configure: error: Required OpenCL library not found!

[C493d]

I get this while running ./configure with the OpenCL option (checking for clGetPlatformIDs in -lOpenCL... no)

Any ideas how to fix this?

[Zdenko Podobny]

Install OpenCL?

Zdenko

po 29. 4. 2019 o 17:15 C493d <caged...@gmail.com> napísal(a):

I get this while running ./configure with the OpenCL option (checking for clGetPlatformIDs in -lOpenCL... no)

Any ideas how to fix this?

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[C493d]

I have the headers installed and the OpenCL files that come with CUDA

On Monday, 29 April 2019 18:17:00 UTC+3, zdenop wrote:

Install OpenCL?

Zdenko

po 29. 4. 2019 o 17:15 C493d <caged...@gmail.com> napísal(a):

I get this while running ./configure with the OpenCL option (checking for clGetPlatformIDs in -lOpenCL... no)

Any ideas how to fix this?

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[Zdenko Podobny]

Than try to set variable OPENCL_INC to opencl header directory (above CL/cl.h or OpenCL/cl.h)

If it does not help try to set  opencl header directory to AM_CPPFLAGS.

Zdenko

po 29. 4. 2019 o 17:24 C493d <caged...@gmail.com> napísal(a):

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[C493d]

I tried "export OPENCL_INC=/usr/include" and "export AM_CPPFLAGS=/usr/include/CL",
also tried changing inside configure.ac before running ./autogen.sh but no luck

On Monday, 29 April 2019 18:48:28 UTC+3, zdenop wrote:

Than try to set variable OPENCL_INC to opencl header directory (above CL/cl.h or OpenCL/cl.h)

If it does not help try to set  opencl header directory to AM_CPPFLAGS.

Zdenko

po 29. 4. 2019 o 17:24 C493d <caged...@gmail.com> napísal(a):

I have the headers installed and the OpenCL files that come with CUDA

On Monday, 29 April 2019 18:17:00 UTC+3, zdenop wrote:

Install OpenCL?

Zdenko

po 29. 4. 2019 o 17:15 C493d <caged...@gmail.com> napísal(a):

I get this while running ./configure with the OpenCL option (checking for clGetPlatformIDs in -lOpenCL... no)

Any ideas how to fix this?

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[C493d]

Also tried "CPPFLAGS+=-I/usr/include/CL/ ./configure --enable-opencl" didn't work either

[Zdenko Podobny]

Please provide output of:

ls -l  usr/include/CL 

+ attach (compressed) config.log

 

BTW:  if do not plan to contribute to OpenCL part of tesseract do not waste time with its compilation. It does not bring you expected speed increase  + there are long term not fixed issues (search issue tracked )

Zdenko

po 29. 4. 2019 o 20:23 C493d <caged...@gmail.com> napísal(a):

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[C493d]

Would it not increase inference speed? I'm looking for anything that may help with that

[C493d]

(base) compute@instance-1:~$ ls -l  /usr/include/CL

total 840

-rw-r--r-- 1 root root  75474 Feb 21  2018 cl.h

-rw-r--r-- 1 root root 307101 Jan 25  2018 cl.hpp

-rw-r--r-- 1 root root 304701 Jan 25  2018 cl2.hpp

-rw-r--r-- 1 root root   5122 Feb 21  2018 cl_d3d10.h

-rw-r--r-- 1 root root   5116 Feb 21  2018 cl_d3d11.h

-rw-r--r-- 1 root root   5421 Feb 21  2018 cl_dx9_media_sharing.h

-rw-r--r-- 1 root root   7858 Feb 21  2018 cl_dx9_media_sharing_intel.h

-rw-r--r-- 1 root root   5358 Feb 21  2018 cl_egl.h

-rw-r--r-- 1 root root  28709 Feb 23  2018 cl_ext.h

-rw-r--r-- 1 root root  19862 Feb 21  2018 cl_ext_intel.h

-rw-r--r-- 1 root root   7583 Feb 21  2018 cl_gl.h

-rw-r--r-- 1 root root   2869 Feb 21  2018 cl_gl_ext.h

-rw-r--r-- 1 root root  47247 Feb 23  2018 cl_platform.h

-rw-r--r-- 1 root root   7594 Feb 21  2018 cl_va_api_media_sharing_intel.h

-rw-r--r-- 1 root root   1993 Feb 21  2018 opencl.h

[Zdenko Podobny]

Simple answer is yes and no. Yes it will increase speed of some function related to image reading (AFAIR only for tiff) and processing, but not for OCR (the slowest part of whole process). And you will face new issues.

Search forums (user and dev) and issue tracker for more details.

Zdenko

po 29. 4. 2019 o 22:25 C493d <caged...@gmail.com> napísal(a):

Would it not increase inference speed? I'm looking for anything that may help with that

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[Zdenko Podobny]

Ok. Header file are correctly found, but test program is not able to find opencl library for linking:

/usr/bin/ld: cannot find -lOpenCL

Zdenko

po 29. 4. 2019 o 22:43 C493d <caged...@gmail.com> napísal(a):

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[C493d]

/usr/bin/ld: cannot find -lOpenCL

How can I fix this? Any parameter I can pass? 

[Zdenko Podobny]

this means that linker is not able to find opencl library...

Do you know nvidia opencl library and its location?

Zdenko

st 1. 5. 2019 o 12:56 C493d <caged...@gmail.com> napísal(a):

/usr/bin/ld: cannot find -lOpenCL

How can I fix this? Any parameter I can pass? 

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[C493d]

Yes, I made a symbolic link from it to /usr/include/CL which is why it's strange tesseract can't find it
(it was at /usr/local/cuda-10.0/targets/x86_64-linux/include/CL)

On Wednesday, 1 May 2019 14:37:16 UTC+3, zdenop wrote:

this means that linker is not able to find opencl library...

Do you know nvidia opencl library and its location?

Zdenko

st 1. 5. 2019 o 12:56 C493d <caged...@gmail.com> napísal(a):

/usr/bin/ld: cannot find -lOpenCL

How can I fix this? Any parameter I can pass? 

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[JB Data31]

If my memories are goods you have to combine 2 options :

-L <the path of the libs>

-l <"the name" of the lib>, "the name" because -lxxx correspond to a file libxxx.a or libxxx.so, depend on static or dynamic file.

-lOpenCL correspond to a file libopencl.[a,so] , did you do the case-insensitive command find / -iname "*opencl*" -print to locate the lib file ?

@JBΔ

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[jbda...@gmail.com]

I need to compile, by the way I use OpenCL.

My roadact on Ubuntu:

sudo apt-get install opencl-headers

sudo apt install ocl-icd-opencl-dev

export LDFLAGS=-L/usr/lib/x86_64-linux-gnu

./configure --enable-debug --enable-opencl

...

Configuration is done.
You can now build and install tesseract by running:

Make fails when linking because there is no CUDA (Virtual Machine for me) but your CUDA is OK, so...

JB.

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[C493d]

Thanks, I found it under /usr/local/cuda-10.0/targets/x86_64-linux/lib/ and added it "export LDFLAGS=-L/usr/local/cuda-10.0/targets/x86_64-linux/lib/" worked