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I am trying to run a tool that uses Clang and LLVM. The tool name is cppgrep that is available with the docker. Please find it from the github repository - https://github.com/peter-can-talk/cppnow-2017. I have tried using Ubuntu 16.04 and 17.10, I got the same error as below:

root@522051d201d2:/home# ./cppgrep -help
./cppgrep: /usr/lib/x86_64-linux-gnu/libLLVM-4.0.so.1: version `LLVM_4.0' not found (required by ./cppgrep)
./cppgrep: /usr/lib/x86_64-linux-gnu/libclang-4.0.so.1: version `LLVM_4.0' not found (required by ./cppgrep)
root@522051d201d2:/home#

After some online search, I found that I had to setup the environment variable LD_LIBRARY_PATH. So as a first step I found the library files location in the docker, please find the output below:

root@522051d201d2:/home# find / -iname *libclang*.so*
/usr/lib/x86_64-linux-gnu/libclang-4.0.so
/usr/lib/x86_64-linux-gnu/libclang-4.0.so.1
/usr/lib/llvm-4.0/lib/libclang.so.1
/usr/lib/llvm-4.0/lib/libclang-4.0.so
/usr/lib/llvm-4.0/lib/libclang-4.0.0.so
/usr/lib/llvm-4.0/lib/libclang.so
/usr/lib/llvm-4.0/lib/libclang-4.0.so.1
/usr/lib/llvm-4.0/lib/clang/4.0.0/lib/linux/libclang_rt.dyndd-x86_64.so
/usr/lib/llvm-4.0/lib/clang/4.0.0/lib/linux/libclang_rt.asan-i686.so
/usr/lib/llvm-4.0/lib/clang/4.0.0/lib/linux/libclang_rt.asan-x86_64.so
/usr/lib/llvm-4.0/lib/clang/4.0.0/lib/linux/libclang_rt.asan-i386.so

After this step, I setup the LD_LIBRARY_PATH as follows:

root@522051d201d2:/home# echo $LD_LIBRARY_PATH
/usr/lib:/usr/lib/llvm-4.0/lib/:/usr/lib/x86_64-linux-gnu/

And lastly, I have exported it using the command export LD_LIBRARY_PATH. Now, if I try to run the cppgrep tool, I am still getting the same error. The command to test the tool after building the docker is as follows: (1) cd into the cppgrep directory, like code/cppgrep, (2) enter the docker container and mount the folder under /home: $ docker run -it -v $PWD:/home clang (3) run cppgrep using ./cppgrep 'x' test.cpp command. It is suppossed to return functions and variables that has name x.

To replicate the error, after downloading and unzipping the file from github repository, build the docker container using $ docker build -t clang . command. Then follow 1,2,3 steps in the above paragraph.

The Voyager
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1 Answers1

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After couple of days struggle, solved it!!

My initial assumption about the reason for the error is correct. The clang-llvm environment was not available to the cppgrep tool, but I made the mistake in the way of providing the environment information to the cppgrep tool.

The answer has two steps: (1) change the Makefile to point the correct location where you have installed the llvm, in my case, I change the following line in Makefile from HEADERS := -isystem /llvm/include/ to HEADERS := -isystem /usr/lib/llvm-4.0/include/. (2) You have to compile the file again by using the make command, just enter an empty space and save the cppgrep.cpp file before giving the command, otherwise, you will get a message as make: Nothing to be done for 'all'..

That is it, now you should be able to run the cppgrep tool by running ./cppgrep 'x' test.cpp or ./cppgrep -help. For using the other tools in this docker such as ast-dump, mccabe, etc. you have to follow the same above two steps before using them.

The Voyager
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