From 6096eb2db483cddd2211b9d8bc96298a38ac3169 Mon Sep 17 00:00:00 2001
From: Willem Jan Palenstijn <Willem.Jan.Palenstijn@cwi.nl>
Date: Fri, 20 Feb 2015 18:00:03 +0100
Subject: Check if we need librt for clock_gettime in configure script

---
 build/linux/Makefile.in  |  3 ++-
 build/linux/configure.ac | 28 ++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/build/linux/Makefile.in b/build/linux/Makefile.in
index 685e1e5..5b4c9fa 100644
--- a/build/linux/Makefile.in
+++ b/build/linux/Makefile.in
@@ -19,10 +19,11 @@ VPATH=../..
 CPPFLAGS=@SAVED_CPPFLAGS@
 CXXFLAGS=@SAVED_CXXFLAGS@
 LDFLAGS=@SAVED_LDFLAGS@
+LIBS=@SAVED_LIBS@
 
 CPPFLAGS+=-I../.. -I../../include -I../../lib/include/rapidxml
 CXXFLAGS+=-g -O3 -Wall -Wshadow
-LIBS=-lpthread -lrt
+LIBS+=-lpthread
 LDFLAGS+=-g
 
 ifeq ($(cuda),yes)
diff --git a/build/linux/configure.ac b/build/linux/configure.ac
index f99c4d3..cbf6016 100644
--- a/build/linux/configure.ac
+++ b/build/linux/configure.ac
@@ -31,6 +31,7 @@ LT_INIT([disable-static])
 SAVED_CPPFLAGS="$CPPFLAGS"
 SAVED_CXXFLAGS="$CXXFLAGS"
 SAVED_LDFLAGS="$LDFLAGS"
+SAVED_LIBS="$LIBS"
 
 AC_CANONICAL_BUILD
 AC_CANONICAL_HOST
@@ -47,6 +48,32 @@ dnl Use iostream to check if the C++ compiler works
 AC_CHECK_HEADER(iostream, , AC_MSG_ERROR([No working c++ compiler found]))
 
 
+# clock_gettime
+
+AC_MSG_CHECKING([for clock_gettime])
+AC_TRY_LINK([
+#include <ctime>
+],[
+struct timespec t; clock_gettime(CLOCK_REALTIME, &t);
+],astra_clock_gettime_ok=yes,astra_clock_gettime_ok=no)
+AC_MSG_RESULT($astra_clock_gettime_ok)
+if test x$astra_clock_gettime_ok = xno; then
+  AC_MSG_CHECKING([for clock_gettime in librt])
+  LIBS="$LIBS -lrt"
+  AC_TRY_LINK([
+  #include <ctime>
+  ],[
+  struct timespec t; clock_gettime(CLOCK_REALTIME, &t);
+  ],astra_clock_gettime_ok=yes,astra_clock_gettime_ok=no)
+  AC_MSG_RESULT($astra_clock_gettime_ok)
+  if test x$astra_clock_gettime_ok = xno; then
+    AC_MSG_ERROR([No clock_gettime found])
+  else
+    SAVED_LIBS="$SAVED_LIBS -lrt"
+  fi
+fi
+
+
 # boost-unit-test-framework
 
 AC_MSG_CHECKING([for boost-unit-test-framework])
@@ -179,6 +206,7 @@ AC_SUBST(HAVEMATLAB)
 AC_SUBST(SAVED_CPPFLAGS)
 AC_SUBST(SAVED_CXXFLAGS)
 AC_SUBST(SAVED_LDFLAGS)
+AC_SUBST(SAVED_LIBS)
 
 
 AC_CONFIG_FILES([Makefile])
-- 
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