Compiling Fortran Subroutines as R Shared Objects on Mac OS-X
Chad R. Bhatti wrote:
Hello, I am trying to compile some F77 subroutines as shared objects for R on my Mac. --> Mac OS-X Version 10.4.11 (Tiger Intel Mac) <SNIP> chad-r-bhattis-computer:~/MyR/Examples/Fortran/Test1 chadrbhatti$ R CMD SHLIB two.f gfortran -arch i386 -fPIC -g -O2 -c two.f -o two.o gcc -arch i386 -std=gnu99 -dynamiclib -Wl,-headerpad_max_install_names -mmacosx-version-min=10.4 -undefined dynamic_lookup -single_module -multiply_defined suppress -L/usr/local/lib -o two.so two.o -lgfortran -F/Library/Frameworks/R.framework/.. -framework R -Wl,-framework -Wl,CoreFoundation /usr/bin/libtool: for architecture cputype (16777223) cpusubtype (3) object: /usr/local/lib/libgfortran.dylib malformed object (unknown load command 4) /usr/bin/libtool: for architecture cputype (16777223) cpusubtype (3) object: /usr/local/lib/libgcc_s.10.4.dylib malformed object (unknown load command 4) make: *** [two.so] Error 1 chad-r-bhattis-computer:~/MyR/Examples/Fortran/Test1 chadrbhatti$ which g77 /usr/local/bin/g77 chad-r-bhattis-computer:~/MyR/Examples/Fortran/Test1 chadrbhatti$ which gfortran/usr/local/bin/gfortran
Hi Chad, I have an Intel mac running OS X 10.5 and I have compiled and used several Fortran 77 and Fortran 90 subroutines, including MINPACK and MINOS, using R CMD SHLIB. I guess the first question I have, is have you installed the developer tools from the OSX cd (the installer is located in the 'Optional Installs' folder)? Pardon if this seems obvious, but it may explain the complaint about the libgcc shared library. Second, sometimes the options used in gfortran commands executed by R CMD SHLIB can cause problems (specifically the -fPIC or -fno-common flags), especially if modules or common blocks are involved in the fortran routines. To get around this you can try running the compiler on the Fortran code yourself and then R CMD SHLIB on the object code like so: gfortran -c *.f R CMD SHLIB -o myLib.so *.o I'm no UNIX wizard myself, but the way you're trying to do things seems like the correct way and should work, I have absolutely no idea why it is complaining about cpu architecture if you have an Intel based machine. -Charlie ----- Charlie Sharpsteen Undergraduate Environmental Resources Engineering Humboldt State University
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