Add __pthread_key_create alias

Some versions of std::thread use it to detect the presence of libpthread (don't
ask why)

* sysdeps/hurd/pt-key-create.c (pthread_key_create): Rename to
__pthread_key_create.
(pthread_key_create): Define as strong alias of __pthread_key_create.
* Versions (libpthread): Add __pthread_key_create.

2 files changed, 4 insertions, 1 deletions

diff --git a/Versions b/Versions
index 41bff96..19ff26c 100644
--- a/Versions
+++ b/Versions
@@ -88,6 +88,7 @@ libpthread {
     pthread_join;
 
     pthread_key_create; pthread_key_delete;
+    __pthread_key_create;
 
     pthread_kill;
 
diff --git a/sysdeps/hurd/pt-key-create.c b/sysdeps/hurd/pt-key-create.c
index b3e0141..42c7c85 100644
--- a/sysdeps/hurd/pt-key-create.c
+++ b/sysdeps/hurd/pt-key-create.c
@@ -31,7 +31,7 @@ int __pthread_key_count;
 int __pthread_key_invalid_count;
 
 int
-pthread_key_create (pthread_key_t *key, void (*destructor) (void *))
+__pthread_key_create (pthread_key_t *key, void (*destructor) (void *))
 {
   /* Where to look for the next key slot.  */
   static int index;
@@ -107,3 +107,5 @@ pthread_key_create (pthread_key_t *key, void (*destructor) (void *))
   __pthread_mutex_unlock (&__pthread_key_lock);
   return 0;
 }
+strong_alias (__pthread_key_create, pthread_key_create)
+hidden_def (__pthread_key_create)