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UPSTREAM PR #18361: ggml-cuda: fix blackwell native builds #700

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UPSTREAM PR #18361: ggml-cuda: fix blackwell native builds #700

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818ba58
ggml-cuda: fix blackwell native builds
Dec 25, 2025
907b840
replace for GGML_NATIVE=OFF too
Dec 25, 2025
b9a692e
only replace for native
Dec 25, 2025
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21 changes: 21 additions & 0 deletions ggml/src/ggml-cuda/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,27 @@ if (CUDAToolkit_FOUND)

enable_language(CUDA)

# Replace any 12x-real architectures with 12x{a}-real. FP4 ptx instructions are not available in just 12x
if (GGML_NATIVE)
set(PROCESSED_ARCHITECTURES "")
foreach(ARCH ${CMAKE_CUDA_ARCHITECTURES_NATIVE})
if(ARCH MATCHES "^12[0-9]$")
string(REGEX REPLACE "^(12[0-9]).*$" "\\1" BASE_ARCH ${ARCH})
message(STATUS "Replacing ${ARCH} with ${BASE_ARCH}a-real")
list(APPEND PROCESSED_ARCHITECTURES "${BASE_ARCH}a-real")
else()
list(APPEND PROCESSED_ARCHITECTURES ${ARCH})
endif()
endforeach()
set(CMAKE_CUDA_ARCHITECTURES ${PROCESSED_ARCHITECTURES})
else()
foreach(ARCH ${CMAKE_CUDA_ARCHITECTURES})
if(ARCH MATCHES "^12[0-9]$")
message(FATAL_ERROR "Compute capability ${ARCH} used, use ${ARCH}a or ${ARCH}f for Blackwell specific optimizations")
endif()
endforeach()
endif()

file(GLOB GGML_HEADERS_CUDA "*.cuh")
list(APPEND GGML_HEADERS_CUDA "../../include/ggml-cuda.h")

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