Bug 1678154 - Build compiler-rt for aarch64 macos. r=firefox-build-sy…

…stem-reviewers,dmajor

Differential Revision: https://phabricator.services.mozilla.com/D97696

taskcluster/ci/toolchain/misc.yml

@@ -359,3 +359,21 @@ macosx64-sdk-11.0:
         toolchain-artifact: project/gecko/mac-sdk/MacOSX11.0.sdk.tar.zst
     # Expiry similar to that of fetches
     expires-after: 1000 years
+
+macosx64-aarch64-compiler-rt-11:
+    description: "macOS aarch64 Compiler-rt for Clang 11 toolchain build"
+    treeherder:
+        symbol: TM(aarch64-crt)
+    run:
+        using: toolchain-script
+        script: build-compiler-rt.sh
+        arguments:
+            - aarch64-apple-darwin
+        toolchain-artifact: public/build/compiler-rt.tar.zst
+    fetches:
+        fetch:
+            - clang-11
+        toolchain:
+            - linux64-cctools-port-clang-11
+            - linux64-clang-11-macosx-cross
+            - macosx64-sdk-11.0

taskcluster/scripts/misc/build-compiler-rt.sh

@@ -0,0 +1,43 @@
+#!/bin/sh
+
+set -e
+
+[ "$1" != "aarch64-apple-darwin" ] && echo $1 is not supported yet && exit 1
+
+mkdir compiler-rt
+cd compiler-rt
+
+cmake \
+  $MOZ_FETCHES_DIR/llvm-project/compiler-rt \
+  -GNinja \
+  -DCMAKE_C_COMPILER=$MOZ_FETCHES_DIR/clang/bin/clang \
+  -DCMAKE_CXX_COMPILER=$MOZ_FETCHES_DIR/clang/bin/clang++ \
+  -DCMAKE_LINKER=$MOZ_FETCHES_DIR/cctools/bin/aarch64-apple-darwin-ld \
+  -DCMAKE_LIPO=$MOZ_FETCHES_DIR/cctools/bin/lipo \
+  -DCMAKE_AR=$MOZ_FETCHES_DIR/cctools/bin/aarch64-apple-darwin-ar \
+  -DCMAKE_BUILD_TYPE=Release \
+  -DLLVM_ENABLE_ASSERTIONS=OFF \
+  -DLLVM_CONFIG_PATH=$MOZ_FETCHES_DIR/clang/bin/llvm-config \
+  -DCMAKE_C_FLAGS="-target aarch64-apple-darwin -mcpu=apple-a12 -B $MOZ_FETCHES_DIR/cctools/bin -isysroot $MOZ_FETCHES_DIR/MacOSX11.0.sdk" \
+  -DCMAKE_CXX_FLAGS="-target aarch64-apple-darwin -mcpu=apple-a12 -B $MOZ_FETCHES_DIR/cctools/bin -isysroot $MOZ_FETCHES_DIR/MacOSX11.0.sdk" \
+  -DCMAKE_SYSTEM_NAME=Darwin \
+  -DCMAKE_SYSTEM_VERSION=11.0 \
+  -DDARWIN_osx_ARCHS=arm64 \
+  -DDARWIN_osx_SYSROOT=$MOZ_FETCHES_DIR/MacOSX11.0.sdk \
+  -DLLVM_DEFAULT_TARGET_TRIPLE=aarch64-apple-darwin \
+  -DDARWIN_macosx_OVERRIDE_SDK_VERSION=11.0 \
+  -DDARWIN_osx_BUILTIN_ARCHS=arm64
+
+# compiler-rt build script expects to find `codesign` in $PATH.
+# Give it a fake one.
+echo "#!/bin/sh" > codesign
+chmod +x codesign
+
+PATH=$PATH:$PWD ninja
+
+cd ..
+
+tar -cf - compiler-rt/lib/darwin | python3 $GECKO_PATH/taskcluster/scripts/misc/zstdpy > "compiler-rt.tar.zst"
+
+mkdir -p "$UPLOAD_DIR"
+mv "compiler-rt.tar.zst" "$UPLOAD_DIR"