如何修改C++ Makefile以支持OpenMPI并行编译多文件生成单可执行文件

本人对Makefile经验不足，若问题简单还请见谅！现有一个Makefile可将多个.cpp和.h文件编译为.o文件并生成可执行文件，当前使用g++编译器。希望修改该文件以支持OpenMPI多核计算，环境为Windows 11 x64架构（使用Cygwin构建运行代码），同时需兼容MacOS系统。注：并行化宏仅存在于项目主文件mag_spec_tracker.cpp中。

当前Makefile #

IDIR = include
CXX = g++ 
CXXFLAGS = -I$(IDIR) -std=c++17
ODIR = obj
_DEPS = my_functions.h particle.h beam.h threevector.h threematrix.h screen.h magnet.h
DEPS = $(patsubst %,$(IDIR)/%,$(_DEPS))
_OBJ = my_functions.o particle.o beam.o mag_spec_tracker.o screen.o magnet.o 
OBJ = $(patsubst %,$(ODIR)/%,$(_OBJ))

$(ODIR)/%.o: %.cpp $(DEPS)
    $(CXX) -c -o $@ $< $(CXXFLAGS)

run: $(OBJ)
    $(CXX) -o $@ $^ $(CXXFLAGS)

.PHONY: clean

clean:
    rm -f $(ODIR)/*.o *~ core $(IDIR)/*~ 

尝试添加的MPI编译标志代码 #

MPI_COMPILE_FLAGS = $(shell mpicc --showme:compile)
MPI_LINK_FLAGS = $(shell mpicc --showme:link)

更新（2022/12/6） #

根据Matzeri的建议（OpenMPI的C编译器应为mpicxx而非g），将Makefile中的g++替换为mpicxx后出现链接错误：

$ make
mpicxx -c -o obj/mag_spec_tracker.o mag_spec_tracker.cpp -Iinclude -std=c++17
mpicxx -o run obj/my_functions.o obj/particle.o obj/beam.o obj/mag_spec_tracker.o obj/screen.o obj/magnet.o -Iinclude -std=c++17
C:/Users/Jason/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/12.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot find -lmpi_cxx: No such file or directory
C:/Users/Jason/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/12.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot find -lmpi: No such file or directory
C:/Users/Jason/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/12.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot find -lopen-rte: No such file or directory
C:/Users/Jason/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/12.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot find -lopen-pal: No such file or directory
collect2.exe: error: ld returned 1 exit status
make: *** [Makefile:19: run] Error 1

移除mingw64目录后，又出现编译器路径错误：

$ make
mpicxx -o run obj/my_functions.o obj/particle.o obj/beam.o obj/mag_spec_tracker.o obj/screen.o obj/magnet.o -Iinclude -std=c++17
--------------------------------------------------------------------------
The Open MPI wrapper compiler was unable to find the specified compiler
g++ in your PATH.

Note that this compiler was either specified at configure time or in
one of several possible environment variables.
--------------------------------------------------------------------------
make: *** [Makefile:19: run] Error 1

已将c:\cygwin\bin添加到环境变量，且确认mpicxx存在于该目录，但问题仍存在，求解决办法！

内容的提问来源于stack exchange，提问作者jsncrdrll