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Compile Tesseract for iOS

Steps to compile Tesseract lib and dependencies for iOS version only

Prepreapre libs

brew install automake autoconf autoconf-archive libtool pkgconfig icu4c leptonica gcc cairo pango icu4c autoconf libffi libarchive wget
export PKG_CONFIG_PATH=\
$(brew --prefix)/lib/pkgconfig:\
$(brew --prefix)/opt/libarchive/lib/pkgconfig:\
$(brew --prefix)/opt/icu4c/lib/pkgconfig:\
$(brew --prefix)/opt/libffi/lib/pkgconfig

Step 1

Open Terminal app and run the following commands:

mkdir -p dependencies/include
mkdir -p dependencies/lib
cp -R ./include/curl/  dependencies/include/curl/
cp -rvf include/libcurl.a  dependencies/lib/libcurl.a

Step 2 Download Tesseract

download tesseract at https://github.com/tesseract-ocr/tesseract then rename like tesseract_4.1.1 at root folder

Step 3 Download leptonica

download leptonica at http://leptonica.org/download.html then rename like leptonica_1.79.0 at root folder

Step 4 Change version of leptonica, tesseract and dependencies (png, jpeg,..) in include/config.mk

IOS_DEPLOY_TGT 		= "8.0"
PNG_VERSION 		= 1.6.37
TIFF_VERSION    	= 4.1.0
LEPT_VERSION		= 1.79.0
JPEG_VERSION		= 9c
TESSERACT_VERSION 	= 4.1.1

Step 5 Edit in file tesseract/configure.ac

AX_CHECK_COMPILE_FLAG([-mavx], [avx=true], [avx=false], [$WERROR])
=> AX_CHECK_COMPILE_FLAG([-mavx], [avx=false], [avx=false], [$WERROR])

AX_CHECK_COMPILE_FLAG([-mfma], [fma=true], [fma=false], [$WERROR])
=>AX_CHECK_COMPILE_FLAG([-mfma], [fma=false], [fma=false], [$WERROR])

AX_CHECK_COMPILE_FLAG([-msse4.1], [sse41=true], [sse41=false], [$WERROR])
=>AX_CHECK_COMPILE_FLAG([-msse4.1], [sse41=false], [sse41=false], [$WERROR])

AX_CHECK_COMPILE_FLAG([-mavx2], [avx2=true], [avx2=false], [$WERROR])
=>AX_CHECK_COMPILE_FLAG([-mavx2], [avx2=false], [avx2=false], [$WERROR])

PKG_CHECK_MODULES([libcurl], [libcurl], [have_libcurl=true], [have_libcurl=false])
=>PKG_CHECK_MODULES([libcurl], [libcurl], [have_libcurl=false], [have_libcurl=false])

Step 6 Fix "_opendir$INODE64" not found

copy fix_opendir_INODE64.c to leptonica/src
include file to  leptonica/sarray1.c
#include "fix_opendir_INODE64.c"

Step 7 Fix 'curl/curl.h' file not found (Because the curl already included so this step may be not neccessary, but in case you have such error please replace my curl lib with your own curl lib)

download curl https://curl.haxx.se/download.html
then configure it to a another destination folder    
./configure --prefix=/path/to/destination/
`xcode-select -p`/usr/bin/make -sj8 
`xcode-select -p`/usr/bin/make install

copy file lib/lcurl.a to dependencies/lib
copy curl src folder to dependencies/include/curl

Step 8

Run make in libtiff-ios folder

Step 9

Run make in foot folder

NOTE when compiling, if such error occurs

configure: error: C++ compiler cannot create executables        
For example:    
cd /Users/trung.nv/Desktop/trungnv/demo/tesseract-ios/make/tesseract-4.1.1/x86_64-apple-darwin ; \
ln -s /Users/trung.nv/Desktop/trungnv/demo/tesseract-ios/make/leptonica-1.79.0/src/ leptonica ; \
../configure --host=x86_64-apple-darwin --prefix=`pwd` --enable-shared=no --disable-graphics

copy the error command to another terminal tab and run

Fix "Leptonica 1.74 or higher is required. Try to install libleptonica-dev package".

brew link --overwrite --dry-run leptonica

Fix "fatal error: 'allheaders.h' file not found", remember to specify version of tesseract and leptonica installed

PKG_CONFIG_PATH="$PKG_CONFIG_PATH:/usr/local/Cellar/leptonica/1.79.0/lib/pkgconfig" PKG_CONFIG_PATH="$PKG_CONFIG_PATH:/usr/local/Cellar/tesseract/4.1.1/lib/pkgconfig"

Thanks for

https://github.com/kenticomartinh/Tesseract-OCR-iOS/tree/4.1 https://github.com/tesseract-ocr/tesseract