ERROR: Unknown build system

[pBlasiak]

I am trying to use ycm-generator for OpenFOAM.
I compiled ycm according to this
https://github.com/Valloric/YouCompleteMe#full-installation-guide

I typed the following
in the .vim/bundle/YCM-Generator directory I typed
./config_gen.py -v -e -c ~/ycm_temp/llvm_root_dir/bin/clang ~/OpenFOAM/OpenFOAM-v1612+/

but I got the error:
ERROR: Unknown build system

I have read issues https://github.com/rdnetto/YCM-Generator/issues/36 and
https://github.com/rdnetto/YCM-Generator/issues/61
but it did not help

[pBlasiak]

I once again compiled YCM but now with install.py script
and now I typed
./config_gen.py -c /usr/bin/clang-6.0 ~/OpenFOAM/OpenFOAM-v1612+/

but I still have
ERROR: Unknown build system

which compiler should I point?
From YCM compilation I got:
`
Searching Python 2.7 libraries...
Found Python library: /usr/lib/python2.7/config-x86_64-linux-gnu/libpython2.7.so
Found Python headers folder: /usr/include/python2.7
-- The C compiler identification is GNU 5.4.0
-- The CXX compiler identification is GNU 5.4.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found PythonLibs: /usr/lib/python2.7/config-x86_64-linux-gnu/libpython2.7.so (found suitable version "2.7.12", minimum required is "2.7")
-- Using libclang archive: /home/przemek/.vim/bundle/YouCompleteMe/third_party/ycmd/cpp/../clang_archives/libclang-6.0.0-x86_64-linux-gnu-ubuntu-14.04.tar.bz2
-- Using libclang to provide semantic completion for C/C++/ObjC
-- Using external libclang: /tmp/ycm_build_XRx8QT/lib/libclang.so.6.0
-- NOT using clang-tidy for static analysis.
-- Configuring done
-- Generating done
-- Build files have been written to: /tmp/ycm_build_XRx8QT
Scanning dependencies of target BoostParts
[ 1%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/filesystem/src/path.cpp.o
[ 3%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/filesystem/src/utf8_codecvt_facet.cpp.o
[ 5%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/filesystem/src/operations.cpp.o
[ 7%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/filesystem/src/path_traits.cpp.o
[ 11%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/filesystem/src/portability.cpp.o
[ 11%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/filesystem/src/codecvt_error_category.cpp.o
[ 13%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/filesystem/src/windows_file_codecvt.cpp.o
[ 15%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/filesystem/src/unique_path.cpp.o
[ 17%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/usinstances.cpp.o
[ 19%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/wide_posix_api.cpp.o
[ 21%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/regex_traits_defaults.cpp.o
[ 23%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/wc_regex_traits.cpp.o
[ 25%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/regex_debug.cpp.o
[ 26%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/winstances.cpp.o
[ 28%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/cregex.cpp.o
[ 30%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/regex.cpp.o
[ 32%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/regex_raw_buffer.cpp.o
[ 34%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/instances.cpp.o
[ 36%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/posix_api.cpp.o
[ 38%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/w32_regex_traits.cpp.o
[ 40%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/static_mutex.cpp.o
[ 42%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/icu.cpp.o
[ 44%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/fileiter.cpp.o
[ 46%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/c_regex_traits.cpp.o
[ 48%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/cpp_regex_traits.cpp.o
[ 50%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/system/src/error_code.cpp.o
[ 51%] Linking CXX static library libBoostParts.a
[ 51%] Built target BoostParts
Scanning dependencies of target ycm_core
[ 53%] Building CXX object ycm/CMakeFiles/ycm_core.dir/IdentifierCompleter.cpp.o
[ 55%] Building CXX object ycm/CMakeFiles/ycm_core.dir/CodePointRepository.cpp.o
[ 57%] Building CXX object ycm/CMakeFiles/ycm_core.dir/CodePoint.cpp.o
[ 59%] Building CXX object ycm/CMakeFiles/ycm_core.dir/IdentifierUtils.cpp.o
[ 63%] Building CXX object ycm/CMakeFiles/ycm_core.dir/Result.cpp.o
[ 63%] Building CXX object ycm/CMakeFiles/ycm_core.dir/Character.cpp.o
[ 65%] Building CXX object ycm/CMakeFiles/ycm_core.dir/ycm_core.cpp.o
[ 67%] Building CXX object ycm/CMakeFiles/ycm_core.dir/CharacterRepository.cpp.o
[ 69%] Building CXX object ycm/CMakeFiles/ycm_core.dir/Candidate.cpp.o
[ 71%] Building CXX object ycm/CMakeFiles/ycm_core.dir/CandidateRepository.cpp.o
[ 73%] Building CXX object ycm/CMakeFiles/ycm_core.dir/Utils.cpp.o
[ 75%] Building CXX object ycm/CMakeFiles/ycm_core.dir/Word.cpp.o
[ 76%] Building CXX object ycm/CMakeFiles/ycm_core.dir/versioning.cpp.o
[ 78%] Building CXX object ycm/CMakeFiles/ycm_core.dir/ClangCompleter/ClangUtils.cpp.o
[ 80%] Building CXX object ycm/CMakeFiles/ycm_core.dir/ClangCompleter/CompilationDatabase.cpp.o
[ 82%] Building CXX object ycm/CMakeFiles/ycm_core.dir/ClangCompleter/TranslationUnitStore.cpp.o
[ 84%] Building CXX object ycm/CMakeFiles/ycm_core.dir/ClangCompleter/ClangCompleter.cpp.o
[ 86%] Building CXX object ycm/CMakeFiles/ycm_core.dir/ClangCompleter/ClangHelpers.cpp.o
[ 88%] Building CXX object ycm/CMakeFiles/ycm_core.dir/ClangCompleter/Range.cpp.o
[ 90%] Building CXX object ycm/CMakeFiles/ycm_core.dir/ClangCompleter/Documentation.cpp.o
[ 92%] Building CXX object ycm/CMakeFiles/ycm_core.dir/ClangCompleter/CompletionData.cpp.o
[ 94%] Building CXX object ycm/CMakeFiles/ycm_core.dir/ClangCompleter/TranslationUnit.cpp.o
[ 96%] Building CXX object ycm/CMakeFiles/ycm_core.dir/IdentifierDatabase.cpp.o
[ 98%] Building CXX object ycm/CMakeFiles/ycm_core.dir/PythonSupport.cpp.o
[100%] Linking CXX shared library /home/przemek/.vim/bundle/YouCompleteMe/third_party/ycmd/ycm_core.so
[100%] Built target ycm_core
-- The C compiler identification is GNU 5.4.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Found PythonLibs: /usr/lib/python2.7/config-x86_64-linux-gnu/libpython2.7.so (found version "2.7.12")
-- Configuring done
-- Generating done
-- Build files have been written to: /tmp/regex_build_GCz0Sk
Scanning dependencies of target _regex
[ 66%] Building C object CMakeFiles/_regex.dir/regex_2/_regex.c.o
[ 66%] Building C object CMakeFiles/_regex.dir/regex_2/_regex_unicode.c.o
[100%] Linking C shared library /home/przemek/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/cregex/regex_2/_regex.so
[100%] Built target _regex

`

[JoshuaSBrown]

So I ran into this problem to, when trying to run it with a c++ repository but it turns out it was because I was not in the same directory as the CMakeLists.txt file. At least I think that is what the problem was. And I had not built the project prior to running :YcmGenerateConfig.

[pBlasiak]

Thank you for advice
It really helped
I ran now this
./config_gen.py --verbose ~/OpenFOAM/przemek-v1612+/applications/solvers/multiphase/interFoam
but I got this error:

Found OpenFOAM Make/options

Running wmake...
$ wmake
wmake error: environment variable $WM_OPTIONS not set
Build completed in 0.01 sec

Collected 0 relevant entries for C compilation (0 discarded).
Collected 0 relevant entries for C++ compilation (0 discarded).

ERROR: No commands were logged to the build logs (C: /tmp/tmpxLKLKL, C++: /tmp/tmpA1G4_a).
Your build system may not be compatible.

but then I ran this with -e flag
./config_gen.py -e ~/OpenFOAM/przemek-v1612+/applications/solvers/multiphase/interFoam

and it works now :)

Found OpenFOAM Make/options

Running wmake...
$ wmake
Build completed in 0.62 sec

Collected 0 relevant entries for C compilation (0 discarded).
Collected 2 relevant entries for C++ compilation (0 discarded).
Created YCM config file with 28 C++ flags

Press ENTER or type command to continue

ps
for OpenFOAM useres it is important to firstly load OF environments
e.g. like this
https://www.cfd-online.com/Forums/blogs/wyldckat/931-advanced-tips-working-openfoam-shell-environment.html

[pBlasiak]

additionally it is important to delete linux* old compilations from Make directory
than in main directory of a solver one can apply in vim :YcmGenerateConfig -e
for me it works