RFC: Remove tessdata directory and replace it by a submodule

[stweil]

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

[stweil]

This is for further discussion.

The tessdata subdirectory is now filled with data from https://github.com/tesseract-ocr/tessconfigs which is included as a submodule, so for people who just clone the tesseract repository it is empty. Therefore tessdata is no longer included in the build process as a subdirectory, and make install currently does not install tessdata files. There is a new Makefile target: make install-tessdata will install that or fail if the submodule was not cloned.

[stweil]

The problems with AppVeyor look unrelated to my modifications.

[amitdo]

Why? I don't see the benefit here.
IMO, It's just complicating the setup for the poor user.

[zdenop]

@amitdo: poor user do not use git ;-) IMO this it start of "rethinking" what is the best way of tesseract distribution. From tessdata only pdf.ttf is really needed (maybe it could be compiled into library???).
Personally I would prefer splitting this project (repository) to more individual parts, that could be consolidated into one repository (for poor users ;-) ). There are at least 3 parts that could exists separately:

• libtesseract
• tesseract executable
• tesseract training tools

[amitdo]

@stweil, if you still want to do it, go ahead. Otherwise, maybe it's time to close this PR.

[amitdo]

@stweil,

#2459 (comment)