mpi的一个bug（mpi与c++的冲突）

Some users may get error messages such as

		SEEK_SET is #defined but must not be for the C++ binding of MPI	

The problem is that both stdio.h and the MPI C++ interface use SEEK_SET, SEEK_CUR, and SEEK_END. This is really a bug in the MPI-2 standard. You can try adding

		#undef SEEK_SET
		#undef SEEK_END
		#undef SEEK_CUR
	

before mpi.h is included, or add the definition

		-DMPICH_IGNORE_CXX_SEEK
	

to the command line (this will cause the MPI versions of SEEK_SET etc. to be skipped).

最简单的方法是在Makefile里的这一行加上：

CXXFLAGS = -DMPICH_IGNORE_CXX_SEEK

编译就可以通过了