Compilation issue of Tesseract 3.05 on Ubuntu 17.04

[Arsen Hakobyan]

Hi All,

I think this should be opened as an issue but according to the guidelines I need to ask here before.

Please help me with a suggestion resolving the mentioned issue and whether I should open issue for this or not.

I am getting the following compilation errors during building the sources of 3.05 branch:

arsen@arsen:~/tesseract$ git status
On branch 3.05
Your branch is up-to-date with 'origin/3.05'.


Last log:
commit 555305f2be5e1ab27a3138f19d680f28d3922987
Merge: ed31db6 b66ff1f
Author: zdenop <zde...@gmail.com>
Date:   Sun Apr 23 17:40:01 2017 +0200

    Merge pull request #835 from stweil/3.05
   
    3.05: Backports from master branch


The Error:

make[2]: Entering directory '/home/arsen/tesseract/api'
/bin/bash ../libtool  --tag=CXX   --mode=link g++  -g -O2 -std=c++11   -o tesseract tesseract-tesseractmain.o libtesseract.la  -lrt -lpthread
libtool: link: g++ -g -O2 -std=c++11 -o .libs/tesseract tesseract-tesseractmain.o  ./.libs/libtesseract.so -lrt -lpthread
/usr/bin/ld: tesseract-tesseractmain.o: undefined reference to symbol 'lept_free'
//usr/lib/x86_64-linux-gnu/liblept.so.5: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
Makefile:601: recipe for target 'tesseract' failed
make[2]: *** [tesseract] Error 1
make[2]: Leaving directory '/home/arsen/tesseract/api'
Makefile:492: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory '/home/arsen/tesseract'
Makefile:401: recipe for target 'all' failed
make: *** [all] Error 2

I am trying to build on Ubuntu 17.04:

arsen@arsen:~/tesseract$ uname -a
Linux arsen 4.10.0-20-generic #22-Ubuntu SMP Thu Apr 20 09:22:42 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

Got the mentioned error.
I saw similar issues reported before and as one of them resolved by adding missing library i did same and currently compilation is successful at my side.

Here is the patch :

arsen@arsen:~/tesseract$ git diff
diff --git a/api/Makefile.am b/api/Makefile.am
index 531fb23..420bcbf 100644
--- a/api/Makefile.am
+++ b/api/Makefile.am
@@ -86,5 +86,5 @@ tesseract_LDADD += -lws2_32 -ltiff
 libtesseract_la_LDFLAGS += -no-undefined -Wl,--as-needed -lws2_32
 endif
 if ADD_RT
-tesseract_LDADD += -lrt
+tesseract_LDADD += -lrt -llept
 endif


After that I installed the Tesseract on my PC:

arsen@arsen:~/tesseract$ tesseract -v
tesseract 3.05.00
 leptonica-1.74.1
  libgif 5.1.4 : libjpeg 8d (libjpeg-turbo 1.5.1) : libpng 1.6.28 : libtiff 4.0.7 : zlib 1.2.11 : libwebp 0.5.2 : libopenjp2 2.1.2



Regards,
Arsen

[Shane Dev]

All,

 I have  successfully built leptonica-1.74.0 source on Ubuntu 16.04 LTS, now I am trying to build tesseract-3.05.01 from source, but make fails with the following error -

/bin/bash ../libtool  --tag=CXX   --mode=link g++  -g -O2 -std=c++11   -o tesseract tesseract-tesseractmain.o libtesseract.la  -lrt -lpthread

libtool: link: g++ -g -O2 -std=c++11 -o .libs/tesseract tesseract-tesseractmain.o  ./.libs/libtesseract.so -lrt -lpthread -Wl,-rpath -Wl,/home/sss/dev/c/tesseract-3.05.01/bin/lib

/usr/bin/ld: tesseract-tesseractmain.o: undefined reference to symbol 'lept_free'

//home/sss/dev/c/leptonica-1.74.0/bin/lib/liblept.so.5: error adding symbols: DSO missing from command line

collect2: error: ld returned 1 exit status

I checked my Makefile.am as suggested by Arsen below, but I could not find tesseract_LDADD += -lrt

Does any know how I can get around this error?

[Kevin Zhang]

The Makefile.am with the line is actually in the api folder. So look for line 89 in the file /api/Makefile.am and add -llept there.

[Zdenko Podobný]

It should be fixed in 3.05 branch.

Zdenko

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