Trying to set a conditional breakpoint to stop at a specific value of a string.
Following set of commands I have tried:
Set 1:
(gdb) b file.C:97 if strcmp(pName, "abc") == 0
set 2:
(gdb) b file.C:97
(gdb) cond 1 !strcmp(pName, "abc")
set 3:
(gdb) b file.C:97
(gdb) set $str = "abc"
(gdb) cond 1 strcmp (pName, $str) == 0
Both of these are ending with a segmentation fault at STL of strcmp:
Continuing.
Detaching after fork from child process 12742.
Detaching after fork from child process 12818.
Detaching after fork from child process 12819.
FUSION: detected debugger running, not catching non-fusion exceptions
Program received signal SIGSEGV, Segmentation fault.
__strcmp_sse42 () at ../sysdeps/x86_64/multiarch/strcmp.S:260
Error in testing breakpoint condition:
The program being debugged was signaled while in a function called from GDB.
GDB remains in the frame where the signal was received.
To change this behavior use "set unwindonsignal on".
Evaluation of the expression containing the function
(__strcmp_sse42) will be abandoned.
When the function is done executing, GDB will silently stop.
Breakpoint 1, __strcmp_sse42 () at ../sysdeps/x86_64/multiarch/strcmp.S:260
/usr/src/debug/glibc-2.12-2-gc4ccff1/sysdeps/x86_64/multiarch/strcmp.S:260:7925:beg:0x32f912871a
Using find() is not ending up with segmentation fault, but the breakpoint is stopping without applying the condition:
(gdb) b file.C:97
(gdb) set $str = "abc"
(gdb) cond 1 pName.find($str) == 0
These above commands I have tried on GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-47.el6
If I try GNU gdb (GDB) 8.1.90.20180726-git, it's ending with a new issue.
Though pName is defined as string,
I am getting the following after stopping debugger at breakpoint(without the condition using strcmp()):
(gdb) print pName
4: (string)pName = {static npos = <optimized out>, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x2aebca8 "xyz"}}
On GDB 7.6.1-47.el6, after applying simple breakpoint(without any condition), print pName only gives 'xyz'.
Is it possible to do the same in GDB 8.1.90.20180726?
Anyway, please suggest me a way to put the condition breakpoint on string successfully!
