update source to Ceph Pacific 16.2.2

[ceph.git] / ceph / src / boost / tools / build / src / engine / check_cxx11.cpp

diff --git a/ceph/src/boost/tools/build/src/engine/check_cxx11.cpp b/ceph/src/boost/tools/build/src/engine/check_cxx11.cpp
new file mode 100644 (file)
index 0000000..f01fcff
--- /dev/null
+++ b/ceph/src/boost/tools/build/src/engine/check_cxx11.cpp
@@ -0,0 +1,21 @@
+/*  Copyright 2020 Rene Rivera
+ *  Distributed under the Boost Software License, Version 1.0.
+ *  (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
+ */
+
+/*
+This program is a compile test for support of C++11. If it compiles
+successfully some key parts of C++11 the B2 engine requires are
+available. This is used by the build script to guess and check the
+compiler to build the engine with.
+*/
+
+// Some headers we depend on..
+#include <thread>
+
+
+int main()
+{
+    // Check for basic thread calls.
+    { auto _ = std::thread::hardware_concurrency(); }
+}