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enable_language(C)
set(CMAKE_C_LINK_GROUP_USING_cross_refs_SUPPORTED TRUE)
if(CMAKE_C_COMPILER_ID STREQUAL "GNU"
AND CMAKE_SYSTEM_NAME STREQUAL "Linux")
set(CMAKE_C_LINK_GROUP_USING_cross_refs "LINKER:--start-group"
"LINKER:--end-group")
elseif(CMAKE_C_COMPILER_ID STREQUAL "SunPro"
AND CMAKE_SYSTEM_NAME STREQUAL "SunOS")
set(CMAKE_C_LINK_GROUP_USING_cross_refs "LINKER:-z,rescan-start"
"LINKER:-z,rescan-end")
else()
# feature not yet supported for the other environments
set(CMAKE_C_LINK_GROUP_USING_cross_refs_SUPPORTED FALSE)
endif()
add_library(func1 STATIC func1.c func3.c)
add_library(func2 STATIC func2.c)
add_executable(main main.c)
target_link_libraries(main PRIVATE "$<LINK_GROUP:cross_refs,func1,func2>")
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