contrib: Add script to build llvm locally

contrib/linux_build_llvm.sh emulates what the CI script does to
build llvm.

Signed-off-by: Keith Packard <[email protected]>

Author: keith-packard

contrib/linux_build_llvm.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+
+# Script to mimic how CI is building llvm toolchain.
+
+# Default is to use current directory as the working directory.
+# SDK is under ${WORKING_ROOT_DIR}/sdk-ng/
+# Build directory is ${WORKING_ROOT_DIR}/build-workspace/
+WORKING_ROOT_DIR="${PWD}"
+SDK_DIR="${WORKING_ROOT_DIR}/sdk-ng"
+BUILD_DIR="${WORKING_ROOT_DIR}/build-workspace"
+
+pushd "${BUILD_DIR}"
+mkdir -p llvm-build
+mkdir -p llvm
+
+#TEST=echo
+cd llvm-build
+$TEST cmake \
+    -GNinja \
+    --install-prefix="${BUILD_DIR}"/llvm \
+    -DLLVM_ENABLE_ZSTD=OFF \
+    ${LLVM_CMAKE_ARGS} \
+    "${SDK_DIR}"/scripts/llvm || exit 1
+
+# Build LLVM toolchain
+$TEST ninja llvm-toolchain || exit 1
+
+# Run LLVM tests
+$TEST ninja check-llvm-toolchain || exit 1
+
+# Install LLVM toolchain
+$TEST ninja install-llvm-toolchain || exit 1
+popd