tesseract training tools under msys2/mingw64 don't build

[djusHa]

Hi,

building training tools in current master branch under MSYS2/mingw64 throws following Error:
...x86_64-w64-mingw32/bin/ld.exe: cannot find -licui18n

It seems the lib is named differently.

My quick Solution is to change libicu in training/Makefile like so:
sed -i 's/^libicu = -licui18n -licuuc/libicu = -licuin -licuuc/' training/Makefile

Then it's building fine.

Thanks for your awesome Work.

[zdenop]

Can you try revert this 7755e05 ?

[stweil]

Current Mingw-w64 as included in Cygwin includes these libraries in package mingw64-x86_64-icu: libicudata.dll.a libicui18n.dll.a libicuio.dll.a libicule.dll.a libiculx.dll.a libicutest.dll.a libicutu.dll.a libicuuc.dll.a, so that should work. It looks as if you got an older version of icu. Which version of Mingw-w64 did you use?

[stweil]

@zdenop, reverting that commit will work with old versions of icu. We don't support them for Linux, and for Windows there are also newer versions available. If support for both old and new versions is required, we need a test in configure.

[djusHa]

@stweil
where can i see the version of mingw-w64?

Ouput from mingw64 console:
$ uname -rv
2.6.0(0.304/5/3) 2016-09-07 20:45

Output from pacman:
$ pacman -Qs icu
local/icu 56.1-1 (libraries)
International Components for Unicode library
local/icu-devel 56.1-1 (development)
ICU headers and libraries
local/mingw-w64-x86_64-icu 57.1-1
International Components for Unicode library (mingw-w64)

This files: libicudata.dll.a libicui18n.dll.a libicuio.dll.a libicule.dll.a libiculx.dll.a libicutest.dll.a libicutu.dll.a libicuuc.dll.a seems to be present in '/usr/lib'

My host is Windows 7 x64, msys2 installed a few days ago, must be pretty up to date.

[stweil]

If you use MSYS / MinGW from http://www.mingw.org/, then even the latest installation is old. :-(
That packages are not suitable for builds of Tesseract (old libraries, old compiler, only 32 bit). Don't use them for Tesseract 4.

Use Mingw-w64 from https://mingw-w64.org/ or install Cygwin from https://cygwin.com/ with the mingw64-* packages. Both solutions allow building 32 or 64 bit Tesseract for Windows.

[djusHa]

I'm using MSYS2 Installer from https://msys2.github.io/
Have no Problems to compile other Linux Packages...

[stweil]

I'll have a look tomorrow. Good night for today.

[djusHa]

ok, good night.

[stweil]

msys2.github.io provides a recent package mingw64/mingw-w64-x86_64-icu 57.1-1 with these libraries in /mingw64/lib:

libicudt.dll.a  libicuin.dll.a    libicuio.dll.a  libicule.dll.a
libiculx.dll.a  libicutest.dll.a  libicutu.dll.a  libicuuc.dll.a

This results in the reported build error.

Cygwin has a package mingw64-x86_64-icu 57.1-2 with these files in /usr/x86_64-w64-mingw32/sys-root/mingw/lib:

libicudata.dll.a  libicuio.dll.a  libiculx.dll.a    libicutu.dll.a
libicui18n.dll.a  libicule.dll.a  libicutest.dll.a  libicuuc.dll.a

Note that the versions are nearly identical. I was wrong when I thought that it was a problem of old versions of libicu. We need a configure which supports both variants. I'll send a PR.

[stweil]

PR #572 addresses all issues which I had with the MSYS2 Installer from https://msys2.github.io/.

[djusHa]

Thanks for your effort!

[stweil]

@djusHa, the latest version in git includes the changes now. Don't forget to run ./autogen.sh before trying a new build.

[djusHa]

Thumbs up! :-)

It compiles fine now.
Even with the PKGBUILD from Tesseract Wiki:
https://github.com/tesseract-ocr/tesseract/wiki/Compiling#msys2

Thanks for fixing.