Put Torch importer implementation under ifdef

modules/dnn/src/torch/THFile.h

@@ -2,6 +2,7 @@
 #define TH_FILE_INC
 
 //#include "THStorage.h"
+#if defined(ENABLE_TORCH_IMPORTER) && ENABLE_TORCH_IMPORTER
 #include "THGeneral.h"
 
 typedef struct THFile__ THFile;
@@ -84,4 +85,5 @@ TH_API long THFile_position(THFile *self);
 TH_API void THFile_close(THFile *self);
 TH_API void THFile_free(THFile *self);
 
-#endif
+#endif //defined(ENABLE_TORCH_IMPORTER) && ENABLE_TORCH_IMPORTER
+#endif //TH_FILE_INC

modules/dnn/src/torch/torch_importer.cpp

@@ -49,7 +49,7 @@
 
 namespace cv {
 namespace dnn {
-
+#if defined(ENABLE_TORCH_IMPORTER) && ENABLE_TORCH_IMPORTER
 #include "THDiskFile.h"
 
 #ifdef NDEBUG
@@ -964,6 +964,14 @@ Blob readTorchBlob(const String &filename, bool isBinary)
 
     return importer->tensors.begin()->second;
 }
+#else
+
+Ptr<Importer> createTorchImporter(const String &filename, bool isBinary)
+{
+    CV_Error(Error::StsNotImplemented, "Torch importer is disabled in current build");
+    return Ptr<Importer>();
+}
 
+#endif //defined(ENABLE_TORCH_IMPORTER) && ENABLE_TORCH_IMPORTER
 }
 }