test-perror: relax test to ignore cygwin bug

[gnulib.git] / doc / posix-functions / environ.texi

diff --git a/doc/posix-functions/environ.texi b/doc/posix-functions/environ.texi
index d89187b..64eddf6 100644 (file)
--- a/doc/posix-functions/environ.texi
+++ b/doc/posix-functions/environ.texi
@@ -2,20 +2,33 @@
 @section @code{environ}
 @findex environ
 
-POSIX specification: @url{http://www.opengroup.org/susv3xsh/environ.html}
+POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/environ.html}
 
-Gnulib module: ---
+Gnulib module: environ
 
 Portability problems fixed by Gnulib:
 @itemize
+@item
+POSIX does not require this variable to be declared, and it is indeed not
+declared on some platforms:
+MacOS X 10.5, FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, IRIX 6.5, Solaris 11 2010-11.
+@item
+On MacOS X 10, this variable is not declared.  Up to MacOS X 10.4, one can use
+@smallexample
+extern char **environ;
+@end smallexample
+to get the variable declared.  This does not work any more, however, in
+shared libraries on MacOS X 10.5.  Here is a workaround: Instead, one can use
+@smallexample
+#include <crt_externs.h>
+#define environ (*_NSGetEnviron())
+@end smallexample
+This works at all versions of MacOS X.
 @end itemize
 
 Portability problems not fixed by Gnulib:
 @itemize
 @item
-This variable is missing on some platforms:
-MacOS X 10.3, FreeBSD 6.0, NetBSD 3.0, OpenBSD 3.8, IRIX 6.5, OSF/1 5.1, Cygwin.
-@item
 The address of this variable is not a compile-time constant on some platforms:
 mingw.
 @end itemize