add some notes (thanks to mjn3) as to why we need these weaks, remove all the weaks that we arent actually using atm, and in general touchup the code

libc/misc/pthread/weaks.c

@@ -22,23 +22,20 @@
 #include <limits.h>
 #include <stdlib.h>
 
-static int __pthread_return_0 __P ((void));
-static int __pthread_return_1 __P ((void));
-
-static int
-__pthread_return_0 (void)
-{
-  return 0;
-}
-
-static int
-__pthread_return_1 (void)
-{
-  return 1;
-}
-
 /**********************************************************************/
 /* Weaks for application/library use.
+ *
+ * We need to define weaks here to cover all the pthread functions that
+ * libc itself will use so that we aren't forced to link libc.so to
+ * libpthread.so.  When an application doesn't use pthreads support,
+ * the locking functions used by libc itself basically become no-ops.
+ * However, if the application uses pthreads, then it will pull in
+ * libpthread.so whose symbols will override these weaks magically
+ * turning the internal libc mutex calls from no-ops to real locking
+ * calls.
+ */
+
+/* glibc itself defines all these, but we don't need them in uClibc
  *
  * Verified by comparing to glibc's linuxthreads/forward.c and defined
  * only those that are in the glibc abi.
@@ -46,22 +43,26 @@ __pthread_return_1 (void)
  * and which I left in for documentation.
  */
 
+static int __pthread_return_0 __P ((void));
+static int __pthread_return_0 (void) { return 0; }
+
+/*
 weak_alias (__pthread_return_0, pthread_attr_destroy)
 weak_alias (__pthread_return_0, pthread_attr_getdetachstate)
 weak_alias (__pthread_return_0, pthread_attr_getinheritsched)
 weak_alias (__pthread_return_0, pthread_attr_getschedparam)
 weak_alias (__pthread_return_0, pthread_attr_getschedpolicy)
 weak_alias (__pthread_return_0, pthread_attr_getscope)
-/* weak_alias (__pthread_return_0, pthread_attr_getstackaddr) */
-/* weak_alias (__pthread_return_0, pthread_attr_getstacksize) */
+weak_alias (__pthread_return_0, pthread_attr_getstackaddr)
+weak_alias (__pthread_return_0, pthread_attr_getstacksize)
 weak_alias (__pthread_return_0, pthread_attr_init)
 weak_alias (__pthread_return_0, pthread_attr_setdetachstate)
 weak_alias (__pthread_return_0, pthread_attr_setinheritsched)
 weak_alias (__pthread_return_0, pthread_attr_setschedparam)
 weak_alias (__pthread_return_0, pthread_attr_setschedpolicy)
 weak_alias (__pthread_return_0, pthread_attr_setscope)
-/* weak_alias (__pthread_return_0, pthread_attr_setstackaddr) */
-/* weak_alias (__pthread_return_0, pthread_attr_setstacksize) */
+weak_alias (__pthread_return_0, pthread_attr_setstackaddr)
+weak_alias (__pthread_return_0, pthread_attr_setstacksize)
 weak_alias (__pthread_return_0, pthread_cond_broadcast)
 weak_alias (__pthread_return_0, pthread_cond_destroy)
 weak_alias (__pthread_return_0, pthread_cond_init)
@@ -71,44 +72,44 @@ weak_alias (__pthread_return_0, pthread_cond_wait)
 weak_alias (__pthread_return_0, pthread_condattr_destroy)
 weak_alias (__pthread_return_0, pthread_condattr_init)
 weak_alias (__pthread_return_0, pthread_getschedparam)
-/* weak_alias (__pthread_return_0, pthread_getcancelstate) */
-/* weak_alias (__pthread_return_0, pthread_getconcurrency) */
-/* weak_alias (__pthread_return_0, pthread_getschedparam) */
+weak_alias (__pthread_return_0, pthread_getcancelstate)
+weak_alias (__pthread_return_0, pthread_getconcurrency)
 weak_alias (__pthread_return_0, pthread_mutex_destroy)
 weak_alias (__pthread_return_0, pthread_mutex_init)
 weak_alias (__pthread_return_0, pthread_mutex_lock)
-/* weak_alias (__pthread_return_0, pthread_mutex_trylock) */
+weak_alias (__pthread_return_0, pthread_mutex_trylock)
 weak_alias (__pthread_return_0, pthread_mutex_unlock)
-/* weak_alias (__pthread_return_0, pthread_mutexattr_destroy) */
-/* weak_alias (__pthread_return_0, pthread_mutexattr_gettype) */
-/* weak_alias (__pthread_return_0, pthread_mutexattr_init) */
-/* weak_alias (__pthread_return_0, pthread_mutexattr_settype) */
-/* weak_alias (__pthread_return_0, pthread_rwlock_destroy) */
-/* weak_alias (__pthread_return_0, pthread_rwlock_init) */
-/* weak_alias (__pthread_return_0, pthread_rwlock_rdlock) */
-/* weak_alias (__pthread_return_0, pthread_rwlock_tryrdlock) */
-/* weak_alias (__pthread_return_0, pthread_rwlock_trywrlock) */
-/* weak_alias (__pthread_return_0, pthread_rwlock_unlock) */
-/* weak_alias (__pthread_return_0, pthread_rwlock_wrlock) */
-/* weak_alias (__pthread_return_0, pthread_rwlockattr_destroy) */
-/* weak_alias (__pthread_return_0, pthread_rwlockattr_getpshared) */
-/* weak_alias (__pthread_return_0, pthread_rwlockattr_init) */
-/* weak_alias (__pthread_return_0, pthread_rwlockattr_setpshared) */
+weak_alias (__pthread_return_0, pthread_mutexattr_destroy)
+weak_alias (__pthread_return_0, pthread_mutexattr_gettype)
+weak_alias (__pthread_return_0, pthread_mutexattr_init)
+weak_alias (__pthread_return_0, pthread_mutexattr_settype)
+weak_alias (__pthread_return_0, pthread_rwlock_destroy)
+weak_alias (__pthread_return_0, pthread_rwlock_init)
+weak_alias (__pthread_return_0, pthread_rwlock_rdlock)
+weak_alias (__pthread_return_0, pthread_rwlock_tryrdlock)
+weak_alias (__pthread_return_0, pthread_rwlock_trywrlock)
+weak_alias (__pthread_return_0, pthread_rwlock_unlock)
+weak_alias (__pthread_return_0, pthread_rwlock_wrlock)
+weak_alias (__pthread_return_0, pthread_rwlockattr_destroy)
+weak_alias (__pthread_return_0, pthread_rwlockattr_getpshared)
+weak_alias (__pthread_return_0, pthread_rwlockattr_init)
+weak_alias (__pthread_return_0, pthread_rwlockattr_setpshared)
 weak_alias (__pthread_return_0, pthread_self)
 weak_alias (__pthread_return_0, pthread_setcancelstate)
 weak_alias (__pthread_return_0, pthread_setcanceltype)
-/* weak_alias (__pthread_return_0, pthread_setconcurrency) */
+weak_alias (__pthread_return_0, pthread_setconcurrency)
 weak_alias (__pthread_return_0, pthread_setschedparam)
 
-/* Those are pthread functions which return 1 if successful. */
+static int __pthread_return_1 __P ((void));
+static int __pthread_return_1 (void) { return 1; }
+
 weak_alias (__pthread_return_1, pthread_equal)
 
-/* pthread_exit () is a special case. */
-void weak_function 
-pthread_exit (void *retval)
+void weak_function pthread_exit (void *retval)
 {
   exit (EXIT_SUCCESS);
 }
+*/
 
 /**********************************************************************/
 /* Weaks used internally by the C library. */