[Error in Building User Application ] unrecognized command-line option ‘-fopenmp=libiomp5’

I am trying to use OpenFHE to build my own user application by following the documentation: Building User Applications.

About OpenFHE installation

I have installed Openfhe for Ubuntu by referring to Installation . It is installed in my system at /usr/local/lib

The headers files are at : /usr/local/include

I am getting the following error while make

[ 50%] Building CXX object CMakeFiles/fhe-demo.dir/simple-integers.cpp.o
c++: error: unrecognized command-line option ‘-fopenmp=libiomp5’
make[2]: *** [CMakeFiles/fhe-demo.dir/build.make:76: CMakeFiles/fhe-demo.dir/simple-integers.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:83: CMakeFiles/fhe-demo.dir/all] Error 2
make: *** [Makefile:91: all] Error 2

The application directory consists of the following CMakelists.txt is copied and renamed from CMakelists.User.txt from the root directory of this git repo. It consists of the following lines:

cmake_minimum_required (VERSION 3.5.1)

### To use gcc/g++ on a Macintosh, you must set the Compilers
### here, not inside the project
##if(APPLE)
##       set(CMAKE_C_COMPILER "/usr/local/bin/gcc-7")
##       set(CMAKE_CXX_COMPILER "/usr/local/bin/g++-7")
##endif()
### TODO: for now, we use CLang for Mac
###
### In order to create OpenFHE's static libraries you should enable
### the BUILD_STATIC option. For that, you run "cmake .. -DBUILD_STATIC=ON".
### After having your link completed you will find static libs
### with the suffix "_static" in ./build/libs/.
### Examples: OPENFHEpke_static.a, OPENFHEcore_static.a, etc.
### After you run "make install" in your build directory, you can build your custom application.
### If you need your application to be linked statically, then run "cmake .. -DBUILD_STATIC=ON"

project(demo CXX)
set(CMAKE_CXX_STANDARD 17)
option( BUILD_STATIC "Set to ON to include static versions of the library" OFF)

find_package(OpenFHE CONFIG REQUIRED)
if (OpenFHE_FOUND)
    message(STATUS "FOUND PACKAGE OpenFHE")
    message(STATUS "OpenFHE Version: ${BASE_OPENFHE_VERSION}")
    message(STATUS "OpenFHE installed as shared libraries: ${OpenFHE_SHARED}")
    message(STATUS "OpenFHE include files location: ${OpenFHE_INCLUDE}")
    message(STATUS "OpenFHE lib files location: ${OpenFHE_LIBDIR}")
    message(STATUS "OpenFHE Native Backend size: ${OpenFHE_NATIVE_SIZE}")
else()
    message(FATAL_ERROR "PACKAGE OpenFHE NOT FOUND")
endif ()

set( CMAKE_CXX_FLAGS ${OpenFHE_CXX_FLAGS} )

include_directories( ${OPENMP_INCLUDES} )
include_directories( ${OpenFHE_INCLUDE} )
include_directories( ${OpenFHE_INCLUDE}/third-party/include )
include_directories( ${OpenFHE_INCLUDE}/core )
include_directories( ${OpenFHE_INCLUDE}/pke )
include_directories( ${OpenFHE_INCLUDE}/binfhe )
### add directories for other OpenFHE modules as needed for your project

link_directories( ${OpenFHE_LIBDIR} )
link_directories( ${OPENMP_LIBRARIES} )
if(BUILD_STATIC)
    set( CMAKE_EXE_LINKER_FLAGS "${OpenFHE_EXE_LINKER_FLAGS} -static")
    link_libraries( ${OpenFHE_STATIC_LIBRARIES} )
else()
    set( CMAKE_EXE_LINKER_FLAGS ${OpenFHE_EXE_LINKER_FLAGS} )
    link_libraries( ${OpenFHE_SHARED_LIBRARIES} )
endif()

### ADD YOUR EXECUTABLE(s) HERE
### add_executable( EXECUTABLE-NAME SOURCES )
###
### EXAMPLE:
### add_executable( test demo-simple-example.cpp )
add_executable( fhe-demo simple-integers.cpp)

simple-integers.cpp is taken from here

The output of cmake .. with above CMakelists.txt is:

G++ version : g++ -v

Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/11/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 11.4.0-1ubuntu1~22.04' --with-bugurl=file:///usr/share/doc/gcc-11/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,m2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-11 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=release --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --disable-werror --enable-cet --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none=/build/gcc-11-XeT9lY/gcc-11-11.4.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-11-XeT9lY/gcc-11-11.4.0/debian/tmp-gcn/usr --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu --with-build-config=bootstrap-lto-lean --enable-link-serialization=2
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 11.4.0 (Ubuntu 11.4.0-1ubuntu1~22.04)

cmake version
```
cmake --version
cmake version 3.22.1
```

CMake suite maintained and supported by Kitware (kitware.com/cmake).



P.S : I referred https://forum.freecad.org/viewtopic.php?t=65301 for a solution but it didn't seem to work for me.

I am a begineer in C++ . I would be grateful for any pointers in solving this!

openfheorg / openfhe-development

[Error in Building User Application ] unrecognized command-line option ‘-fopenmp=libiomp5’ #821

About OpenFHE installation