RE: gdb 5.3 bug

["Lev Assinovsky" <LAssinovsky@algorithm.aelita.com>]

Yes, it does:
----------
(gdb) set stop-on-solib-events 1
(gdb) r
Starting program: /export/home/lev/src/Installation/packages/Personal/LevAssinovsky/virtfun/load 
warning: Unable to find dynamic linker breakpoint function.
GDB will be unable to debug shared library initializers
and track explicitly loaded dynamic code.
Stopped due to shared library event
-----------
But what the warning mean?

Sincerely,
----
Lev Assinovsky
Aelita Software Corporation
O&S Core Division, Programmer
ICQ# 165072909


> -----Original Message-----
> From: Daniel Jacobowitz [mailto:drow@mvista.com]
> Sent: Wednesday, March 05, 2003 6:57 PM
> To: Lev Assinovsky
> Cc: gdb@sources.redhat.com
> Subject: Re: gdb 5.3 bug
> 
> 
> I don't know.  Does "set stop-on-solib-events 1" cause your program to
> stop?
> 
> On Wed, Mar 05, 2003 at 05:27:09PM +0300, Lev Assinovsky wrote:
> > Daniel!
> > I was wrong!
> > I can step into the function of dynamic library if 
> > I run the command "sharedlibrary" before.
> > Why are symbols coming in only after that command
> > and auto-solib-add (=on) doesn't work?  
> > 
> > ----
> > Lev Assinovsky
> > Aelita Software Corporation
> > O&S Core Division, Programmer
> > ICQ# 165072909
> > 
> > 
> > > -----Original Message-----
> > > From: Daniel Jacobowitz [mailto:drow@mvista.com]
> > > Sent: Saturday, March 01, 2003 7:05 PM
> > > To: Lev Assinovsky
> > > Cc: gdb@sources.redhat.com
> > > Subject: Re: gdb 5.3 bug
> > > 
> > > 
> > > On Sat, Mar 01, 2003 at 06:59:45PM +0300, Lev Assinovsky wrote:
> > > > Dear Daniel!
> > > > Thank you very match for your advise!
> > > > Snapshot gdb+dejagnu-20030228 works just fine!
> > > > Thank a lot all guys who is involved in gdb development. 
> > > > I am sorry but I have to bother you with another gdb problem.
> > > > The problem is I can't step into the function through 
> the pointer
> > > > if the function resides in dynamically loaded shared object 
> > > (library).
> > > > Here is the simple test case:
> > > 
> > > Hmm.  Your testcase works on GNU/Linux, so it must be related to
> > > i386-solaris shared library support.  Maybe someone else 
> on the list
> > > can help.
> > > 
> > > > 
> > > > 1. Shared object:
> > > > ---------- cut here --------
> > > > #include <iostream>
> > > > using namespace std;
> > > > 
> > > > extern "C" {
> > > >     void my_func()
> > > >     {
> > > >         cout << "This is my_func" << endl;
> > > >     }
> > > > 
> > > > }
> > > > ---------- cut here --------
> > > > 2. Main:
> > > > #include <iostream>
> > > > #include <memory>
> > > > #include <dlfcn.h>
> > > > #include <link.h>
> > > > 
> > > > using namespace std;
> > > > 
> > > > void * handle;
> > > > 
> > > > typedef void  ( *Func_t)();
> > > > 
> > > > Func_t getFunc() 
> > > > {
> > > >     Func_t p = (Func_t)dlsym ( handle, "my_func" );
> > > >     if ( NULL == p )
> > > >     {
> > > >         cout << dlerror() << endl;
> > > >         exit(2);
> > > >     }
> > > >     return p;
> > > > }
> > > > 
> > > > int main()
> > > > {
> > > >     handle = (void*) 
> > > ::dlopen("./func_so/bin/i386-sun-solaris/func_so.so", 
> > > RTLD_NOW | RTLD_LOCAL | RTLD_GROUP);
> > > >     if (handle == NULL)
> > > >     {
> > > >         cout << dlerror() << endl;
> > > >         exit(2);
> > > >     }
> > > > 
> > > >     Func_t f = getFunc();
> > > >     f();
> > > > }
> > > > ---------- cut here --------
> > > > 
> > > > This testcase works, but I can't step into f() (last 
> line) in gdb.
> > > > Is it possible to work around or fix this problem?
> > > > Thanks in advance!
> > > > 
> > > > ----
> > > > Lev Assinovsky
> > > > Aelita Software Corporation
> > > > O&S Core Division, Programmer
> > > > ICQ# 165072909
> > > > 
> > > > 
> > > > > -----Original Message-----
> > > > > From: Daniel Jacobowitz [mailto:drow@mvista.com]
> > > > > Sent: Friday, February 28, 2003 8:19 PM
> > > > > To: Lev Assinovsky; gdb@sources.redhat.com
> > > > > Subject: Re: gdb 5.3 bug
> > > > > 
> > > > > 
> > > > > On Thu, Feb 27, 2003 at 02:09:30PM -0500, Daniel 
> Jacobowitz wrote:
> > > > > > On Thu, Feb 27, 2003 at 09:11:14PM +0300, Lev 
> Assinovsky wrote:
> > > > > > > GNU gdb 5.3
> > > > > > > Copyright 2002 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 "i386-pc-solaris2.8"...
> > > > > > > (gdb) l
> > > > > > > 
> > > > > > > Program received signal SIGSEGV, Segmentation fault.
> > > > > > > 0x08136671 in finish_block (symbol=0x6e5f5f3a, 
> > > > > listhead=0x82241f4, old_blocks=0x3a787863, start=1634562671, 
> > > > > > >     end=1634562720, objfile=0x8263fe0) at buildsym.c:304
> > > > > > > 304           struct type *ftype = SYMBOL_TYPE (symbol);
> > > > > > > (gdb) 
> > > > > > > 
> > > > > > > 
> > > > > > > Any clue what might be the reason of gdb crash?
> > > > > > 
> > > > > > OK, the value of "symbol" is obviously wrong.  Could you 
> > > > > privately send
> > > > > > me the binary?  If that's not possible, at least a 
> > > > > backtrace would be
> > > > > > useful...
> > > > > 
> > > > > 
> > > > > Lev,
> > > > > 
> > > > > You're in luck, this has already been fixed.  It appears to 
> > > > > be a bug in
> > > > > the Sun compilers - it outputs end-of-function 
> markers without a
> > > > > corresponding beginning-of-function marker.  If you get a 
> > > GDB snapshot
> > > > > from CVS (http://sources.redhat.com/gdb/) it should handle 
> > > > > your program
> > > > > gracefully.
> > > > > 
> > > > > -- 
> > > > > Daniel Jacobowitz
> > > > > MontaVista Software                         Debian 
> > > GNU/Linux Developer
> > > > > 
> > > > 
> > > 
> > > -- 
> > > Daniel Jacobowitz
> > > MontaVista Software                         Debian 
> GNU/Linux Developer
> > > 
> > 
> 
> -- 
> Daniel Jacobowitz
> MontaVista Software                         Debian GNU/Linux Developer
>