Try to fix MAC link error

DDTest/CMakeLists.txt

@@ -15,8 +15,9 @@ add_library(DD4hep::DDTest ALIAS DDTest)
 dd4hep_use_python_executable()
 target_include_directories(DDTest INTERFACE include)
 
+##    test_example
+
 foreach(TEST_NAME
-    test_example
     test_bitfield64
     test_bitfieldcoder
     test_DetType

DDTest/src/test_cellDimensions.cc

@@ -13,10 +13,10 @@
 #include <cmath>
 
 
-static dd4hep::DDTest test( "CellDimensions" ) ;
+int main() {
 
+  dd4hep::DDTest test( "CellDimensions" ) ;
 
-int main() {
   try{
 
     dd4hep::DDSegmentation::CartesianGridXY seg("system:8,barrel:3,layer:8,slice:5,x:16,y:16");

DDTest/src/test_segmentationHandles.cc

@@ -13,12 +13,14 @@
 #include <cmath>
 
 
-static dd4hep::DDTest test( "CellDimensions" ) ;
 using namespace dd4hep;
 using namespace dd4hep::detail;
 //using dd4hep::DDSegmentation::BitFieldCoder;
 
 int main() {
+
+  dd4hep::DDTest test( "CellDimensions" );
+
   try{
     BitFieldCoder bf("system:8,barrel:3,layer:8,slice:5,x:16,y:16");
     Segmentation base("CartesianGridXY","Test",&bf);