[boost] [boost.exception] GCC and symbols hidden by default

From: Pavel Vozenilek (pavel_vozenilek_at_[hidden])
Date: 2007-01-30 12:59:48

(This is originally a private mail reposted with hope
to get more feedback. Boost.Exception
http://www.revergestudios.com/boost-exception/boost-exception.htm
is a library waiting in review queue.)

Hello Emil,

When using your library I met 2 problems:

* GCC 3.4.2, shipped with MingW
  (and part of wxDevC++ IDE, on Windows)
  fails to recognize
  boost::exception::what() as
  overide of std::exception::what()
  and ends with an error.

  I was not able to find what could
  be the problem, everything looked OK.

  At the end, not knowing better,
  I changed the name to what2().

* When using GCC 4.1.1 which has ability
  to hide symbols in a shared library by default
  I run in the problem described in
   http://gcc.gnu.org/wiki/Visibility
   in section "Problems with C++ exceptions (please read!)".

   Currently, I reenabled exporting all symbols by default.
   The OS is Linux.

/Pavel