basic fix for compare-commits.sh

scripts/compare-commits.sh

@@ -16,15 +16,21 @@ bench_args="${@:3}"
 rm -f llama-bench.sqlite > /dev/null
 
 # to test a backend, call the script with the corresponding environment variable (e.g. GGML_CUDA=1 ./scripts/compare-commits.sh ...)
+if [ -n "$GGML_CUDA" ]; then
+    cmake_opts="-DGGML_CUDA=ON"
+fi
+
+function run {
+    rm -fr build > /dev/null
+    cmake -B build -S . $cmake_opts > /dev/null
+    cmake --build build -t llama-bench > /dev/null
+    build/bin/llama-bench -o sql -oe md $bench_args | sqlite3 llama-bench.sqlite
+}
 
 git checkout $1 > /dev/null
-make clean > /dev/null
-make -j$(nproc) $make_opts llama-bench > /dev/null
-./llama-bench -o sql -oe md $bench_args | sqlite3 llama-bench.sqlite
+run
 
 git checkout $2 > /dev/null
-make clean > /dev/null
-make -j$(nproc) $make_opts llama-bench > /dev/null
-./llama-bench -o sql -oe md $bench_args | sqlite3 llama-bench.sqlite
+run
 
 ./scripts/compare-llama-bench.py -b $1 -c $2