LinuxQuestions.org - Advantages of using mpicc versus gcc with explicit linkage

This thread is composed of 2 questions:

Question number 1:

This is a makefile I just wrote:

Code:

IMPI = /opt/intel/impi/3.2.0.011/include64/



ABLAS = $(HOME)/libraries/BLAS/libblas.a

ALAPACK = $(HOME)/libraries/lapack-3.4.1/liblapack.a

ASCALAPACK = $(HOME)/libraries/scalapack-2.0.2/libscalapack.a



LMPI = -L/opt/intel/impi/3.2.0.011/lib64 -lmpi -lmpigf -lmpigi



HOSTF = mpd.hosts



default: blogs



# Linking stage:

blogs: blogs.o

        gfortran -g -o blogs blogs.o $(ASCALAPACK) $(ALAPACK) $(ABLAS) \

        $(LMPI) -lrt -lpthread -ldl



# Compiling stage:

blogs.o: blogs.c

        gcc -I$(IMPI) -c -DAdd_ -g -Wall -Werror blogs.c



# Utilities:

clean:

        rm -f *.o blogs

        clear



run:

        mpirun -r ssh -f $(HOSTF) -np $(np) `pwd`/blogs



debug:

        mpirun -r ssh -f $(HOSTF) -l -np 1 xterm -sb -wf -e gdb -x blogs.gdbc\

        `pwd`/blogs

What is wrong with it?!? It won't rebuild after I modify my source code.

Question number 2: General culture!

Is there any advantage/disadvantage in compiling MPI code, as in the previous Makefile, that is, using the gcc compilers with all of the linkage information, rather than using mpicc?

I know that:

Code:

[ejspeiro@node01 scalapack-ex07]$ mpicc -show

gcc -I/opt/intel/impi/3.2.0.011/include64 -L/opt/intel/impi/3.2.0.011/lib64 -Xlinker --enable-new-dtags -Xlinker -rpath -Xlinker $libdir -Xlinker -rpath -Xlinker /opt/intel/mpi-rt/3.2 -lmpi -lmpigf -lmpigi -lrt -lpthread -ldl

So I have parsed that and eliminated everything that I THOUGHT was redundant? Was I 0k?

This is the kind of question , which I expect helps people (and myself) to learn more! :)

Thanks! :)