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build: use --offload-jobs for parallel offload compilation #367

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build: use --offload-jobs for parallel offload compilation #367

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19 changes: 14 additions & 5 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -479,12 +479,21 @@ target_compile_definitions(TransferBench PRIVATE
TB_GIT_COMMIT="${TB_GIT_COMMIT}"
)

check_cxx_compiler_flag(-parallel-jobs=12 HAVE_PARALLEL_JOBS)
if(HAVE_PARALLEL_JOBS)
message(STATUS "Enabling parallel compile jobs: -parallel-jobs=12")
target_compile_options(TransferBench PRIVATE -parallel-jobs=12)
# LLVM 21 renamed the downstream -parallel-jobs= option to --offload-jobs=.
check_cxx_compiler_flag("--offload-jobs=12" HAVE_OFFLOAD_JOBS)
if(HAVE_OFFLOAD_JOBS)
set(TB_OFFLOAD_JOBS_FLAG "--offload-jobs=12")
else()
message(STATUS "Compiler does not support -parallel-jobs=12 (or the check failed); skipping -parallel-jobs optimisation")
check_cxx_compiler_flag("-parallel-jobs=12" HAVE_PARALLEL_JOBS)
if(HAVE_PARALLEL_JOBS)
set(TB_OFFLOAD_JOBS_FLAG "-parallel-jobs=12")
endif()
endif()
if(TB_OFFLOAD_JOBS_FLAG)
message(STATUS "Enabling parallel compile jobs: ${TB_OFFLOAD_JOBS_FLAG}")
target_compile_options(TransferBench PRIVATE ${TB_OFFLOAD_JOBS_FLAG})
else()
message(STATUS "Compiler does not support parallel offload jobs; skipping the optimisation")
endif()

target_link_options(TransferBench PRIVATE -fgpu-rdc)
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