caf script fails to link against shared-library client code

[rouson]

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Defect/Bug Report

Building json-fortran fails to link unless the OpenCoarrays caf script is modified to link against libcaf_mpi.so instead of libcaf_mpi.a.

• OpenCoarrays Version: 2.4.0-8-g7aafb20
• Fortran Compiler: gfortran 9.0.1
• C compiler used for building lib:gcc 9.0.1
• Installation method: install.sh
• Output of uname -a: Linux Sourcery-Institute-VM 4.15.0-45-generic #48-Ubuntu SMP Tue Jan 29 16:28:13 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
• MPI library being used: MPICH 3.2
• Machine architecture and number of physical cores: macBook Pro with 4-core 2.7 GHz Intel core i7
• Version of CMake: 3.12.3

Observed Behavior

[  8%] Linking Fortran shared library lib/libjsonfortran.so
/usr/bin/ld: /home/rouson/Desktop/Builds/opt/opencoarrays/2.3.1-7aafb2/gnu/9.0.1/lib/libcaf_mpi.a(mpi_caf.c.o): relocation R_X86_64_32 against `.rodata.str1.8' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: final link failed: Nonrepresentable section on output
collect2: error: ld returned 1 exit status
Error: comand:
   `/home/rouson/Builds/opt/gnu/9.0.1/bin/gfortran -I/home/rouson/Desktop/Builds/opt/opencoarrays/2.3.1-7aafb2/gnu/9.0.1/include/OpenCoarrays-2.4.0-8-g7aafb20_GNU-9.0.1 -fcoarray=lib -Wl,-rpath -Wl,/home/rouson/Builds/opt/mpich/3.2/gnu/9.0.0/lib -Wl,--enable-new-dtags -L/home/rouson/Desktop/Builds/opt/mpich/3.2/gnu/9.0.0/lib -fPIC -fbacktrace -fno-omit-frame-pointer -O3 -DNDEBUG -O3 -shared -Wl,-soname,libjsonfortran.so.6.10 -o lib/libjsonfortran.so.6.10.0 CMakeFiles/jsonfortran.dir/src/json_kinds.F90.o CMakeFiles/jsonfortran.dir/src/json_parameters.F90.o CMakeFiles/jsonfortran.dir/src/json_string_utilities.F90.o CMakeFiles/jsonfortran.dir/src/json_value_module.F90.o CMakeFiles/jsonfortran.dir/src/json_file_module.F90.o CMakeFiles/jsonfortran.dir/src/json_module.F90.o /home/rouson/Desktop/Builds/opt/opencoarrays/2.3.1-7aafb2/gnu/9.0.1/lib/libcaf_mpi.a /home/rouson/Builds/opt/mpich/3.2/gnu/9.0.0/lib/libmpifort.so /home/rouson/Builds/opt/mpich/3.2/gnu/9.0.0/lib/libmpi.so`
failed to compile.
CMakeFiles/jsonfortran.dir/build.make:158: recipe for target 'lib/libjsonfortran.so.6.10.0' failed
make[6]: *** [lib/libjsonfortran.so.6.10.0] Error 1
CMakeFiles/Makefile2:523: recipe for target 'CMakeFiles/jsonfortran.dir/all' failed
make[5]: *** [CMakeFiles/jsonfortran.dir/all] Error 2
CMakeFiles/Makefile2:705: recipe for target 'CMakeFiles/build_tests.dir/rule' failed
make[4]: *** [CMakeFiles/build_tests.dir/rule] Error 2
Makefile:396: recipe for target 'build_tests' failed
make[3]: *** [build_tests] Error 2
CMakeFiles/json-fortran.dir/build.make:112: recipe for target 'TPLs/Stamp/json-fortran/json-fortran-build' failed
make[2]: *** [TPLs/Stamp/json-fortran/json-fortran-build] Error 2
CMakeFiles/Makefile2:147: recipe for target 'CMakeFiles/json-fortran.dir/all' failed
make[1]: *** [CMakeFiles/json-fortran.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2

Expected Behavior

Successful build of json-fortran.

Workaround

1. Replace libcaf_mpi.a with libcaf_mpi.soin the installedcaf` script.
2. Append the installed OpenCoarrays lib directory to the LD_LIBRARY_PATH.

[zbeekman]

Fixed in #639 and release 2.5.0