re PR ada/27366 (ada build fails as cygwin does not have clearenv)

2006-05-02  David Billinghurst <David.Billinghurst@riotinto.com>
 
         PR ada/27366
         * ada/env.c (__gnat_clearenv): Use unsetenv() to clear
	 environment on Cygwin.

From-SVN: r113457

gcc/ChangeLog

+2006-05-02  David Billinghurst <David.Billinghurst@riotinto.com>
+
+	PR ada/27366
+ 	* ada/env.c (__gnat_clearenv): Use unsetenv() to clear environment 
+ 	on Cygwin.
+
 2006-05-02  Jakub Jelinek  <jakub@redhat.com>
 
 	PR middle-end/27337

gcc/ada/env.c

@@ -288,7 +288,7 @@ void __gnat_clearenv (void) {
     index++;
   }
 #elif defined (__MINGW32__) || defined (__FreeBSD__) || defined (__APPLE__) \
-   || (defined (__vxworks) && defined (__RTP__))
+   || (defined (__vxworks) && defined (__RTP__)) || defined (__CYGWIN__)
   /* On Windows, FreeBSD and MacOS there is no function to clean all the
      environment but there is a "clean" way to unset a variable. So go
      through the environ table and call __gnat_unsetenv on all entries */