| |
| Known problems in GDB 6.0 |
| |
| See also: http://www.gnu.org/software/gdb/bugs/ |
| |
| gdb/1091: Constructor breakpoints ignored |
| gdb/1193: g++ 3.3 creates multiple constructors: gdb 5.3 can't set breakpoints |
| |
| When gcc 3.x compiles a C++ constructor or C++ destructor, it generates |
| 2 or 3 different versions of the object code. These versions have |
| unique mangled names (they have to, in order for linking to work), but |
| they have identical source code names, which leads to a great deal of |
| confusion. Specifically, if you set a breakpoint in a constructor or a |
| destructor, gdb will put a breakpoint in one of the versions, but your |
| program may execute the other version. This makes it impossible to set |
| breakpoints reliably in constructors or destructors. |
| |
| gcc 3.x generates these multiple object code functions in order to |
| implement virtual base classes. gcc 2.x generated just one object code |
| function with a hidden parameter, but gcc 3.x conforms to a multi-vendor |
| ABI for C++ which requires multiple object code functions. |
