io.c: suppress unused variable warnings

* io.c (pipe_open): suppress warnings agains variable which are used
  when spawnv is available but fork is not.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36632 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 0 deletions

diff --git a/io.c b/io.c
index 33b609e915..52eb49574b 100644
--- a/io.c
+++ b/io.c
@@ -5506,8 +5506,10 @@ pipe_open(VALUE execarg_obj, const char *modestr, int fmode, convconfig_t *convc
 				      spawnv(P_NOWAIT, (cmd), (args)) : \
 				      spawn(P_NOWAIT, (cmd)))
 # endif
+# if !defined(HAVE_FORK)
     char **args = NULL;
     char **envp = NULL;
+# endif
 #endif
 #if !defined(HAVE_FORK)
     struct rb_execarg sarg, *sargp = &sarg;