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Bugfix - Add SM80/90 architecture to CUTLASS builds for CUDA 12.8+ for A100 #785

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Bugfix - Add SM80/90 architecture to CUTLASS builds for CUDA 12.8+ for A100 #785

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e0bb811
Add SM80 architecture to CUTLASS builds for CUDA 12.8+ and 12.9+
Mar 11, 2026
d56fb5c
Add arch support for MSCCL.
Mar 17, 2026
b8cfc30
Apply suggestion from @Copilot
polarG Mar 17, 2026
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8 changes: 4 additions & 4 deletions third_party/Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -39,14 +39,14 @@ sb_micro_path:
mkdir -p $(SB_MICRO_PATH)/lib

# Build cutlass.
# for cuda 12.9 and later Build from commit v3.9 (3.9 release commit) for blackwell support
# For CUDA 12.9 and later, build from CUTLASS v4.1.0 (required for Blackwell support).
cuda_cutlass:
ifeq ($(shell echo $(CUDA_VER)">=12.9" | bc -l), 1)
$(eval ARCHS := "100;103")
$(eval ARCHS := "80;90;100;103")
if [ -d cutlass ]; then rm -rf cutlass; fi
git clone --branch v4.1.0 --depth 1 https://github.com/NVIDIA/cutlass.git && cd cutlass
else ifeq ($(shell echo $(CUDA_VER)">=12.8" | bc -l), 1)
$(eval ARCHS := "90;100")
$(eval ARCHS := "80;90;100")
if [ -d cutlass ]; then rm -rf cutlass; fi
git clone --branch v3.9.2 --depth 1 https://github.com/NVIDIA/cutlass.git && cd cutlass
Comment on lines 46 to 51
else ifeq ($(shell echo $(CUDA_VER)">=11.8" | bc -l), 1)
Expand Down Expand Up @@ -270,7 +270,7 @@ apex_rocm:
# Build MSCCL for CUDA
cuda_msccl: sb_micro_path
ifeq ($(shell echo $(CUDA_VER)">=12.9" | bc -l), 1)
$(eval ARCHS := 100 103)
$(eval ARCHS := 80 90 100 103)
if [ -d msccl ]; then rm -rf msccl; fi; \
git clone --single-branch --branch main https://github.com/Azure/msccl.git \
&& git -C msccl checkout 87048bd && git -C msccl submodule update --recursive --init
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