GDB cannot find source file
I'm trying to debug my OpenCV code , but gdb won't load the OpenCV source file.
Checking for the presence of a source file:
$ls -l /home/rui/DriveSo/opencv/modules/core/src/matrix.cpp
-rw-r--r-- 1 rui rui 156046 May 11 21:46 /home/rui/DriveSo/opencv/modules/core/src/matrix.cpp
After linking with the OpenGV Debug mode libraries, I start dbg and add it to the list of source directories :
$gdb DriveSo
GNU gdb (Debian 7.7.1+dfsg-5) 7.7.1
....
Reading symbols from DriveSo...done.
(gdb) directory /home/rui/DriveSo/opencv/modules/core/src
Source directories searched: /home/rui/DriveSo/opencv/modules/core/src:$cdir:$cwd
(gdb) break matrix.cpp:2349
No source file named matrix.cpp.
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 1 (matrix.cpp:2349) pending.
Even after starting a session, gdb still doesn't find the original file:
(gdb) start
Temporary breakpoint 2 at 0x41d2cf: file ../../DriveSo.dkt/main.cpp, line 11.
Starting program: /home/rui/DriveSo/repositories/trunk/builds/build-DriveSo-Desktop_Qt_5_5_0_GCC_64bit-Debug/DriveSo
....
Temporary breakpoint 2, main (argc=1, argv=0x7fffffffe5a8) at ../../DriveSo.dkt/main.cpp:11
11 QCoreApplication::setApplicationName(QString("DriveSo"));
(gdb)
What could be causing this (for me) unexpected behavior?
Following on from iksajotien's suggestion, as far as I can see the executable has debug information ...
$ objdump --syms DriveSo | grep debug
0000000000000000 l d .debug_aranges 0000000000000000 .debug_aranges
0000000000000000 l d .debug_info 0000000000000000 .debug_info
0000000000000000 l d .debug_abbrev 0000000000000000 .debug_abbrev
0000000000000000 l d .debug_line 0000000000000000 .debug_line
0000000000000000 l d .debug_str 0000000000000000 .debug_str
0000000000000000 l d .debug_ranges 0000000000000000 .debug_ranges
... and the shared libraries it opened ...
$ lsof -p 12159
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
...
DriveSo 12159 rui mem REG 8,6 20289800 26740265 /usr/local/lib/libopencv_core.so.3.1.0
...
... also have debug information.
$ objdump --syms /usr/local/lib/libopencv_core.so.3.1.0 | grep debug
0000000000000000 l d .debug_aranges 0000000000000000 .debug_aranges
0000000000000000 l d .debug_info 0000000000000000 .debug_info
0000000000000000 l d .debug_abbrev 0000000000000000 .debug_abbrev
0000000000000000 l d .debug_line 0000000000000000 .debug_line
0000000000000000 l d .debug_str 0000000000000000 .debug_str
0000000000000000 l d .debug_ranges 0000000000000000 .debug_ranges
General information about gdb:
$gdb DriveSo
GNU gdb (Debian 7.7.1+dfsg-5) 7.7.1
...
Reading symbols from DriveSo...done.
(gdb) run
Starting program: /home/rui/DriveSo/repositories/trunk/builds/build-DriveSo-Desktop_Qt_5_5_0_GCC_64bit-Debug/DriveSo
...
^C
Program received signal SIGINT, Interrupt.
...
(gdb) info shared
From To Syms Read Shared Object Library
0x00007ffff7ddcae0 0x00007ffff7df5130 Yes /lib64/ld-linux-x86-64.so.2
No linux-vdso.so.1
0x00007ffff7158860 0x00007ffff794a910 Yes /usr/local/lib/libopencv_core.so.3.1
0x00007ffff6e5d880 0x00007ffff6e63a0b Yes /usr/local/lib/libopencv_highgui.so.3.1
0x00007ffff5493840 0x00007ffff690ce00 Yes /usr/local/lib/libopencv_imgproc.so.3.1
0x00007ffff50aa6f0 0x00007ffff5158bd1 Yes /usr/local/lib/libopencv_features2d.so.3.1
0x00007ffff4db8640 0x00007ffff4e3de75 Yes /usr/local/lib/libopencv_imgcodecs.so.3.1
0x00007ffff4b72a80 0x00007ffff4b931b0 Yes /usr/local/lib/libopencv_videoio.so.3.1
0x00007ffff47b7d40 0x00007ffff4920f80 Yes /usr/local/lib/libopencv_calib3d.so.3.1
...
---Type <return> to continue, or q <return> to quit---
Looking at the gdb source code , solib.c has a line at line 1053:
if (! ui_out_is_mi_like_p (interp_ui_out (top_level_interpreter ()))
&& so->symbols_loaded
&& !objfile_has_symbols (so->objfile))
{
so_missing_debug_info = 1;
ui_out_field_string (uiout, "syms-read", "Yes (*)");
}
else
ui_out_field_string (uiout, "syms-read",
so->symbols_loaded ? "Yes" : "No");
So I assume the symbols are loaded and the debug information exists, otherwise the libraries will be listed with Yes (*) or No
+1
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