Bug#540640: libstdc++6-4.3-dbg is not useful

[Philip Ashmore]

I wrote a bash script to reproduce this bug - please find it attached.

I snipped the i_chunk_stream classes from my SourceForge project http://sourceforge.net/projects/v3c.

from a script.

To get around this and to compare your output to mine, run the script as

   ./dbgtest.sh </dev/null > dbgtest-cmp.txt

Here's my output from this test.


### Listing installed packages matching libstdc++6*
ii libstdc++6 4.3.2-1.1 The GNU Standard C++ Library v3
ii libstdc++6-4.3-dbg 4.3.2-1.1 The GNU Standard C++ Library v3 (debugging f
ii libstdc++6-4.3-dev 4.3.2-1.1 The GNU Standard C++ Library v3 (development
ii libstdc++6-4.3-doc 4.3.2-1.1 The GNU Standard C++ Library v3 (documentati

### Writing dbgtest.cpp

### Compiling/linking dbgtest.cpp with debugging information

### Listing libraries dbgtest links with.
   linux-vdso.so.1 =>  (0x00007fff63bff000)
   libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00007f115b501000)
   libm.so.6 => /lib/libm.so.6 (0x00007f115b27e000)
   libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00007f115b067000)
   libc.so.6 => /lib/libc.so.6 (0x00007f115ad14000)
   /lib64/ld-linux-x86-64.so.2 (0x00007f115b80d000)

### Running dbgtest with gdb - press <ENTER> to finish...
~"GNU gdb 6.8-debian\n"
~"Copyright (C) 2008 Free Software Foundation, Inc.\n"

For some reason gdb insists on a final <ENTER> from the keyboard before it quits even though it's run You will see source file and line numbers from dbgtest.cpp in the stack trace but not from the standard library. ~"License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>\n"

~"This is free software: you are free to change and redistribute it.\n"

~"and \"show warranty\" for details.\n"
~"This GDB was configured as \"x86_64-linux-gnu\"...\n"
(gdb)
&"break i_chunk_streambuf::underflow()\n"
~"Breakpoint 1 at 0x401b82: file dbgtest.cpp, line 23.\n"
^done
(gdb)
&"run\n"
~"Starting program: /v3c/dev/bugs/Debian/dbgtest \n"
~"\n"

~"23\t\t\tcout << \"underflow() called.\" << endl;\n"
^done
(gdb)
&"bt\n"

~"#5  0x00000000004018e9 in test2 () at dbgtest.cpp:64\n"

^done
(gdb)
&"c\n"
~"Continuing.\n"
underflow() called.
Success!
~"\n"
~"Program exited normally.\n"
^done
(gdb)
^exit
### Done.

~"There is NO WARRANTY, to the extent permitted by law. Type \"show copying\"\n" ~"Breakpoint 1, i_chunk_streambuf::underflow (this=0x7fff8dfba270) at dbgtest.cpp:23\n" ~"#0 i_chunk_streambuf::underflow (this=0x7fff8dfba270) at dbgtest.cpp:23\n" ~"#1 0x00007f6185b1f02c in std::num_get<char, std::istreambuf_iterator<char, std::char_traits<char> > >::_M_extract_int<long> () from /usr/lib/libstdc++.so.6\n" ~"#2 0x00007f6185b1f270 in std::num_get<char, std::istreambuf_iterator<char, std::char_traits<char> > >::do_get () from /usr/lib/libstdc++.so.6\n" ~"#3 0x00007f6185b0ded1 in std::istream::_M_extract<long> () from /usr/lib/libstdc++.so.6\n" ~"#4 0x00007f6185b0dfae in std::istream::operator>> () from /usr/lib/libstdc++.so.6\n" ~"#6 0x0000000000401a57 in main (argc=1, argv=0x7fff8dfba4e8) at dbgtest.cpp:82\n"

dbgtest.sh
Description: Bourne shell script