2 int k = 0;
3 for (; k < 1; k++)
4 ;
-> 5 optimize_me_not();
6 }
(lldb) frame var k
(int) k = 0
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