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build: check for the bad combo of Cuda >= 13.2 but LLVM < 22.1.2 #2133

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build: check for the bad combo of Cuda >= 13.2 but LLVM < 22.1.2 #2133

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10 changes: 10 additions & 0 deletions src/cmake/externalpackages.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -132,6 +132,16 @@ if (OSL_USE_OPTIX)
message (FATAL_ERROR "NVPTX target is not available in the provided LLVM build")
endif()

# CUDA 13.2+ requires LLVM 22.1.2+ for the _NV_RSQRT_SPECIFIER fix.
# See: https://github.com/AcademySoftwareFoundation/OpenShadingLanguage/issues/2129
if (CUDA_VERSION VERSION_GREATER_EQUAL "13.2" AND LLVM_VERSION VERSION_LESS "22.1.2")
message (FATAL_ERROR
"${ColorRed}CUDA ${CUDA_VERSION} requires LLVM 22.1.2 or newer "
"(you have LLVM ${LLVM_VERSION}). CUDA 13.2+ needs the "
"_NV_RSQRT_SPECIFIER fix from llvm-project commit c1c833734cf0, "
"first shipped in LLVM 22.1.2. Either upgrade LLVM or downgrade CUDA.${ColorReset}")
endif ()

set (CUDA_LIB_FLAGS "--cuda-path=${CUDA_TOOLKIT_ROOT_DIR}")

# If the user wants, try to use static libs here to putting static lib
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