[Bug c++/34294] New: Strange transmission of symbols between dynamically opened libs

[Bug c++/34294] New: Strange transmission of symbols between dynamically opened libs

[dvt at isoft dot fr]

We have several libraries that we load dynamically (dlopen), and from which we
use only one symbol, in which we use the same variable (char **) in the cpp
files. These symbols are never shared between libraries, but on this version
(4.2.1) of gcc, we experience big problems, because these homonym variables are
shared between the libraries : it looks like is we get the value of the first
dlopened library in all other libraries. This behaviour did not happen in gcc3,
neither does it on other compilers (MSDEV, IBM XLC, ...). To solve it, we had
to give a unique name to our variables : this works but is very dangerous,
since we are never sure that there will not be a side effect between normally
independant libraries.


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           Summary: Strange transmission of symbols between dynamically
                    opened libs
           Product: gcc
           Version: 4.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dvt at isoft dot fr
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34294

[Bug c++/34294] Strange transmission of symbols between dynamically opened libs

[pinskia at gcc dot gnu dot org]

------- Comment #1 from pinskia at gcc dot gnu dot org  2007-11-29 18:08 -------
Testcase?  It might be because you are using global bindings for the shared
libraries.

Note this really cannot be a GCC bug as GCC does not do dynamic loading.

"MSDEV, IBM XLC", have you tried GCC on Windows or AIX before?


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34294

[Bug c++/34294] Strange transmission of symbols between dynamically opened libs

[dvt at isoft dot fr]

------- Comment #2 from dvt at isoft dot fr  2007-11-29 18:16 -------
(In reply to comment #1)
> Testcase?  It might be because you are using global bindings for the shared
> libraries.
> Note this really cannot be a GCC bug as GCC does not do dynamic loading.
> "MSDEV, IBM XLC", have you tried GCC on Windows or AIX before?

In fact, our application is compiled on a lot of systems with gcc (<4 for all
others) : linux (fedora5), solaris (sparc and sparcv9), HP-UX (PA-RISSC 32 and
32 bits) and we never had this problem before. So, on this linux system
(centos4), it works when compiled with gcc 3.4, but not with gcc 4.2.1, that is
why we are sure it must come from gcc 4.2.1!


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34294

[Bug c++/34294] Strange transmission of symbols between dynamically opened libs

[rguenth at gcc dot gnu dot org]

------- Comment #3 from rguenth at gcc dot gnu dot org  2008-01-25 22:50 -------
Nothing to be done without a testcase.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34294