Thread: How to rebuild a library?

Hi again!


I would like to build upon one of my previous threads (Link), where the original problem has changed to a new one.

I'm referring to the following lines of code:

Code:

mpi_kmeans_mex.$(SUFFIX):    libmpikmeans mpi_kmeans_mex.o 
    $(CC) mpi_kmeans_mex.o -shared -o mpi_kmeans_mex.$(SUFFIX) libmpikmeans.a $(MATLAB_LIB) 

mpi_assign_mex.$(SUFFIX):    libmpikmeans mpi_assign_mex.o
    $(CC) mpi_assign_mex.o -shared -o mpi_assign_mex.$(SUFFIX) libmpikmeans.a $(MATLAB_LIB)

My code is unable to run, since the existing library libmpikmeans.a and object file mpi_assign_mex.o (Linux) are not compatible with my system (Mac). Thus, they must be rebuilt-

I've found a similar thread here, but I'm not sure how and where to implement this.
Additionally, how do I rebuild .o files?


Any suggestions?

Originally Posted by dmh2000

you need to get the source for the library and rebuild on your machine. for that library i googled 'mpikmeans' and found this link for the project mloss | Project details:MPIKmeans. there is a link title 'Archive: download here' that lets you download the source. then you have to use your Mac tools to build it according to instructions in the README and Makefile files.

Hey dmh2000!

Thanks for your effort!
I have the file already. The code excerpt I've posted above was from the makefile itself!
Let me post another part of the Makefile. This is where the library (.a) and object files (.o) are created (I think!)

Code:

#
# Choose your compiler
#

CC = gcc
CPP = g++
CFLAGS=-O3 -ffast-math -fomit-frame-pointer -fPIC -Werror 

#
# MPI KMEANS FLAGS
#
VERBOSEFLAG=-DKMEANS_VERBOSE=0 # 0: silent, 1:iteration counter, 2:everything
PRECISION=-DINPUT_TYPE=0 # 0: double, 1:float 


matlab: mpi_kmeans_mex.$(SUFFIX) mpi_assign_mex.$(SUFFIX)

standalone:    mpi_kmeans_main mpi_assign_main
python:    cython_wrapper

mpi_kmeans.o:    mpi_kmeans.cxx mpi_kmeans.h
    $(CC) $(CFLAGS) $(VERBOSEFLAG) $(PRECISION) -c -o $@ mpi_kmeans.cxx

libmpikmeans:    mpi_kmeans.o
    ar rc libmpikmeans.a mpi_kmeans.o
    ranlib libmpikmeans.a
    $(CPP) -shared -fPIC $(CFLAGS) $(VERBOSEFLAG) -o libmpikmeans.so $(VERBOSEFLAGS) $(PRECISION) mpi_kmeans.cxx

mpi_kmeans_main.o:    mpi_kmeans_main.cxx
    $(CC) $(CFLAGS) $(VERBOSEFLAG) $(BOOST_INCLUDE) -c -o mpi_kmeans_main.o mpi_kmeans_main.cxx 

mpi_assign_main.o:    mpi_assign_main.cxx
    $(CC) $(CFLAGS) $(VERBOSEFLAG) $(BOOST_INCLUDE) -c -o mpi_assign_main.o mpi_assign_main.cxx 

mpi_kmeans_main:    libmpikmeans mpi_kmeans_main.o
    $(CC) mpi_kmeans_main.o  $(CFLAGS) $(VERBOSEFLAG) -L/usr/lib/ -static -o mpi_kmeans -lm libmpikmeans.a \
        $(BOOST_LIB) $(LIBS)

mpi_assign_main:    libmpikmeans mpi_assign_main.o
    $(CC) mpi_assign_main.o $(CFLAGS) $(VERBOSEFLAG) -L/usr/lib/ -static -o mpi_assign -lm libmpikmeans.a \
        $(BOOST_LIB) $(LIBS)

%_mex.o:    %_mex.cxx
    $(CC) $(CFLAGS) $(VERBOSEFLAG) $(MATLAB_INCLUDE) $(PRECISION) -c $^ -o $@

#
# These are the two main files we need !!
#
mpi_kmeans_mex.$(SUFFIX):    libmpikmeans mpi_kmeans_mex.o 
    $(CC) mpi_kmeans_mex.o -shared -o mpi_kmeans_mex.$(SUFFIX) libmpikmeans.a $(MATLAB_LIB) 

mpi_assign_mex.$(SUFFIX):    libmpikmeans mpi_assign_mex.o
    $(CC) mpi_assign_mex.o -shared -o mpi_assign_mex.$(SUFFIX) libmpikmeans.a $(MATLAB_LIB)
#
# end
#

In the readme file, it says: run make matlab. I've highlighted the parts I BELIEVE are carried out, once I use the command.
Now which line am I supposed to modify - and how?

Originally Posted by root4

Yes, those object files are indeed compiled properly, but according to your logs, the linker cannot resolve external symbols for the final step.
I guess it's because the "mex" library (due to -lmex on the command line) is probably missing;
so I'm just asking if you do have that file (libmex.so) in the directory you specified (../maci64).

Aha - I see what you mean now.
You're right - the file libmex.so does NOT exist in the path /Applications/MATLAB_R2011a.app/bin/maci64
However, there is a file called libmex.dylib instead - isn't that good enough?