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POmake with g++/intel C++ compiler calling fortran functions
 

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  1. POmake with g++/intel C++ compiler calling fortran functions
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    <p>I have been trying to call some functions from a library provided by a commercial finite element code. The examples on using this library are being compiled with intel fortran compiler for my type of system so I am using intel c++ compiler to link the object files, I have set up a simple test case with the extern declerations as </p> <pre><code>extern "C" { int binini_( int* ); int biniqr8_( int*, int* ); int binset_( int*, int*, int*, int*, int*, int*, const char*, int*, int*, int* ); int binrd8_( int*, int*, int*, int*, int*, int* ); int binclo_( int*, const char*, int* ); } </code></pre> <p>And now, I am trying to use intel c++ compiler with the below makefile:</p> <pre><code>CXX = icpc -parallel IncludeDir = /home/utabak/external_libraries/boost_1_46_1 LinkingDir0 = /home/utabak/external_libraries/boost_1_46_1/stage/lib LinkingDir1 = /opt/ansys-12.1/v121/ansys/customize/misc/linx64 LibLink1 = bin LibLink2 = boost_filesystem LibLink3 = boost_system all: test1 test1: test_binlib1.o ${CXX} -o $@ $? -L${LinkingDir0} \ -L${LinkingDir1} \ -l${LibLink1} -l${LibLink2} -l${LibLink3} test_binlib1.o: test_binlib1.cc ${CXX} -I${IncludeDir} -c $? </code></pre> <p>which links and compiles fine. And run as expected. I wanted to do the same with the g++ also, after some trial and error, I set up a make file that is compiling and linking fine: </p> <pre><code>CXX = g++ -g -pg -Wall -pthread IncludeDir = /home/utabak/external_libraries/boost_1_46_1 LinkingDir0 = /home/utabak/external_libraries/boost_1_46_1/stage/lib LinkingDir1 = /opt/ansys-12.1/v121/ansys/customize/misc/linx64 LinkingDir2 = /home/utabak/intel/composerxe-2011/lib/intel64 LibLink1 = bin LibLink2 = boost_filesystem LibLink3 = boost_system LibLink4 = iomp5 # an extra library from intel compiler # openmp, for intel C++ -parallel does it # for g++ I have to explicitly link this all: test1 test1: test_binlib1.o ${CXX} ${LFLAGS} -o $@ $? -L${LinkingDir0} \ -L${LinkingDir1} -L${LinkingDir2} \ -l${LibLink1} -l${LibLink2} -l${LibLink3} -l${LibLink4} test_binlib1.o: test_binlib1.cc ${CXX} -I${IncludeDir} -c $? </code></pre> <p>Hoever, this executable does not run correctly, and strangely, it some times gives a segmentation fault, or file open error, where I first try to open a file using the above mentioned fortran library function, binset_ .</p> <p>I am puzzling on the reason of these errors and the differences. What could be the answer to this problem?</p>
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    1. COMixing object code generated by different compiler (families) can be tricky. I have my doubts about linking-in the iomp5 library from the intel compiler. If you are you using openmp, you should probably use the openmp library from gcc. By using the flag `-fopenmp` it is automatically linked in; it also implies `-pthread`, so that can be left off.
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    2. COto be honest, I searched through the documentation of both compilers and still doing, but if I use g++ I should also use '-lg2c' link flag however on our local cluster this shared object is not available and I am guessing that this IO library for c++/fortran integration can be the source of the problem for g++, I will build the libraries on my laptop and see what comes out, thx
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