diff --git a/librb/include/rb_helper.h b/librb/include/rb_helper.h
index 0b4a90865..01868b678 100644
--- a/librb/include/rb_helper.h
+++ b/librb/include/rb_helper.h
@@ -58,5 +58,5 @@ void rb_helper_write_flush(rb_helper *helper);
 void rb_helper_run(rb_helper *helper);
 void rb_helper_close(rb_helper *helper);
 int rb_helper_read(rb_helper *helper, void *buf, size_t bufsize);
-void rb_helper_loop(rb_helper *helper, long delay);
+void rb_helper_loop(rb_helper *helper, long delay) __attribute__((noreturn));
 #endif
diff --git a/librb/include/rb_lib.h b/librb/include/rb_lib.h
index 7646718e6..2a817408b 100644
--- a/librb/include/rb_lib.h
+++ b/librb/include/rb_lib.h
@@ -215,14 +215,14 @@ typedef void die_cb(const char *buffer);
 char *rb_ctime(const time_t, char *, size_t);
 char *rb_date(const time_t, char *, size_t);
 void rb_lib_log(const char *, ...);
-void rb_lib_restart(const char *, ...);
+void rb_lib_restart(const char *, ...) __attribute__((noreturn));
 void rb_lib_die(const char *, ...);
 void rb_set_time(void);
 const char *rb_lib_version(void);
 
 void rb_lib_init(log_cb * xilog, restart_cb * irestart, die_cb * idie, int closeall, int maxfds,
 		 size_t dh_size, size_t fd_heap_size);
-void rb_lib_loop(long delay);
+void rb_lib_loop(long delay) __attribute__((noreturn));
 
 time_t rb_current_time(void);
 const struct timeval *rb_current_time_tv(void);
diff --git a/librb/include/rb_memory.h b/librb/include/rb_memory.h
index 1bc7af098..222b5c8d9 100644
--- a/librb/include/rb_memory.h
+++ b/librb/include/rb_memory.h
@@ -33,7 +33,7 @@
 #include <stdlib.h>
 
 
-void rb_outofmemory(void);
+void rb_outofmemory(void) __attribute__((noreturn));
 
 static inline void *
 rb_malloc(size_t size)
diff --git a/librb/src/balloc.c b/librb/src/balloc.c
index 71b36cabf..2cbe4350f 100644
--- a/librb/src/balloc.c
+++ b/librb/src/balloc.c
@@ -58,6 +58,8 @@
 #include <librb_config.h>
 #include <rb_lib.h>
 
+static void _rb_bh_fail(const char *reason, const char *file, int line) __attribute__((noreturn));
+
 static uintptr_t offset_pad;
 
 /* status information for an allocated block in heap */
diff --git a/librb/src/commio.c b/librb/src/commio.c
index b40a5cc2d..252e6e9d2 100644
--- a/librb/src/commio.c
+++ b/librb/src/commio.c
@@ -1345,16 +1345,13 @@ rb_inet_ntop_sock(struct sockaddr *src, char *dst, unsigned int size)
 	{
 	case AF_INET:
 		return (rb_inet_ntop(AF_INET, &((struct sockaddr_in *)src)->sin_addr, dst, size));
-		break;
 #ifdef RB_IPV6
 	case AF_INET6:
 		return (rb_inet_ntop
 			(AF_INET6, &((struct sockaddr_in6 *)src)->sin6_addr, dst, size));
-		break;
 #endif
 	default:
 		return NULL;
-		break;
 	}
 }
 
diff --git a/librb/src/crypt.c b/librb/src/crypt.c
index 9344e988d..b2e372401 100644
--- a/librb/src/crypt.c
+++ b/librb/src/crypt.c
@@ -46,16 +46,12 @@ rb_crypt(const char *key, const char *salt)
 		{
 		case '1':
 			return rb_md5_crypt(key, salt);
-			break;
 		case '5':
 			return rb_sha256_crypt(key, salt);
-			break;
 		case '6':
 			return rb_sha512_crypt(key, salt);
-			break;
 		default:
 			return NULL;
-			break;
 		};
 	}
 	else
@@ -536,7 +532,7 @@ rb_do_des(uint32_t l_in, uint32_t r_in, uint32_t *l_out, uint32_t *r_out, int co
 	 *      l_in, r_in, l_out, and r_out are in pseudo-"big-endian" format.
 	 */
 	uint32_t l, r, *kl, *kr, *kl1, *kr1;
-	uint32_t f, r48l, r48r;
+	uint32_t f = 0, r48l, r48r;
 	int round;
 
 	if(count == 0)
@@ -748,9 +744,6 @@ rb_des_crypt(const char *key, const char *setting)
  * edited for clarity and style only.
  */
 
-#define MD5_BLOCK_LENGTH                64
-#define MD5_DIGEST_LENGTH               16
-#define MD5_DIGEST_STRING_LENGTH        (MD5_DIGEST_LENGTH * 2 + 1)
 #define MD5_SIZE			16
 
 static void
diff --git a/librb/src/linebuf.c b/librb/src/linebuf.c
index 33977f808..77fe9b7d8 100644
--- a/librb/src/linebuf.c
+++ b/librb/src/linebuf.c
@@ -31,10 +31,6 @@ static rb_bh *rb_linebuf_heap;
 
 static int bufline_count = 0;
 
-#ifndef LINEBUF_HEAP_SIZE
-#define LINEBUF_HEAP_SIZE 2048
-#endif
-
 /*
  * rb_linebuf_init
  *
diff --git a/librb/src/patricia.c b/librb/src/patricia.c
index 9db07138d..fe02c73c3 100644
--- a/librb/src/patricia.c
+++ b/librb/src/patricia.c
@@ -27,10 +27,6 @@
  * #define PATRICIA_DEBUG 1
  */
 
-#define PREFIX_HEAP_COUNT	1024
-#define NODE_HEAP_COUNT		1024
-#define PATRICIA_HEAP_COUNT	128
-
 void
 rb_init_patricia(void)
 {