Bug fix for Samples

Summary

In the DirectProgramming/C++/StructuredGrids/iso3dfd_omp_offload/src/CMakeLists.txt, the default cmake instructions shown in the official guidance cmake -DVERIFY_RESULTS=0 .. cannot really successfully make-build the project successfully and report the below messages, indicating that the compiler is not set properly.

~/Documents/oneAPI-samples/DirectProgramming/C++/StructuredGrids/iso3dfd_omp_offload/src/build$ make -j
[ 25%] Building CXX object CMakeFiles/iso3dfd.dir/utils.o
[ 50%] Building CXX object CMakeFiles/iso3dfd.dir/iso3dfd.o
[ 75%] Building CXX object CMakeFiles/iso3dfd.dir/iso3dfd_verify.o
c++: error: unrecognized command-line option ‘-fiopenmp’; did you mean ‘-fopenmp’?
c++: error: unrecognized command-line option ‘-fiopenmp’; did you mean ‘-fopenmp’?
c++: error: unrecognized command-line option ‘-fiopenmp’; did you mean ‘-fopenmp’?
c++: error: unrecognized command-line option ‘-fopenmp-targets=spir64’
make[2]: *** [CMakeFiles/iso3dfd.dir/build.make:90: CMakeFiles/iso3dfd.dir/utils.o] Error 1
make[2]: *** Waiting for unfinished jobs....
c++: error: unrecognized command-line option ‘-fopenmp-targets=spir64’
c++: error: unrecognized command-line option ‘-fopenmp-targets=spir64’
make[2]: *** [CMakeFiles/iso3dfd.dir/build.make:76: CMakeFiles/iso3dfd.dir/iso3dfd.o] Error 1
make[2]: *** [CMakeFiles/iso3dfd.dir/build.make:104: CMakeFiles/iso3dfd.dir/iso3dfd_verify.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:84: CMakeFiles/iso3dfd.dir/all] Error 2
make: *** [Makefile:91: all] Error 2

In the CMakeLists file, the 3rd line should be changed from set(CMAKE_CXX_COMPILER "icpx") to set(CMAKE_CXX_COMPILER icpx). Or we should explicitly declare the compiler options.

Version

c9c1625

Open DirectProgramming/C++/StructuredGrids/iso3dfd_omp_offload/src/CMakeLists.txt and inspect the compiler setting on line 3. Start by reproducing the documented cmake -DVERIFY_RESULTS=0 .. configuration and make -j command. Done means the sample configures and builds without the reported compiler-option errors.