change(user-sh): suppress runcmd() warning

user-space-program/sh.c

@@ -56,6 +56,15 @@ int fork1(void);  // Fork but panics on failure.
 void panic(char*);
 struct cmd *parsecmd(char*);
 
+#ifdef __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Winfinite-recursion"
+#else
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Winfinite-recursion"
+#endif
+#endif
 // Execute cmd.  Never returns.
 void
 runcmd(struct cmd *cmd)
@@ -133,6 +142,13 @@ runcmd(struct cmd *cmd)
   }
   _exit(0);
 }
+#ifdef __clang__
+#pragma clang diagnostic pop
+#else
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif
+#endif
 
 int
 getcmd(char *buf, int nbuf)