feat: use rustembedded/cross images and use static relocation model to fix cross-compile

.gitlab-ci.yml

@@ -21,33 +21,46 @@ variables:
     - if: '$CI_COMMIT_BRANCH == "next"'
     - if: "$CI_COMMIT_TAG"
   interruptible: true
-  image: "rust:1.56"
+  image: "rust:1.58"
   tags: ["docker"]
+  services: ["docker:dind"]
   variables:
+    DOCKER_HOST: tcp://docker:2375/
+    DOCKER_TLS_CERTDIR: ""
+    DOCKER_DRIVER: overlay2
+    SHARED_PATH: $CI_PROJECT_DIR/shared/
     CARGO_PROFILE_RELEASE_LTO: "true"
     CARGO_PROFILE_RELEASE_CODEGEN_UNITS: "1"
     CARGO_INCREMENTAL: "false" # https://matklad.github.io/2021/09/04/fast-rust-builds.html#ci-workflow
   before_script:
     - 'echo "Building for target $TARGET"'
-    - "rustc --version && cargo --version && rustup show" # Print version info for debugging
-    - "rustup target add $TARGET"
+    - "rustup show && rustc --version && cargo --version" # Print version info for debugging
     # If provided, bring in caching through sccache, which uses an external S3 endpoint to store compilation results:
     - if [ -n "${SCCACHE_BIN_URL}" ]; then curl $SCCACHE_BIN_URL --output /sccache && chmod +x /sccache && export RUSTC_WRAPPER=/sccache; fi
-    # Make sure that cc-rs links the correct libraries statically when cross-compiling
-    # See https://github.com/alexcrichton/cc-rs#external-configuration-via-environment-variables for more information
-    - 'export CARGO_BUILD_RUSTFLAGS="-L$TARGET_HOME/lib -latomic" CXXSTDLIB="static=stdc++"'
-    # Make sure that rust-bindgen uses the correct include path when cross-compiling
-    # See https://github.com/rust-lang/rust-bindgen#environment-variables for more information
-    - 'export BINDGEN_EXTRA_CLANG_ARGS="-I$TARGET_C_INCLUDE_PATH"'
   script:
-    - time cargo build --target $TARGET --release
+    # install cross-compiling prerequisites
+    - 'apt-get update && apt-get install -y docker.io && docker version' # install docker
+    - 'cargo install cross && cross --version' # install cross
+    # fix cargo and rustup mounts from this container (https://gitlab.com/gitlab-org/gitlab-foss/-/issues/41227)
+    - 'mkdir -p $SHARED_PATH/cargo'
+    - 'cp -r $CARGO_HOME/bin $SHARED_PATH/cargo'
+    - 'cp -r $RUSTUP_HOME $SHARED_PATH'
+    - 'export CARGO_HOME=$SHARED_PATH/cargo RUSTUP_HOME=$SHARED_PATH/rustup'
+    # cross-compile conduit for target
+    - 'time ./cross/build.sh --locked --release'
     - 'cp "target/$TARGET/release/conduit" "conduit-$TARGET"'
+  cache:
+    # https://doc.rust-lang.org/cargo/guide/cargo-home.html#caching-the-cargo-home-in-ci
+    - key: 'cargo-cache-$TARGET'
+      paths:
+        - $SHARED_PATH/cargo/registry/index
+        - $SHARED_PATH/cargo/registry/cache
+        - $SHARED_PATH/cargo/git/db
   artifacts:
     expire_in: never
 
 build:release:cargo:x86_64-unknown-linux-musl-with-debug:
   extends: .build-cargo-shared-settings
-  image: messense/rust-musl-cross:x86_64-musl
   variables:
     CARGO_PROFILE_RELEASE_DEBUG: 2 # Enable debug info for flamegraph profiling
     TARGET: "x86_64-unknown-linux-musl"
@@ -61,7 +74,6 @@ build:release:cargo:x86_64-unknown-linux-musl-with-debug:
 
 build:release:cargo:x86_64-unknown-linux-musl:
   extends: .build-cargo-shared-settings
-  image: messense/rust-musl-cross:x86_64-musl
   variables:
     TARGET: "x86_64-unknown-linux-musl"
   artifacts:
@@ -72,7 +84,6 @@ build:release:cargo:x86_64-unknown-linux-musl:
 
 build:release:cargo:arm-unknown-linux-musleabihf:
   extends: .build-cargo-shared-settings
-  image: messense/rust-musl-cross:arm-musleabihf
   variables:
     TARGET: "arm-unknown-linux-musleabihf"
   artifacts:
@@ -83,7 +94,6 @@ build:release:cargo:arm-unknown-linux-musleabihf:
 
 build:release:cargo:armv7-unknown-linux-musleabihf:
   extends: .build-cargo-shared-settings
-  image: messense/rust-musl-cross:armv7-musleabihf
   variables:
     TARGET: "armv7-unknown-linux-musleabihf"
   artifacts:
@@ -94,7 +104,6 @@ build:release:cargo:armv7-unknown-linux-musleabihf:
 
 build:release:cargo:aarch64-unknown-linux-musl:
   extends: .build-cargo-shared-settings
-  image: messense/rust-musl-cross:aarch64-musl
   variables:
     TARGET: "aarch64-unknown-linux-musl"
   artifacts: