[CMake] [CMAKE] cmake_device_link.o: nvcc fatal: Unknown option 'Wl, -start-group'

[Marc CHEVRIER]

Hi,

To avoid this, put link flags in ‘LINK_FLAGS’ target properly.
´target_link_libraries’ is populating ´LINK_LIBRARIES’ target property.

Le sam. 8 sept. 2018 à 01:40, Alvin Chu <chujingjun at gmail.com> a écrit :

> Hi cmake team,
> I'm using cmake 3.12.1, and building a project which has cuda codes, the
> cmake file looks like,
> list(APPEND ALL_OBJECTS  $<TARGET_OBJECTS: normal_obj>)
> list(APPEND ALL_OBJECTS  $<TARGET_OBJECTS: cuda_obj>)
> add_library(lib1 SHARED ${ALL_OBJECTS})
> list(APPEND ALL_LIBRARIES -Wl,-start-group)
> list(APPEND ALL_LIBRARIES  ${SOME_LIBS})
> list(APPEND ALL_LIBRARIES -Wl,-end-group)
> target_link_libraries(lib1 ${ALL_LIBRARIES})
>
> Now for this project, cmake will generate a cmake_device_link.o, using
> the link flags in lib1, then I got error
> nvcc   fatal   : Unknown option 'Wl,-start-group'
>
> I checked cmake source code, and seems cmake doesn't check if the link
> flags in lib1 is supported by nvcc or not, and it directly passed all the
> flag to nvcc which caused the problem. Maybe this is one way to fix this
> issue.
>
> I also noticed cmMakefileLibraryTargetGenerator::WriteStaticLibraryRules
> will check CUDA_RESOLVE_DEVICE_SYMBOLS to decide if need generate
> cmake_device_link.o or not,
> but cmMakefileLibraryTargetGenerator::WriteSharedLibraryRules don't, I
> tried add this check in cmMakefileLibraryTargetGenerator::WriteSharedLibraryRules,
> and my build can success w/o cmake_device_link.o, so maybe this is also a
> way to fix the issue.
>
> I'm new to cmake, so if there's any better way to solve my problem, please
> let me know.
>
> Thanks.
> Alvin
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