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We represent stub libraries, e.g., for CUDA, using imported `SHARED` library targets with only `IMPORTED_IMPLIB`, and no `IMPORTED_LOCATION`, to indicate that the stub file is meant only for linkers and not dynamic loaders. See commit7351d590ee(cmTarget: Add a way to represent imported shared library stubs, 2023-07-17, v3.28.0-rc1~344^2) and commitfc6508921c(cmComputeLinkInformation: Restore soname lookup for non-imported targets, 2023-12-05, v3.28.0~4^2). If a shared library is linked to a stub, it has a `NEEDED` field populated with the `SONAME` found in the stub. When a dependent target links to such a shared library, some linkers want to find a library file on disk and load it to see what symbols it provides. This is necessary for linkers that enforce `--no-allow-shlib-undefined`. On hosts with only the stub library installed, e.g., with only the CUDA toolkit development package, the real runtime library corresponding to the stub's `SONAME` may not even exist, so no `-rpath-link` flag can help linkers find it. Pass the stub library to linkers explicitly so they can find it without searching.
26 lines
807 B
CMake
26 lines
807 B
CMake
enable_language(C)
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add_library(Stub SHARED Stub.c)
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set_target_properties(Stub PROPERTIES
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SOVERSION 1
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LIBRARY_OUTPUT_DIRECTORY lib
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)
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set(StubDir ${CMAKE_CURRENT_BINARY_DIR}/lib/stubs)
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set(Stub "${StubDir}/${CMAKE_SHARED_LIBRARY_PREFIX}Stub${CMAKE_SHARED_LIBRARY_SUFFIX}")
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add_custom_target(StubCopy
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COMMAND ${CMAKE_COMMAND} -E make_directory "${StubDir}"
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COMMAND ${CMAKE_COMMAND} -E copy "$<TARGET_SONAME_FILE:Stub>" "${Stub}"
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BYPRODUCTS ${Stub}
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)
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add_dependencies(StubCopy Stub)
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add_library(Imp::Stub SHARED IMPORTED)
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set_property(TARGET Imp::Stub PROPERTY IMPORTED_IMPLIB "${Stub}")
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add_dependencies(Imp::Stub StubCopy)
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add_library(StubUse SHARED StubUse.c)
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target_link_libraries(StubUse PRIVATE Imp::Stub)
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add_executable(StubExe StubExe.c)
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target_link_libraries(StubExe PRIVATE StubUse)
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