gdb ./test
GNU gdb (GDB) Red Hat Enterprise Linux (7.2-75.el6)
Copyright (C) 2010 Free Software Foundation, Inc.
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Reading symbols from /afs/cern.ch/user/m/mkrafczy/lxplus/Software/root_gdb_test/test...done.
(gdb) br test.cpp:19
Breakpoint 1 at 0x400bb8: file test.cpp, line 19.
(gdb) run
Starting program: /afs/cern.ch/user/m/mkrafczy/lxplus/Software/root_gdb_test/test 
[Thread debugging using libthread_db enabled]
A

Breakpoint 1, main () at test.cpp:20
20		printf("B\n");
Missing separate debuginfos, use: debuginfo-install glibc-2.12-1.149.el6.x86_64 libgcc-4.4.7-11.el6.x86_64 libstdc++-4.4.7-11.el6.x86_64 openssl-1.0.1e-30.el6_6.4.x86_64 snoopy-1.7.10-1.el6.x86_64 zlib-1.2.3-29.el6.x86_64
(gdb) print test_hist
$1 = (TH2D *) 0x8e8630
(gdb) ptype TH2D
No symbol "TH2D" in current context.
(gdb) ptype test_hist
type = class TH2D {
    <incomplete type>
} *
(gdb) q
A debugging session is active.

	Inferior 1 [process 28483] will be killed.

Quit anyway? (y or n) y