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cmake_minimum_required(VERSION 3.25.1)

project(example VERSION 0.0.1)

include(GenerateExportHeader)

set(CMAKE_POSITION_INDEPENDENT_CODE  ON)
set(CMAKE_EXPORT_COMPILE_COMMANDS    ON)
set(CMAKE_C_VISIBILITY_PRESET        hidden)
set(CMAKE_VISIBILITY_INLINES_HIDDEN  1)

add_library(lib1 lib0.h lib0.c)
generate_export_header(lib1 BASE_NAME LIB0)
target_include_directories(lib1 PUBLIC ${CMAKE_CURRENT_BINARY_DIR})

target_compile_definitions(lib1
    PRIVATE PROJ_IMPL_STR="."
)

add_library(lib2 lib0.h lib0.c)
target_include_directories(lib2 PUBLIC ${CMAKE_CURRENT_BINARY_DIR})
target_compile_definitions(lib2
    PRIVATE lib1_EXPORTS=1 # hack, use same exports of lib1
    PRIVATE PROJ_IMPL_STR="!"
)

add_library(liba OBJECT liba.h liba.c)
target_include_directories(liba PUBLIC ${CMAKE_CURRENT_BINARY_DIR})
generate_export_header(liba)
target_compile_definitions(liba
    PRIVATE liba_EXPORTS=1 # should not be necessary...
)

add_library(liba1 liba.h $<TARGET_OBJECTS:liba>)
target_link_libraries(liba1 PRIVATE lib1)

add_library(liba2 $<TARGET_OBJECTS:liba>)
target_link_libraries(liba2 PRIVATE lib2)

add_library(libb OBJECT libb.h libb.c)
target_include_directories(libb PUBLIC ${CMAKE_CURRENT_BINARY_DIR})
generate_export_header(libb)
target_compile_definitions(libb
    PRIVATE libb_EXPORTS=1 # should not be necessary...
)

add_library(libb1 $<TARGET_OBJECTS:libb>)
target_link_libraries(libb1 PRIVATE lib1)

add_library(libb2 $<TARGET_OBJECTS:libb>)
target_link_libraries(libb2 PRIVATE lib2)

add_library(libc libc.h libc.c)
generate_export_header(libc)
target_include_directories(libc PUBLIC ${CMAKE_CURRENT_BINARY_DIR})

add_executable(main1 main1.c)
target_link_libraries(main1 liba1 libb1 libc)
add_executable(main2 main2.c)
target_link_libraries(main2 liba2 libb2 libc)