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.

diff --git a/src/thread/pthread_join.c b/src/thread/pthread_join.c
index b8813e0265e625946bd48dbdcc46cb925110e31c..17dae85d7086155a78b89052b6f0b551429a2987 100644 (file)
--- 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>