From 0226150f3bfaf0829cff7b074d5ee8254129dc2c Mon Sep 17 00:00:00 2001
From: tetzank <tetzank@users.sourceforge.net>
Date: Sun, 13 Oct 2019 22:40:00 +0200
Subject: [PATCH] use own gettid() only for older glibc versions

gettid() is provided in glibc since version 2.30. Detect the glibc version
with a macro and only define our own gettid() when glibc version < 2.30.
---
 libcoz/ccutil/thread.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/libcoz/ccutil/thread.h b/libcoz/ccutil/thread.h
index d0f00b6..5ab8989 100644
--- a/libcoz/ccutil/thread.h
+++ b/libcoz/ccutil/thread.h
@@ -1,6 +1,11 @@
 #if !defined(CCUTIL_THREAD_H)
 #define CCUTIL_THREAD_H
 
+// gettid() is provided by glibc since version 2.30
+// only create our own implementation for older glibc versions
+#include <features.h>
+#if !__GLIBC_PREREQ(2,30)
+
 #include <sys/syscall.h>
 
 static inline pid_t gettid() {
@@ -8,3 +13,5 @@ static inline pid_t gettid() {
 }
 
 #endif
+
+#endif