cmake: build libs separate

foreach(SIMPLE_LIB REAX MEAM POEMS USER-ATC USER-AWPMD USER-COLVARS USER-H5MD

  USER-MOLFILE USER-QMMM)

  if(ENABLE_${SIMPLE_LIB})

    string(REGEX REPLACE "^USER-" "" SIMPLE_LIB "${SIMPLE_LIB}")

    string(TOLOWER "${SIMPLE_LIB}" INC_DIR)

    file(GLOB_RECURSE ${SIMPLE_LIB}_SOURCES ${LAMMPS_LIB_SOURCE_DIR}/${INC_DIR}/*.F

      ${LAMMPS_LIB_SOURCE_DIR}/${INC_DIR}/*.c ${LAMMPS_LIB_SOURCE_DIR}/${INC_DIR}/*.cpp)

    list(APPEND LIB_SOURCES ${${SIMPLE_LIB}_SOURCES})

    include_directories(${LAMMPS_LIB_SOURCE_DIR}/${INC_DIR})

    string(REGEX REPLACE "^USER-" "" PKG_LIB "${SIMPLE_LIB}")

    string(TOLOWER "${PKG_LIB}" PKG_LIB)

    file(GLOB_RECURSE ${PKG_LIB}_SOURCES ${LAMMPS_LIB_SOURCE_DIR}/${PKG_LIB}/*.F

      ${LAMMPS_LIB_SOURCE_DIR}/${PKG_LIB}/*.c ${LAMMPS_LIB_SOURCE_DIR}/${PKG_LIB}/*.cpp)

    option(BUILD_SHARED_PKG_LIBS "Build package libs shared" OFF)

    if(BUILD_SHARED_PKG_LIBS)

      add_library(${PKG_LIB} SHARED ${${PKG_LIB}_SOURCES})

      set_target_properties(${PKG_LIB} PROPERTIES SOVERSION ${SOVERSION})

      if(INSTALL_LIB)

        install(TARGETS ${PKG_LIB} LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR} ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})

      else()

        message(FATAL_ERROR "Shared library has to be installed, use -DINSTALL_LIB=ON to install lammps with a library")

      endif()

    else()

      add_library(${PKG_LIB} STATIC ${${PKG_LIB}_SOURCES})

    endif()

    list(APPEND LAMMPS_LINK_LIBS ${PKG_LIB})

    foreach(PKG_SRC ${${SIMPLE_LIB}_SOURCES})

      set_property(SOURCE ${PKG_SRC} APPEND PROPERTY COMPILE_FLAGS -I${LAMMPS_LIB_SOURCE_DIR}/${PKG_LIB})

    endforeach()

  endif()

endforeach()