From da5d5a5d4e28bdf15c5db6fac73dd3005bf89c72 Mon Sep 17 00:00:00 2001
From: Arvid Norberg <arvid@libtorrent.org>
Date: Sat, 5 Apr 2008 05:36:18 +0000
Subject: [PATCH] added option to include librt (for 64 bit linux systems)

---
 Jamfile            |  7 ++++---
 docs/building.html | 10 ++++++++++
 docs/building.rst  |  6 ++++++
 3 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/Jamfile b/Jamfile
index 4caec8e60..9b259de8d 100755
--- a/Jamfile
+++ b/Jamfile
@@ -76,10 +76,9 @@ rule linking ( properties * )
 	}
 
 	# clock_gettime on linux requires librt
-	if <target-os>linux in $(properties)
+	if <need-librt>yes in $(properties)
 	{
-# when do one need to link against librt?
-#		result += <library>rt ;
+		result += <library>rt ;
 	}
 
 	if <boost>system in $(properties)
@@ -159,6 +158,8 @@ rule building ( properties * )
 	return $(result) ;
 }
 
+feature need-librt : no yes : composite propagated link-incompatible ;
+
 feature geoip : off static shared : composite propagated link-incompatible ;
 feature.compose <geoip>off : <define>TORRENT_DISABLE_GEO_IP ;
 
diff --git a/docs/building.html b/docs/building.html
index 5f4977f4f..68d6a9613 100644
--- a/docs/building.html
+++ b/docs/building.html
@@ -231,6 +231,16 @@ logging of the DHT protocol traffic.</li>
 </ul>
 </td>
 </tr>
+<tr><td><tt class="docutils literal"><span class="pre">need-librt</span></tt></td>
+<td><ul class="first last simple">
+<li><tt class="docutils literal"><span class="pre">no</span></tt> - this platform does not need to link
+against librt to have POSIX time functions.</li>
+<li><tt class="docutils literal"><span class="pre">yes</span></tt> - specify this if your linux system
+requires you to link against librt.a. This is
+typically the case on x86 64 bit systems.</li>
+</ul>
+</td>
+</tr>
 <tr><td><tt class="docutils literal"><span class="pre">zlib</span></tt></td>
 <td><ul class="first last simple">
 <li><tt class="docutils literal"><span class="pre">system</span></tt> - links against the zlib supplied
diff --git a/docs/building.rst b/docs/building.rst
index 18b735ba5..cbcf1dd31 100644
--- a/docs/building.rst
+++ b/docs/building.rst
@@ -230,6 +230,12 @@ Build features:
 |                        |   logging of the DHT protocol traffic.             |
 |                        | * ``off`` - build without DHT support.             |
 +------------------------+----------------------------------------------------+
+| ``need-librt``         | * ``no`` - this platform does not need to link     |
+|                        |   against librt to have POSIX time functions.      |
+|                        | * ``yes`` - specify this if your linux system      |
+|                        |   requires you to link against librt.a. This is    |
+|                        |   typically the case on x86 64 bit systems.        |
++------------------------+----------------------------------------------------+
 | ``zlib``               | * ``system`` - links against the zlib supplied     |
 |                        |   with your operating system.                      |
 |                        | * ``shipped`` - links against the zlib bundled     |