Minimize size of intermediate dist artifacts

Makefile

@@ -75,15 +75,16 @@ dist-macos: ## Build an LLVM release distribution for x86_64-apple-darwin
 		--with-assertions \
 		--build-dir=$(CWD)/build/release \
 		--install-dir=$(CWD)/build/x86_64-apple-darwin \
-		--dist-dir=$(CWD)/build/packages/dist
+		--dist-dir=$(CWD)/build/packages/dist \
+		--clean-obj
 
 dist-linux: ## Build an LLVM release distribution for x86_64-unknown-linux
 	@mkdir -p build/packages/ && \
 	cd lumen/ && \
 	docker build \
 		-t llvm-project:dist \
 		--target=dist \
-		--build-arg buildscript_args="-release=$(RELEASE)" . && \
+		--build-arg buildscript_args="-release=$(RELEASE) -clean-obj" . && \
 		utils/dist/extract-release.sh -release $(RELEASE)
 
 docker: ## Build a Docker image containing an LLVM distribution

lumen/Dockerfile

@@ -52,14 +52,16 @@ RUN mkdir /tmp/cmake-install && \
     tar -xzf cmake-${CMAKE_VERSION}-Linux-x86_64.tar.gz -C /usr/local --strip-components=1 && \
     cd / && rm -rf /tmp/cmake-install
 
+FROM builder AS stage1
+ARG buildscript_args
+
 # Checkout the source code.
 RUN mkdir -p /tmp/sources && \
     git clone --depth=1 --single-branch --branch lumen https://github.com/lumen/llvm-project /tmp/sources
 
 ADD utils/dist /tmp/scripts
 
 # Run the stage1 build. This bootstraps the clang compiler.
-ARG buildscript_args
 RUN mkdir -p /tmp/build && \
     mkdir -p /tmp/install && \
     mkdir -p /tmp/dist && \
@@ -87,7 +89,7 @@ RUN /tmp/scripts/build-dist.sh \
 
 # Distribution image. Produces a scratch image with the release package
 FROM scratch AS dist
-COPY --from=builder /tmp/dist /opt/dist
+COPY --from=stage1 /tmp/dist /opt/dist
 
 # Stage 2. Produce a minimal release image with build results.
 FROM launcher.gcr.io/google/debian9:latest AS release
@@ -100,5 +102,5 @@ RUN apt-get update && \
         binutils && \
     rm -rf /var/lib/apt/lists/*
 # Copy build results of stage 1 to /usr/local.
-COPY --from=builder /tmp/install/ /usr/local/
+COPY --from=stage1 /tmp/install/ /usr/local/
 ENTRYPOINT ["bash"]

lumen/utils/dist/build-dist.sh

@@ -27,6 +27,7 @@ enable_link_dylib="OFF"
 enable_static_libcpp=""
 enable_build_shared="OFF"
 skip_build=""
+clean_obj=""
 skip_install=""
 skip_dist=""
 enable_ccache="OFF"
@@ -103,6 +104,7 @@ function usage() {
     echo " -skip-build             Skip building and go straight to install"
     echo " -skip-install           Do not perform install step at end of build"
     echo " -skip-dist              Do build a distribution package"
+    echo " -clean-obj              Remove obj directory after build is complete"
     echo " -with-docs              Build documentation"
     echo " -no-docs                Do not build documentation"
     echo " -with-examples          Build examples"
@@ -205,6 +207,9 @@ while [ $# -gt 0 ]; do
         -skip-dist | --skip-dist)
             skip_dist="true"
             ;;
+        -clean-obj | --clean-obj)
+            clean_obj="true"
+            ;;
         -with-docs | --with-docs)
             enable_docs="ON"
             ;;
@@ -637,7 +642,11 @@ else
             configure_core 1 $flavor "$stage1_objdir"
             build_core 1 $flavor "$stage1_objdir" "$stage1_destdir"
             clean_RPATH "${stage1_destdir}/usr/local"
-            ;;
+
+            if [ "${clean_obj}" = "true" ]; then
+                rm -rf "${stage1_objdir}"
+            fi
+        ;;
         2)
             if [ -z "$skip_build" ]; then
                 echo "# Stage 2: Preparing Build Enviornment"
@@ -664,6 +673,10 @@ else
                 configure_core 2 $flavor "$stage2_objdir"
                 build_core 2 $flavor "$stage2_objdir" "$stage2_destdir"
                 clean_RPATH "${stage2_destdir}/usr/local"
+
+                if [ "${clean_obj}" = "true" ]; then
+                    rm -rf "${stage2_objdir}"
+                fi
             else
                 if [ ! -d "$stage2_destdir" ]; then
                     echo "# Unable to skip build! Previous stage 2 build doesn't exist"