CMake configuration fails on OSx

[dpiparo]

Hi,

I tried to configure BLonD on a mac and stumbled on these errors

-- The CXX compiler identification is AppleClang 7.3.0.7030031
-- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++
-- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Performing Test COMPILER_HAS_CXX11
-- Performing Test COMPILER_HAS_CXX11 - Success
-- Try OpenMP CXX flag = [-fopenmp=libomp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [ ]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [-fopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [/openmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [-Qopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [-openmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [-xopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [+Oopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [-qsmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [-mp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
CMake Error at /usr/local/Cellar/cmake/3.5.2/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:148 (message):
  Could NOT find OpenMP (missing: OpenMP_CXX_FLAGS)
Call Stack (most recent call first):
  /usr/local/Cellar/cmake/3.5.2/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:388 (_FPHSA_FAILURE_MESSAGE)
  /usr/local/Cellar/cmake/3.5.2/share/cmake/Modules/FindOpenMP.cmake:234 (find_package_handle_standard_args)
  CMakeLists.txt:125 (find_package)


-- Configuring incomplete, errors occurred!
See also "/Users/danilopiparo/blondTest/build/CMakeFiles/CMakeOutput.log".
See also "/Users/danilopiparo/blondTest/build/CMakeFiles/CMakeError.log".

I wonder if this is something easy to fix in order to be able to reach mac users (or people who happen to have a mac at disposal).

[dpiparo]

Also related to openmp, the file include/blond/math_functions.h implicitly assumes the presence of the package.

[OlegJakushkin]

Ok, I'll look into mac build instructions. OpenMP is everywhere in current blond C++ implementation so it is required package.