Posts Tagged ‘crosscompile’

Compiling tesseract v3 for iPhone

Friday, September 24th, 2010

Update 2: Before using the script, ensure that you can build tesseract for your host system normally. Also, I only tested the script with the v3 release of tesseract, not svn HEAD. If you get build errors, please try with rev 498.

Update: The script has been updated, thanks mostly to the prompting of fopen2003 in the comments below. I’ve successfully tested the resulting libs in both Simulator and an iPhone 4 (both at iOS4.x) using the PocketOCR project.

After many requests, I finally got around to looking into updating the build script to cross-compile tesseract ocr v3 for use with iPhone. Here’s the script. It seems to build the static, fat library without error. I haven’t tried to update my app to use it yet, so I really don’t know if it even works. Let me know in the comments if it actually does indeed work.

  1. Check out the svn source of tesseract: http://code.google.com/p/tesseract-ocr/source/checkout
  2. Copy this script into the source directory and run from there
  3. Profit???

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cross-compiling for iPhone dev

Wednesday, July 15th, 2009

Update: Proof-of-concept demo. Also, updated the script for building with the 10.6 SDK.

Update #2: Source code for demo project released.

Update #3: script for use with tesseract v3 posted.

I recently had need to use an open-source library in an iPhone project. Recalling the earlier work necessary in compiling the libraries needed for openFrameworks I started looking for a more generic way to build for iPhone development. Thankfully, LateNiteSoft wrote a great article about using a shell script to cross-compile linux projects, building a Universal Binary with versions for the Simulator and Device.

I configured their provided code snippets to build tesseract-ocr for iPhone, referring to the set-up for freetype and freeimage to fill in some c++ gaps. Anyway, the library seems to have built correctly. I’ll know for sure when I incorporate it into a project, soon.

To use it, copy the script into the project directory, next to the configure script. For a simple project which generates one monolithic library, edit the LIBFILE variable to reflect the location and name of the library. I’ve only used this for static libraries…other work may be necessary to correctly generate dynamic libraries (however, the iPhone SDK prohibits linking to dynamic libraries, so in this case it seems moot). Run ./build_fat.sh to kick off the process. Look for the compiled libraries in the “lnsout” directory. There’s no error checking, so caveat emptor. :)

Cross-compile shell script follows: (more…)