From 3dcb3c95ea4e9561a8da9c9256ce1148aa571b63 Mon Sep 17 00:00:00 2001
From: zrj <rimvydas.jasinskas@gmail.com>
Date: Wed, 2 May 2018 16:18:32 +0300
Subject: [PATCH] gcc80: Add alternative variant of pthread presence checking.

Port the 5f76495ba37ea12fb60cf57228cc78b83d889fb from gcc50.
---
 contrib/gcc-8.0/libgcc/gthr-posix.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/contrib/gcc-8.0/libgcc/gthr-posix.h b/contrib/gcc-8.0/libgcc/gthr-posix.h
index e2f952f6c1..cdc8b2a9cb 100644
--- a/contrib/gcc-8.0/libgcc/gthr-posix.h
+++ b/contrib/gcc-8.0/libgcc/gthr-posix.h
@@ -209,6 +209,30 @@ __gthread_active_p (void)
   return __gthread_active_latest_value != 0;
 }
 
+#elif defined(__DragonFly__) && defined(_AVOID_WEAKREF)
+
+/*
+ * On DragonFly libpthread always brings libc so __isthreaded is available.
+ * __isthreaded is a special variable that is set by libpthread lib.
+ * Mainly for libgcc_pic.a usage case, ld.gold is not ready to handle such
+ * static relocatable lib in pthread+cxx shared lib linkages.
+ * Everything else should use weakref on pthread_cancel below.
+ */
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+extern int __isthreaded; /* from libc */
+#if defined(__cplusplus)
+}
+#endif
+
+static inline int
+__gthread_active_p (void)
+{
+  return (__isthreaded != 0);
+}
+
 #else /* neither FreeBSD nor Solaris */
 
 /* For a program to be multi-threaded the only thing that it certainly must
-- 
2.41.0