Add an option to compile tesseract without the code of the legacy OCR engine

Author: amitdo

configure.ac

@@ -161,6 +161,20 @@ if test "$enable_graphics" = "no"; then
   AM_CONDITIONAL([GRAPHICS_DISABLED], true)
 fi
 
+AC_MSG_CHECKING([--enable-legacy argument])
+AC_ARG_ENABLE([legacy],
+  [
+    AS_HELP_STRING([--enable-legacy],[enable the legacy OCR engine])
+    AS_HELP_STRING([--disable-legacy], [disable the legacy OCR engine])
+  ],
+  [enable_legacy=$enableval],
+  [enable_legacy="yes"])
+AC_MSG_RESULT([$enable_legacy])
+if test "$enable_legacy" = "no"; then
+  AC_DEFINE([DISABLED_LEGACY_ENGINE], [], [Disable the legacy OCR engine])
+fi
+AM_CONDITIONAL([DISABLED_LEGACY_ENGINE], test "$enable_legacy" = "no")
+
 # check whether to build embedded version
 AC_MSG_CHECKING([--enable-embedded argument])
 AC_ARG_ENABLE([embedded],

doc/Makefile.am

@@ -4,27 +4,32 @@ if ASCIIDOC
 
 asciidoc=asciidoc -d manpage
 
+
 man_MANS = \
-  ambiguous_words.1 \
-  classifier_tester.1 \
-  cntraining.1  \
-  combine_lang_model.1 \
+   combine_lang_model.1 \
   combine_tessdata.1  \
   dawg2wordlist.1 \
   lstmeval.1 \
   lstmtraining.1 \
   merge_unicharsets.1 \
-  mftraining.1  \
   set_unicharset_properties.1 \
-  shapeclustering.1 \
   tesseract.1 \
   text2image.1 \
   unicharambigs.5 \
-  unicharset.5 \
-  unicharset_extractor.1  \
+  unicharset_extractor.1 \
   wordlist2dawg.1 
-  
-  EXTRA_DIST = $(man_MANS) Doxyfile
+
+if !DISABLED_LEGACY_ENGINE
+man_MANS += \
+  ambiguous_words.1 \
+  classifier_tester.1 \
+  cntraining.1 \
+  mftraining.1 \
+  shapeclustering.1 \
+  unicharset.5
+endif
+
+EXTRA_DIST = $(man_MANS) Doxyfile
 
 %: %.asc
 	$(asciidoc) -o $@ $<