[boost] Exception visibility and non-GCC compilers

Subject: [boost] Exception visibility and non-GCC compilers
From: Mathias Gaunard (mathias.gaunard_at_[hidden])
Date: 2012-04-30 14:02:58

Exceptions types need to be exported so that shared libraries work 
correctly.

Currently, the only code I see that does this is in Boost.Exception :

#if defined(__GNUC__)
# if (__GNUC__ == 4 && __GNUC_MINOR__ >= 1) || (__GNUC__ > 4)
#  pragma GCC visibility push (default)
# endif
#endif

... some exception type being declared or defined

#if defined(__GNUC__)
# if (__GNUC__ == 4 && __GNUC_MINOR__ >= 1) || (__GNUC__ > 4)
#  pragma GCC visibility pop
# endif
#endif

But shouldn't we have macros to make this work with other compilers too? 
I'm not sure all unix-like compilers pretend to be GCC 4.1+.