[Cmake] Problem with -fPIC, dlopen and exception handling.

[Marc Traina]

I still think that these posts are not so far from my problem, but 
anyway, my system is an old Red Hat version of Linux patched several times.

So, I will search deeper in that way with our system administrators.

For the moment, I have apply your solution to remove the -fPIC flag on 
my specific system (tested with uname -s and -r).
It works well.

Thanks for your help

Marc


Brad King wrote:

>>These are the posts I have found concerning the same problem :
>>http://groups.google.fr/groups?q=dlopen+fpic+exception+handled&hl=fr&lr=&ie=UTF-8&oe=UTF-8&scoring=d&selm=3AB10AFD.C003554D%40earthlink.net&rnum=1
>>    
>>
>
>This one describes a problem resulting from having a C executable for
>main() and loading a C++ shared library.
>
>  
>
>>http://groups.google.fr/groups?q=fpic+exception+dlopen+g%2B%2B&hl=fr&lr=&ie=UTF-8&oe=UTF-8&selm=449d8b5a.0105220805.54b7f35c%40posting.google.com&rnum=2
>>    
>>
>
>This one describes a problem with an exception passing through the
>C-implemented dl library code.
>
>  
>
>>http://gcc.gnu.org/ml/gcc-bugs/1999-01/msg00782.html
>>    
>>
>
>This one seems to describe a bug that exists in egcs, which was a compiler
>version before egcs and gcc merged together in gcc 2.95.  Note also that
>the problem occurs even though the .o is built without -fPIC.
>
>None of these seems to describe your problem exactly.  I'm surprised that
>your example code fails for you because it doesn't have any of the
>problems described in these messages.  I'd suggest looking for a solution
>other than removing -fPIC, but if you end up deciding to go that way, here
>is how:
>
>Create a file that will be used to override makefile rule generation:
>
># MyMakeRules.cmake:
>SET(CMAKE_SHARED_LIBRARY_CXX_FLAGS "")
>
>This file can be located anywhere you wish, and have any name.  The
>CMAKE_SHARED_LIBRARY_CXX_FLAGS specifies the flags used to compile a .o
>file that will be in a C++ shared library.  It is normally set to "-fPIC"
>on linux.
>
>Add the following cache entry to the project:
>
>CMAKE_USER_MAKE_RULES_OVERRIDE:STRING=<path-to>MyMakeRules.cmake
>
>(obviously, you have to write something in place of "<path-to>"). This
>tells CMake where to load the project's override rules. You can setup your
>CMake listfile code to do this automatically like this:
>
>IF( ... test for whether this platform needs work-around ... )
>  SET(CMAKE_USER_MAKE_RULES_OVERRIDE "${FOO_SOURCE_DIR}/MyMakeRules.cmake"
>      CACHE STRING "Override makefile generation rules.")
>ENDIF( ... test for whether this platform needs work-around ... )
>
>-Brad
>
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>