ENH: LibSVM silent unless OTB_SHOW_ALL_MSG_DEBUG is on

Modules/Core/Common/include/otbUtils.h

@@ -48,6 +48,9 @@ namespace Utils
     return s.str();
   }
 
+  /** Function that prints nothing (usefull to disable libsvm logs)*/
+  void OTBCommon_EXPORT PrintNothing(const char *s);
+
 }
 
 } // namespace otb

Modules/Core/Common/src/otbUtils.cxx

@@ -37,6 +37,10 @@ bool IsLonLatValid(double lon, double lat)
   return true;
 }
 
+void PrintNothing(const char * /* s */)
+{
+}
+
 }
 
 }

Modules/Learning/Supervised/include/otbLibSVMMachineLearningModel.txx

@@ -26,6 +26,7 @@
 #include "otbSVMCrossValidationCostFunction.h"
 #include "otbExhaustiveExponentialOptimizer.h"
 #include "otbMacro.h"
+#include "otbUtils.h"
 
 namespace otb
 {
@@ -65,6 +66,9 @@ LibSVMMachineLearningModel<TInputValue,TOutputValue>
   this->m_Problem.l = 0;
   this->m_Problem.y = ITK_NULLPTR;
   this->m_Problem.x = ITK_NULLPTR;
+#ifndef OTB_SHOW_ALL_MSG_DEBUG
+  svm_set_print_string_function(&otb::Utils::PrintNothing);
+#endif
 }
 
 template <class TInputValue, class TOutputValue>