https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65821
Bug ID: 65821
Summary: [4.8.2 regression] incorrect debug line # info for
main
Product: gcc
Version: 4.8.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
Assignee: unassigned at gcc dot gnu.org
Reporter: chihin.ko at oracle dot com
this happen since 4.8.2, 4.9.0 also have same problem.
cat t.cc
==========================================================
1 #include <stdio.h>
2
3 int b = 12;
4
5 inline void foo(const int &x = (b+3))
6 {
7 printf("%d\n", x);
8 } 9
10 inline void baz(const int &x = 200)
11 {
12 printf("%d\n", x);
13 }
14
15 inline void bar(int &x = b)
16 { 17 printf("%d\n", x);
18 x = 100;
19 printf("%d\n", x);
20 }
21
22
23 void
24 bob(char *s = "hello") 25 {
26 printf("%s\n", s);
27 } 28
29 int main()
30 {
31 foo(); 32 baz();
33 bar();
34 bob();
35 return 0;
36 }
====================================================
The line table for main is incorrect:
< 1><0x0000067e> DW_TAG_subprogram
DW_AT_external yes(1)
DW_AT_name "main"
DW_AT_decl_file 0x00000001 t.cc
DW_AT_decl_line 0x0000001d
DW_AT_type <0x00000491>
DW_AT_low_pc 0x0040129f
DW_AT_high_pc 0x004012ff
.debug_line
---
....
0x0040129f [ 30, 0] NS
0x004012a7 [ 5, 0] NS <==== extra line info
0x004012b0 [ 31, 0] NS
0x004012bf [ 32, 0] NS DI=0x1
0x004012d2 [ 33, 0] NS
0x004012dc [ 34, 0] NS
This cause follwing problem:
(gdb) b main
Breakpoint 1 at 0x4006ea: file c++defargs3.cc, line 5. <== should be line 31
(gdb) run
Starting program:
/workspace/chko/ws/dinstall/dbx_test/intel_S11_gcc482/c++defargs3.dbx,gcc/g47/a.out
Breakpoint 1, main () at c++defargs3.cc:5
5 inline void foo(const int &x = (b+3))
