https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61574
Bug ID: 61574
Summary: Confusing .debug_line generation by -g option
Product: gcc
Version: 4.8.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: jamesgua at ca dot ibm.com
#include <iostream>
#include <string>
using namespace std;
int main(int argc, char** argv)
{
string str1 = "Hello";
string str2;
str2 = str1;
cout << "str2: " << str2 << ", and same as str1: " << str1 << endl;
str2 += "World!";
cout << "Now str2: " << str2 << endl;
return 0;
}
g++ -g -osample sample.cpp
gdb ./sample
...
Breakpoint 1, main (argc=1, argv=0x3ffffffff4f8) at sample.cpp:17
17 return 0;
(gdb) n
9 string str2;
(gdb)
17 return 0;
(gdb)
18 }
...
This is really confusing and out of sequential execution expectation. It
happens on x86_64/ppcl4le platform using g++ 4.8.2.
Output from cmd: readelf --debug-dump=decodedline sample
...
sample.cpp 17 0x10000e90
sample.cpp 9 0x10000e94
sample.cpp 17 0x10000ea4
sample.cpp 9 0x10000ee4
sample.cpp 17 0x10000efc
...
