From 98954984a4b55d01380bd8f18c884dc8519133ea Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ion=20Gazta=C3=B1aga?= <igaztanaga@gmail.com>
Date: Sat, 10 Jun 2017 23:59:48 +0200
Subject: [PATCH] Avoid link-time chrono dependencies

timer used to be independent from chrono. The tiny dependency used in the implementation can be isolated defining BOOST_CHRONO_HEADER_ONLY
---
 src/cpu_timer.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/cpu_timer.cpp b/src/cpu_timer.cpp
index 49a6174..a284e48 100644
--- a/src/cpu_timer.cpp
+++ b/src/cpu_timer.cpp
@@ -13,6 +13,10 @@
 // the library is being built (possibly exporting rather than importing code)
 #define BOOST_TIMER_SOURCE
 
+// define BOOST_CHRONO_HEADER_ONLY so that chrono dependencies are not
+// propagated to library users
+#define BOOST_CHRONO_HEADER_ONLY
+
 #include <boost/timer/timer.hpp>
 #include <boost/chrono/chrono.hpp>
 #include <boost/io/ios_state.hpp>