From 3541925fb1db0bce7eaca7900fdd624e2f50ed6d Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Wed, 31 Jul 2019 17:18:21 -0400
Subject: fix missing declarations for pthread_join extensions in source file

per policy, define the feature test macro to get declarations for the
pthread_tryjoin_np and pthread_timedjoin_np functions. in the past
this has been only for checking; with 32-bit archs getting 64-bit
time_t it will also be necessary for symbols to get redirected
correctly.
---
 src/thread/pthread_join.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/thread/pthread_join.c b/src/thread/pthread_join.c
index b8813e02..17dae85d 100644
--- a/src/thread/pthread_join.c
+++ b/src/thread/pthread_join.c
@@ -1,3 +1,4 @@
+#define _GNU_SOURCE
 #include "pthread_impl.h"
 #include <sys/mman.h>
 
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