initialize variables

* string.c (rb_str_enumerate_lines): initialize conditionally
  used variable.

* thread.c (rb_fd_no_init): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57625 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

string.c

@@ -7493,8 +7493,7 @@ rb_str_enumerate_lines(int argc, VALUE *argv, VALUE str, int wantarray)
     const char *ptr, *pend, *subptr, *subend, *rsptr, *hit, *adjusted;
     long pos, len, rslen;
     int rsnewline = 0;
-
-    VALUE MAYBE_UNUSED(ary);
+    VALUE ary = 0;
 
     if (rb_scan_args(argc, argv, "01:", &rs, &opts) == 0)
 	rs = rb_rs;
@@ -7517,9 +7516,6 @@ rb_str_enumerate_lines(int argc, VALUE *argv, VALUE str, int wantarray)
 	    wantarray = 0;
 #endif
 	}
-#if defined __GNUC__ && !defined __clang__
-	ASSUME(wantarray || !ary); /* if wantarray, ary does not matter */
-#endif
     }
     else {
 	if (wantarray)

thread.c

@@ -3573,9 +3573,7 @@ rb_fd_select(int n, rb_fdset_t *readfds, rb_fdset_t *writefds, rb_fdset_t *excep
     return select(n, r, w, e, timeout);
 }
 
-#if defined __GNUC__ && __GNUC__ >= 5
-# define rb_fd_no_init(fds) ASSUME(!(fds)->fdset && !(fds)->maxfd)
-#endif
+#define rb_fd_no_init(fds) (((fds)->fdset = 0), ((fds)->maxfd = 0))
 
 #undef FD_ZERO
 #undef FD_SET
@@ -3640,9 +3638,7 @@ rb_fd_set(int fd, rb_fdset_t *set)
 #define FD_CLR(i, f)	rb_fd_clr((i), (f))
 #define FD_ISSET(i, f)	rb_fd_isset((i), (f))
 
-#if defined __GNUC__ && __GNUC__ >= 5
-# define rb_fd_no_init(fds) ASSUME(!(fds)->fdset)
-#endif
+#define rb_fd_no_init(fds) ((fds)->fdset = 0)
 
 #endif