blocxx

Environ.hpp

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00002 * Copyright (C) 2005, Quest Software, Inc. All rights reserved.
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00032 
00033 
00034 #ifndef BLOCXX_ENVIRON_HPP_INCLUDE_GUARD_
00035 #define BLOCXX_ENVIRON_HPP_INCLUDE_GUARD_
00036 
00042 #include "blocxx/BLOCXX_config.h"
00043 
00044 #if defined(BLOCXX_DARWIN)
00045 // On MacOSX, environ is not defined in shared libraries.  It is only provided
00046 // for executables.  Since the linker must resolve all symbols at link time,
00047 // the normal extern declaration of environ won't work.  As a substitute, we
00048 // need to use this:
00049 #include <crt_externs.h>
00050 #define environ (*_NSGetEnviron())
00051 
00052 // For more details on the subject, follow one of these links:
00053 // http://lists.gnu.org/archive/html/bug-guile/2004-01/msg00013.html
00054 // http://lists.apple.com/archives/darwin-dev/2005/Mar/msg00132.html
00055 // http://www.metapkg.org/wiki/15 (under the linking problems)
00056 
00057 #else /* !DARWIN */
00058 // according to man environ:
00059 // This variable must be declared in the user program, but is
00060 // declared in the header file unistd.h in case the header files came from
00061 // libc4 or libc5, and in case they came from glibc and _GNU_SOURCE was
00062 // defined.
00063 BLOCXX_IMPORT extern char** environ;
00064 #endif /* DARWIN */
00065 
00066 #endif /* INCLUDE_GUARD */