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This change:
Mon Mar 23 13:52:28 1998 Ulrich Drepper (drepper@cygnus.com)
* breakpoint.c (breakpoint_re_set_one): Treat bp_shlib_events
like bp_breakpoints.
causes a severe regression on Solaris platforms.
Under Solaris (and I suspect other SVR4 based platforms), the bp_shlib_event
breakpoint has a NULL addr_string, so the bp_shlib_event breakpoint gets
deleted by the first call to breakpoint_re_set_one.
As a consequence, you can no longer stop on solib events, the automatic
symbol adding for dlopened libs fails, and thread debugging (which relies
on automatic symbol adding) is completely hosed.
Below are the typescripts for two thread debugging sessions, using the
gdb/testsuite/gdb.threads/pthreads executable.
I have no idea what this patch tries to fix, but it should definitely get
reverted (or fixed otherwise) for the gdb-4.17 release.
pes@resunserv_693$ gdb-4.16.97 pthreads
GNU gdb 4.16.97
Copyright 1997 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "sparc-sun-solaris2.5.1"...
(gdb) b main
Breakpoint 1 at 0x10df4: file /usr/usrre/pes/gdbnd/devo/gdb/testsuite/gdb.threads/pthreads.c, line 116.
(gdb) r
Starting program: /afs/regent.e-technik.tu-muenchen.de/home/pes/pes/gdbnd/sun/gdb/testsuite/gdb.threads/pthreads
[New LWP 2 ]
Breakpoint 1, main (argc=0x1, argv=0xeffffa5c)
at /usr/usrre/pes/gdbnd/devo/gdb/testsuite/gdb.threads/pthreads.c:116
116 int t = 0;
(gdb) i threads
2 LWP 2 0xef679b38 in __signotifywait ()
* 1 LWP 1 main (argc=0x1, argv=0xeffffa5c)
at /usr/usrre/pes/gdbnd/devo/gdb/testsuite/gdb.threads/pthreads.c:116
(gdb) i shared
>From To Syms Read Shared Object Library
0xef740000 0xef7533c7 Yes /usr/lib/libpthread.so.1
0xef700000 0xef7257ac Yes /usr/lib/libm.so.1
0xef640000 0xef6d6a88 Yes /usr/lib/libc.so.1
0xef780000 0xef780470 Yes /usr/lib/libdl.so.1
0xef5c0000 0xef5eaeb8 No /usr/lib/libthread.so.1
(gdb) maint i b
Num Type Disp Enb Address What
1 breakpoint keep y 0x00010df4 in main
at /usr/usrre/pes/gdbnd/devo/gdb/testsuite/gdb.threads/pthreads.c:116
breakpoint already hit 1 time
Using gdb-4.16.86, or undoing the change, I get:
pes@resunserv_705$ gdb-4.16.97new pthreads
GNU gdb 4.16.97
Copyright 1997 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "sparc-sun-solaris2.5.1"...
(gdb) b main
Breakpoint 1 at 0x10df4: file /usr/usrre/pes/gdbnd/devo/gdb/testsuite/gdb.threads/pthreads.c, line 116.
(gdb) r
Starting program: /afs/regent.e-technik.tu-muenchen.de/home/pes/pes/gdbnd/sun/gdb/testsuite/gdb.threads/pthreads
[New LWP 2 ]
Breakpoint 1, main (argc=0x1, argv=0xeffffa5c)
at /usr/usrre/pes/gdbnd/devo/gdb/testsuite/gdb.threads/pthreads.c:116
116 int t = 0;
(gdb) i threads
5 Thread 3 0xef5c6548 in _swtch ()
4 Thread 2 (LWP 2) 0xef679b38 in __signotifywait ()
* 3 Thread 1 (LWP 1) main (argc=0x1, argv=0xeffffa5c)
at /usr/usrre/pes/gdbnd/devo/gdb/testsuite/gdb.threads/pthreads.c:116
2 LWP 2 0xef679b38 in __signotifywait ()
1 LWP 1 main (argc=0x1, argv=0xeffffa5c)
at /usr/usrre/pes/gdbnd/devo/gdb/testsuite/gdb.threads/pthreads.c:116
(gdb) i shared
>From To Syms Read Shared Object Library
0xef740000 0xef7533c7 Yes /usr/lib/libpthread.so.1
0xef700000 0xef7257ac Yes /usr/lib/libm.so.1
0xef640000 0xef6d6a88 Yes /usr/lib/libc.so.1
0xef780000 0xef780470 Yes /usr/lib/libdl.so.1
0xef5c0000 0xef5eaeb8 Yes /usr/lib/libthread.so.1
(gdb) maint i b
Num Type Disp Enb Address What
1 breakpoint keep y 0x00010df4 in main
at /usr/usrre/pes/gdbnd/devo/gdb/testsuite/gdb.threads/pthreads.c:116
breakpoint already hit 1 time
-1 shlib events keep y 0xef7cb938
breakpoint already hit 6 times
--
Peter Schauer pes@regent.e-technik.tu-muenchen.de