Environ.hpp

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#ifndef BLOCXX_ENVIRON_HPP_INCLUDE_GUARD_
#define BLOCXX_ENVIRON_HPP_INCLUDE_GUARD_
 
#include "blocxx/BLOCXX_config.h"
 
#if defined(BLOCXX_DARWIN)
// On MacOSX, environ is not defined in shared libraries.  It is only provided
// for executables.  Since the linker must resolve all symbols at link time,
// the normal extern declaration of environ won't work.  As a substitute, we
// need to use this:
#include <crt_externs.h>
#define environ (*_NSGetEnviron())
 
// For more details on the subject, follow one of these links:
// http://lists.gnu.org/archive/html/bug-guile/2004-01/msg00013.html
// http://lists.apple.com/archives/darwin-dev/2005/Mar/msg00132.html
// http://www.metapkg.org/wiki/15 (under the linking problems)
 
#else /* !DARWIN */
// according to man environ:
// This variable must be declared in the user program, but is
// declared in the header file unistd.h in case the header files came from
// libc4 or libc5, and in case they came from glibc and _GNU_SOURCE was
// defined.
BLOCXX_IMPORT extern char** environ;
#endif /* DARWIN */
 
#endif /* INCLUDE_GUARD */