#    Copyright 2019 Wolfgang Thaller.##    This file is part of Retro68.##    Retro68 is free software: you can redistribute it and/or modify#    it under the terms of the GNU General Public License as published by#    the Free Software Foundation, either version 3 of the License, or#    (at your option) any later version.##    Retro68 is distributed in the hope that it will be useful,#    but WITHOUT ANY WARRANTY; without even the implied warranty of#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the#    GNU General Public License for more details.##    You should have received a copy of the GNU General Public License#    along with Retro68.  If not, see <http://www.gnu.org/licenses/>.  # This example does nothing useful, but it does it using a shared library.# Doesn't run on 68K. # Step 1: Tell CMake to compile the library.# (CMake writes the output to an XCOFF file named libLibrary.so)add_library(Library SHARED library.c library.h) if(TARGET retrocrt)    # Hack: if we are building as part of the Retro68 source tree,    #       make sure the run-time library is already compiled    # (not needed for standalone projects)    add_dependencies(Library retrocrt)endif(TARGET retrocrt) # Step 2: Tell the linker to export symbols. # Either export everything:# target_link_options(Library PUBLIC -Wl,-bexpfull) # Or tell it to use an export list from a separate file:# (CMake 3.13 or later)# target_link_options(Library PUBLIC -Wl,-bE:${CMAKE_CURRENT_SOURCE_DIR}/library.exp)set_target_properties(Library PROPERTIES LINK_FLAGS -Wl,-bE:${CMAKE_CURRENT_SOURCE_DIR}/library.exp) # Note: Step 1 & 2 are equivalent to the command:#  powerpc-apple-macos-gcc -shared -Wl,-bE:library.exp library.c -o libLibrary.so # Step 3: Convert the library to PEF format: add_custom_command(    OUTPUT Library.pef    COMMAND ${MAKE_PEF} "libLibrary.so" -o "Library.pef"    DEPENDS Library) # Step 4: Combine the PEF data fork with a resource fork containing a cfrg resource: if (REZ_INCLUDE_PATH)    set(REZ_INCLUDE_FLAG -I${REZ_INCLUDE_PATH})endif() add_custom_command(    OUTPUT Library.bin Library Library.dsk Library.ad "%Library.ad"    COMMAND ${REZ}             ${REZ_FLAGS}            ${CMAKE_CURRENT_SOURCE_DIR}/library.r            ${REZ_INCLUDE_FLAG}            -o "Library.bin" --cc "Library.dsk" --cc "Library"            --cc "%Library.ad"            -t "shlb" -c "????"            --data Library.pef                DEPENDS Library.pef ${rsrc_files}) # Step 5: Create a CMake custom target so CMake knows that Steps 3 and 4 need to be doneadd_custom_target(Library_APPL ALL DEPENDS Library.bin) # Step 6: Create the main application# (the add_applicatin macro works similarly to the commands above, but for applications.) add_application(Application application.c) # Step 7: Link the application to the library target (the XCOFF version of the library!)target_link_libraries(Application Library)