fix

Author: matthewdouglas

.github/scripts/build-cuda.sh

@@ -6,14 +6,14 @@ declare cuda_targets
 
 set -xeuo pipefail
 
-if [ -n "${cuda_targets}" ]; then
+if [[ -v cuda_targets ]; then
+    build_capability="${cuda_targets}"
+else
     # By default, target Maxwell through Hopper.
     build_capability="50;52;60;61;70;75;80;86;89;90"
 
     # CUDA 12.8: Add sm100 and sm120; remove < sm75 to align with PyTorch 2.7+cu128 minimum
     [[ "${cuda_version}" == 12.8.* ]] && build_capability="75;80;86;89;90;100;120"
-else
-    build_capability="${cuda_targets}"
 fi
 
 [[ "${build_os}" = windows-* ]] && python3 -m pip install ninja