Tesseract: cannot ./configure if leptonica builded from source

[wosiu]

If you build and install leptonica from a source, then libleptonica.so is created, but not liblept.so
However tesseract ./configure scripts requires liblept.so:

(...)
checking for leptonica... yes
checking for pixCreate in **-llept**... no
configure: error: leptonica library missing

As a workaround I just link liblept.so to created libleptonica.so, but I belive that tesseract scripts should recognize if we have liblept or libleptonica installed and use proper -l... flag for pixCreate.
Note that liblept.so is installed when you install leptonica from debian/ubuntu repository by e.g. apt-get install. Btw maybe it should be also fixed by leptonica guys to standarize library name no matter you build it by your own or install from repo (?).

[stweil]

Neither the stable version 3.05 nor git master tests for pixCreate.
Did you test with Tesseract 3.04 or older? Then please update to a supported version.

[wosiu]

Previously I checked out to a tag: 3.05.00dev
Now I've just checked to a branch: 3.05 - and now it passes ./configure script, but there is some new problem with make:

/usr/bin/ld: cannot find -lleptonica_OUTPUT_NAME-NOTFOUND
collect2: error: ld returned 1 exit status
make[2]: *** [libtesseract.la] Error 1
make[2]: Opuszczenie katalogu `/home/m/OCR/download/tesseract/api'
make[1]: *** [all-recursive] Error 1
make[1]: Opuszczenie katalogu `/home/m/OCR/download/tesseract'
make: *** [all] Error 2

And for branch 3.04 without liblept.so I get:

checking for leptonica... yes
checking for l_generateCIDataForPdf in -llept... no
configure: error: leptonica library with pdf support (>= 1.71) is missing
Line 122 - configure error

[zdenop]

What version of leptonica you use?
Did you run ./autogen.sh (in tesseract) before running ./configure ?

[wosiu]

1) leptonica 1.74.2 builded and installed from source
2) Yes, I run autogen before configure.
As I mentioned in 1st post: leptonica builded from source does not create liblept.so, instead it creates libleptonica.so.

[zdenop]

checking for l_generateCIDataForPdf in -llept... no

Do you have only one installation of leptonica in your system? Because current leptonica has this function.

leptonica builded from source does not create liblept.so, instead it creates libleptonica.so

I can not check it at the moment, but source code show liblept is output of compilation. How did you build leptonica?

[amitdo]

It seems that with CMake it's libleptonica.so

[stweil]

Commit f52d445074d0e3863dfbe4f0b6acbf92c0f46d7d changed the library handling to use pkg-config. The branch 3.05 includes that commit. Tesseract 3.05.00 still uses the old code.

[wosiu]

Thanks guys. To summarize:
Yes, I've got only 1 leptonica, and yes, when cmake is used then liblept.so is created instead of libleptonica.so (to be precise: cmake path/to/repo; make -j; sudo make install). For the same reason "checking for l_generateCIDataForPdf in -llept... no". But nevermind, because indeed f52d445 from 3.05 branch fixes liblept vs libleptonica. However as I mentioned some posts ago: when I use 3.05 or f52d445 I've got a problem with "make" which is connected again with leptonica.
But if you ask me, I'm satisfied with using 3.05.00 and just symlink liblept.so to libleptonica.so.

[Shreeshrii]

@zdenop Tagging 3.05.01 release will help.

[stweil]

@wosiu, the error /usr/bin/ld: cannot find -lleptonica_OUTPUT_NAME-NOTFOUND comes from an error in the Leptonica build. The string is part of lept.pc.cmake and should be replaced when lept.pc is generated. I'd try building Leptonica with configure / make instead of using cmake – maybe that fixes this problem.

[amitdo]

Try to build both leptonoica and tesseract with the same build system (cmake / autotools)

[amitdo]

https://github.com/DanBloomberg/leptonica/issues/253

[wosiu]

Now I build and install leptonica like this:

./autobuild
./configure
make -j 
sudo make install 

and indeed liblept.so is created.
However now during tesseract (branch 3.05) "make" I get:

/usr/bin/ld: tesseract-tesseractmain.o: undefined reference to symbol 'lept_free'
/usr/local/lib/liblept.so.5: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status

3.05.00 build is fine.

[DanBloomberg]

Does anyone have a solution to this problem without changing the debian version of the leptonica library soname (made with autotools), which is liblept.so?

[DanBloomberg]

@jbreiden

[stweil]

@DanBloomberg, I see no problem with the name of the library here. ./configure && make builds liblept.so which is fine. liblept.so also provides lept_free. @wosiu, do you compile for Linux or for Windows? Could you provide a complete build protocol?

[egorpugin]

Build leptonica with autotools, not cmake if you're using tess autotools. Otherwise use cmake+cmake build.