Fix order of destructor calls for DawgCache and TessBaseAPI

TessBaseAPI must release its cache use before DawgCache is destroyed.

Signed-off-by: Stefan Weil <sw@weilnetz.de>

api/tesseractmain.cpp

@@ -27,6 +27,7 @@
 #include "allheaders.h"
 #include "baseapi.h"
 #include "basedir.h"
+#include "dict.h"
 #include "openclwrapper.h"
 #include "osdetect.h"
 #include "renderer.h"
@@ -425,6 +426,11 @@ int main(int argc, char** argv) {
 
   PERF_COUNT_START("Tesseract:main")
 
+  // Call GlobalDawgCache here to create the global DawgCache object before
+  // the TessBaseAPI object. This fixes the order of destructor calls:
+  // first TessBaseAPI must be destructed, DawgCache must be the last object.
+  tesseract::Dict::GlobalDawgCache();
+
   // Avoid memory leak caused by auto variable when exit() is called.
   static tesseract::TessBaseAPI api;