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enable_language(C)
if(NOT CMAKE_SHARED_LIBRARY_RPATH_ORIGIN_TOKEN)
if(CMAKE_C_PLATFORM_ID STREQUAL "Linux")
# Sanity check for platform that is definitely known to support $ORIGIN.
message(FATAL_ERROR "Platform fails to report relative RPATH support")
else()
message(STATUS "Platform does not support relative RPATHs, skipping")
endif()
return()
endif()
set(CMAKE_BUILD_RPATH_USE_ORIGIN ON)
function(CheckRpath target rpath)
add_custom_command(
TARGET ${target}
POST_BUILD
COMMAND ${CMAKE_COMMAND} -Dfile=$<TARGET_FILE:${target}> -Drpath=${rpath}
-P "${CMAKE_CURRENT_SOURCE_DIR}/RelativeCheck.cmake"
VERBATIM
)
endfunction()
if(CMAKE_C_COMPILER_ID STREQUAL "XL" AND CMAKE_BINARY_DIR MATCHES " ")
# XL 16.1.0.0 fails building the library if the output path contains a space.
set(externDir)
message(STATUS "Skipping external library test because of a toolchain bug")
else()
get_filename_component(externDir "${CMAKE_BINARY_DIR}" DIRECTORY)
set(externDir "${externDir}/Relative-extern")
endif()
add_library(utils SHARED A.c)
add_library(utils-sub SHARED A.c)
set_property(TARGET utils-sub PROPERTY LIBRARY_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/libs)
if(externDir)
add_library(utils-extern SHARED A.c)
set_property(TARGET utils-extern PROPERTY LIBRARY_OUTPUT_DIRECTORY ${externDir})
endif()
add_executable(main main.c)
target_link_libraries(main utils)
CheckRpath(main "\$ORIGIN")
add_executable(main-norel main.c)
target_link_libraries(main-norel utils)
set_property(TARGET main-norel PROPERTY BUILD_RPATH_USE_ORIGIN OFF)
CheckRpath(main-norel "${CMAKE_CURRENT_BINARY_DIR}")
add_executable(mainsub main.c)
target_link_libraries(mainsub utils)
set_property(TARGET mainsub PROPERTY RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/bin)
CheckRpath(mainsub "\$ORIGIN/../")
add_executable(main-sub main.c)
target_link_libraries(main-sub utils-sub)
CheckRpath(main-sub "\$ORIGIN/libs")
add_executable(mainsub-sub main.c)
target_link_libraries(mainsub-sub utils-sub)
set_property(TARGET mainsub-sub PROPERTY RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/bin)
CheckRpath(mainsub-sub "\$ORIGIN/../libs")
if(externDir)
# Binaries linking to libraries outside the build tree should have an absolute RPATH.
add_executable(main-extern main.c)
target_link_libraries(main-extern utils-extern)
CheckRpath(main-extern "${externDir}")
endif()
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