Bug 1692416 - Add a toolchain for arm64 mac cbindgen. r=firefox-build-system-reviewers,andi,dmajor

Differential Revision: https://phabricator.services.mozilla.com/D104978

taskcluster/ci/toolchain/cbindgen.yml

@@ -46,6 +46,21 @@ macosx64-cbindgen:
             - linux64-rust-macos-1.47
             - macosx64-sdk-10.12
 
+macosx64-aarch64-cbindgen:
+    treeherder:
+        symbol: TM(cbindgen-arm64)
+    worker:
+        docker-image: {in-tree: deb10-toolchain-build}
+    run:
+        arguments: ['aarch64-apple-darwin']
+    fetches:
+        toolchain:
+            - linux64-cctools-port-clang-11
+            - linux64-clang-11
+            - linux64-llvm-dsymutil
+            - linux64-rust-macos-1.49
+            - macosx64-sdk-11.0
+
 win64-cbindgen:
     treeherder:
         symbol: TW64(cbindgen)

taskcluster/scripts/misc/build-cbindgen.sh

@@ -25,15 +25,21 @@ if [ -n "$TOOLTOOL_MANIFEST" ]; then
 fi
 
 # OSX cross builds are a bit harder
-if [ "$TARGET" == "x86_64-apple-darwin" ]; then
+case "$TARGET" in
+*-apple-darwin)
   export PATH="$MOZ_FETCHES_DIR/llvm-dsymutil/bin:$PATH"
   export PATH="$MOZ_FETCHES_DIR/cctools/bin:$PATH"
   export RUSTFLAGS="-C linker=$GECKO_PATH/taskcluster/scripts/misc/osx-cross-linker"
-elif [ "$TARGET" == "x86_64-unknown-linux-gnu" ]; then
+  if test "$TARGET" = "aarch64-apple-darwin"; then
+    export SDK_VER=11.0
+  fi
+  ;;
+x86_64-unknown-linux-gnu)
   export CC="$MOZ_FETCHES_DIR/clang/bin/clang"
   export CFLAGS_x86_64_unknown_linux_gnu="--sysroot=$MOZ_FETCHES_DIR/sysroot"
   export RUSTFLAGS="-C linker=$CC -C link-arg=--sysroot=$MOZ_FETCHES_DIR/sysroot"
-fi
+  ;;
+esac
 
 export PATH="$(cd $MOZ_FETCHES_DIR && pwd)/rustc/bin:$PATH"
 

taskcluster/scripts/misc/osx-cross-linker

@@ -1,7 +1,7 @@
 exec $MOZ_FETCHES_DIR/clang/bin/clang -v \
-  -fuse-ld=$MOZ_FETCHES_DIR/cctools/bin/x86_64-apple-darwin-ld \
-  -mmacosx-version-min=10.12 \
+  -fuse-ld=$MOZ_FETCHES_DIR/cctools/bin/$TARGET-ld \
+  -mmacosx-version-min=${SDK_VER:-10.12} \
   -target $TARGET \
   -B $MOZ_FETCHES_DIR/cctools/bin \
-  -isysroot $MOZ_FETCHES_DIR/MacOSX10.12.sdk \
+  -isysroot $MOZ_FETCHES_DIR/MacOSX${SDK_VER:-10.12}.sdk \
   "$@"