fix(eoParallel): declutch _t_start under _OPENMP

eo/src/utils/eoParallel.cpp

@@ -39,8 +39,10 @@ eoParallel::eoParallel() :
     _nthreads( 0, "parallelize-nthreads", "Define the number of threads you want to use, nthreads = 0 means you want to use all threads available", '\0' ),
     _enableResults( false, "parallelize-enable-results", "Enable the generation of results", '\0' ),
     _doMeasure( false, "parallelize-do-measure", "Do some measures during execution", '\0' ),
-    _packetSize( 1U, "parallelize-packet-size", "Number of elements which should be sent in a single message during a parallel evaluation based on message passing.", '\0'),
-    _t_start(0)
+    _packetSize( 1U, "parallelize-packet-size", "Number of elements which should be sent in a single message during a parallel evaluation based on message passing.", '\0')
+#ifdef _OPENMP
+    , _t_start(0)
+#endif
 {
 }
 

eo/src/utils/eoParallel.h

@@ -71,7 +71,9 @@ private:
     eoValueParam<bool> _enableResults;
     eoValueParam<bool> _doMeasure;
     eoValueParam<unsigned int> _packetSize;
+#ifdef _OPENMP
     double _t_start;
+#endif
 };
 
 void make_parallel(eoParser&);