From 16a522bab047f3014f08302042ab90cf5812b131 Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Wed, 16 Jan 2019 23:50:08 -0500
Subject: [PATCH] fix unintended linking dependency of pthread_key_create on
 __synccall

commit 84d061d5a31c9c773e29e1e2b1ffe8cb9557bc58 attempted to do this
already, but omitted from pthread_key_create.c the weak definition of
__pthread_key_delete_synccall, so that the definition provided by
pthread_key_delete.c was always pulled in.

based on patch by Markus Wichmann, but with a weak alias rather than
weak reference for consistency/policy about dependence on tooling
features.
---
 src/thread/pthread_key_create.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/thread/pthread_key_create.c b/src/thread/pthread_key_create.c
index e26f199c..0903d48f 100644
--- a/src/thread/pthread_key_create.c
+++ b/src/thread/pthread_key_create.c
@@ -35,6 +35,12 @@ static void clean_dirty_tsd_callback(void *p)
 	if (args->caller == self) args->ret = 0;
 }
 
+static void dummy2(void (*f)(void *), void *p)
+{
+}
+
+weak_alias(dummy2, __pthread_key_delete_synccall);
+
 static int clean_dirty_tsd(void)
 {
 	struct cleanup_args args = {