> > How about: > > > > #if defined(_POSIX_C_SOURCE) && defined(_POSIX_VERSION) && > > (_POSIX_VERSION >= 199506L) && !defined(_WIN32) > > > > which should be about right if I've understood the standard correctly. > > IMO there are several issues with above check. If you would take a look here > http://boost.sourceforge.net/regression-logs/cs-win32-links.html#config_info > %20gcc > > you will see that > > a. _POSIX_C_SOURCE is not defined
It's probably being overly picky requiring that one to be defined, strictly speaking you can't use any POSIX API's unless _POSIX_C_SOURCE has been defined before the inclusion of any std header - most platforms don't seem to care though. > b. _POSIX_VERSION is smaller Particular platforms may have sigaction support even though they only claim conformance to an earlier version of the POSIX standard - cygwin is one - check for __CYGWIN__. > P.S. Also let me revisit my other related question: would it be ok on all > compatible platforms to use csignal instead of signal.h? No, sigaction and friends aren't part of the C++ or C standards: you need to include <signal.h> to get the full unix definitions, not just those required by C++. John Maddock http://ourworld.compuserve.com/homepages/john_maddock/index.htm _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost
