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[release/3.4][Build] Compile FlashAttention on arm64 platforms #79496

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[release/3.4][Build] Compile FlashAttention on arm64 platforms #79496

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afed30c
[Build] Compile FlashAttention on arm64 platforms (#79488)
liuhao2638 Jul 17, 2026
d62b6cb
[Build] Avoid FlashAttention v3 for sm100 builds (#79500)
liuhao2638 Jul 17, 2026
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3 changes: 3 additions & 0 deletions cmake/external/flashattn.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -171,6 +171,9 @@ else()
set(CACHE_TAR_DIR "${FA_BUILD_DIR}/flashattn_libs_${FLASHATTN_TAG}")

set(SKIP_BUILD_FA OFF)
if(WITH_ARM)
set(WITH_FA_BUILD_WITH_CACHE OFF)
endif()
if(WITH_FA_BUILD_WITH_CACHE)

message(STATUS "Downloading ${TAR_FILE_URL} to ${CACHE_TAR_PATH}")
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4 changes: 1 addition & 3 deletions cmake/third_party.cmake
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Expand Up @@ -349,7 +349,6 @@ include(external/glog) # download, build, install glog

########################### include third_party according to flags ###############################
if(WITH_GPU
AND NOT WITH_ARM
AND NOT WIN32
AND NOT APPLE)
if(${CMAKE_CUDA_COMPILER_VERSION} GREATER_EQUAL 11.0)
Expand Down Expand Up @@ -601,13 +600,12 @@ if(WITH_ROCM)
endif()

if(WITH_GPU
AND NOT WITH_ARM
AND NOT WIN32
AND NOT APPLE)
if(${CMAKE_CUDA_COMPILER_VERSION} GREATER_EQUAL 12.3
AND ${CMAKE_CUDA_COMPILER_VERSION} LESS_EQUAL 13.0)
foreach(arch ${NVCC_ARCH_BIN})
if(${arch} GREATER_EQUAL 90)
if(${arch} EQUAL 90)
set(WITH_FLASHATTN_V3 ON)
break()
endif()
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