tests/docker: use prebuilt toolchain for debian-hexagon-cross

The current docker image for cross compiling hexagon guests
is manually built since it takes >2 hours to build from source.

This patch:
 1. Solves the above issue by using the prebuilt clang
    toolchain hosted on CodeLinaro [1] and maintained by QUIC [2].
 2. The dockerfile is also switched from multi-stage to single stage
    build to allow the CI docker engine to reuse the layer cache.
 3. Re-enables the hexagon-cross-container job to be always run in
    CI and makes it a non-optional dependency for the
    build-user-hexagon job.

The changes for 1 & 2 together bring down the build time to
~3 minutes in GitLab CI when cache is reused and ~9 minutes
when cache cannot be reused.

[1]: https://github.com/CodeLinaro/hexagon-builder
[2]: https://github.com/quic/toolchain_for_hexagon/releases/

Signed-off-by: Mukilan Thiyagarajan <quic_mthiyaga@quicinc.com>
[AJB: also tweak MAINTAINERS]
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20221219144354.11659-1-quic_mthiyaga@quicinc.com>
Message-Id: <20221221090411.1995037-6-alex.bennee@linaro.org>

.gitlab-ci.d/buildtest.yml

@@ -275,14 +275,10 @@ build-user-static:
     CONFIGURE_ARGS: --disable-tools --disable-system --static
     MAKE_CHECK_ARGS: check-tcg
 
-# Because the hexagon cross-compiler takes so long to build we don't rely
-# on the CI system to build it and hence this job has an optional dependency
-# declared. The image is manually uploaded.
 build-user-hexagon:
   extends: .native_build_job_template
   needs:
     job: hexagon-cross-container
-    optional: true
   variables:
     IMAGE: debian-hexagon-cross
     TARGETS: hexagon-linux-user

.gitlab-ci.d/container-cross.yml

@@ -37,28 +37,11 @@ armhf-debian-cross-container:
 # We never want to build hexagon in the CI system and by default we
 # always want to refer to the master registry where it lives.
 hexagon-cross-container:
-  extends: .base_job_template
-  image: docker:stable
+  extends: .container_job_template
   stage: containers
   variables:
     NAME: debian-hexagon-cross
-    GIT_DEPTH: 1
     QEMU_JOB_ONLY_FORKS: 1
-  services:
-    - docker:dind
-  before_script:
-    - export TAG="$CI_REGISTRY_IMAGE/qemu/$NAME:latest"
-    - export COMMON_TAG="$CI_REGISTRY/qemu-project/qemu/qemu/$NAME:latest"
-    - docker info
-    - docker login $CI_REGISTRY -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD"
-  script:
-    - echo "TAG:$TAG"
-    - echo "COMMON_TAG:$COMMON_TAG"
-    - docker pull $COMMON_TAG
-    - docker tag $COMMON_TAG $TAG
-    - docker push "$TAG"
-  after_script:
-    - docker logout
 
 hppa-debian-cross-container:
   extends: .container_job_template

MAINTAINERS

@@ -204,7 +204,6 @@ F: tests/tcg/hexagon/
 F: disas/hexagon.c
 F: configs/targets/hexagon-linux-user/default.mak
 F: docker/dockerfiles/debian-hexagon-cross.docker
-F: docker/dockerfiles/debian-hexagon-cross.docker.d/build-toolchain.sh
 
 Hexagon idef-parser
 M: Alessandro Di Federico <ale@rev.ng>

tests/docker/Makefile.include

@@ -109,10 +109,6 @@ debian-toolchain-run = \
 			"PREPARE", $1))
 debian-toolchain = $(call debian-toolchain-run,$(patsubst docker-image-%,%,$1))
 
-docker-image-debian-hexagon-cross: $(DOCKER_FILES_DIR)/debian-hexagon-cross.docker \
-	$(DOCKER_FILES_DIR)/debian-hexagon-cross.d/build-toolchain.sh
-	$(call debian-toolchain, $@)
-
 docker-image-debian-microblaze-cross: $(DOCKER_FILES_DIR)/debian-toolchain.docker \
     $(DOCKER_FILES_DIR)/debian-microblaze-cross.d/build-toolchain.sh
 	$(call debian-toolchain, $@)

tests/docker/dockerfiles/debian-hexagon-cross.docker

@@ -7,44 +7,29 @@
 #
 FROM docker.io/library/debian:11-slim
 
-# Install common build utilities
-RUN apt update && \
+# Duplicate deb line as deb-src
+RUN cat /etc/apt/sources.list | sed "s/^deb\ /deb-src /" >> /etc/apt/sources.list
+RUN apt-get update && \
     DEBIAN_FRONTEND=noninteractive apt install -yy eatmydata && \
     DEBIAN_FRONTEND=noninteractive eatmydata \
-    apt install -y --no-install-recommends \
-        bison \
+# Install common build utilities
+    apt-get install -y --no-install-recommends \
+        curl \
+        xz-utils \
         ca-certificates \
-        clang \
-        cmake \
+        bison \
         flex \
-        gcc \
-        lld \
-        make \
-        ninja-build \
-        python3 \
-        rsync \
-        wget \
-        xz-utils
-
-ENV TOOLCHAIN_INSTALL /usr/local
-ENV ROOTFS /usr/local
-
-ENV LLVM_URL https://github.com/llvm/llvm-project/archive/bfcd21876adc3498065e4da92799f613e730d475.tar.gz
-ENV MUSL_URL https://github.com/quic/musl/archive/aff74b395fbf59cd7e93b3691905aa1af6c0778c.tar.gz
-ENV LINUX_URL https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.6.18.tar.xz
-
-ADD build-toolchain.sh /root/hexagon-toolchain/build-toolchain.sh
-
-RUN cd /root/hexagon-toolchain && ./build-toolchain.sh
-
-FROM docker.io/library/debian:11-slim
-# Duplicate deb line as deb-src
-RUN cat /etc/apt/sources.list | sed "s/^deb\ /deb-src /" >> /etc/apt/sources.list
+        git \
+        ninja-build && \
 # Install QEMU build deps for use in CI
-RUN apt update && \
-    DEBIAN_FRONTEND=noninteractive apt install -yy eatmydata && \
-    DEBIAN_FRONTEND=noninteractive eatmydata apt install -yy bison flex git ninja-build && \
     DEBIAN_FRONTEND=noninteractive eatmydata \
     apt build-dep -yy --arch-only qemu
-COPY --from=0 /usr/local /usr/local
-ENV PATH $PATH:/usr/local/bin/
+
+
+ENV TOOLCHAIN_INSTALL /opt
+ENV TOOLCHAIN_RELEASE 15.0.3
+ENV TOOLCHAIN_BASENAME "clang+llvm-${TOOLCHAIN_RELEASE}-cross-hexagon-unknown-linux-musl"
+ENV TOOLCHAIN_URL https://codelinaro.jfrog.io/artifactory/codelinaro-toolchain-for-hexagon/v${TOOLCHAIN_RELEASE}/${TOOLCHAIN_BASENAME}.tar.xz
+
+RUN curl -#SL "$TOOLCHAIN_URL" | tar -xJC "$TOOLCHAIN_INSTALL"
+ENV PATH $PATH:${TOOLCHAIN_INSTALL}/${TOOLCHAIN_BASENAME}/x86_64-linux-gnu/bin