Add some minimal testing with LLVM stable (v19)

Fixes: emscripten-core#11362

Author: sbc100

.circleci/config.yml

@@ -802,6 +802,32 @@ jobs:
             core2.test_exceptions_wasm
             core2.test_pthread_unhandledrejection"
       - upload-test-results
+  test-llvm-stable:
+    executor: focal
+    environment:
+      LANG: "C.UTF-8"
+      EMTEST_SKIP_V8: "1"
+    steps:
+      - run:
+          name: install llvm
+          command: |
+            echo "deb http://apt.llvm.org/focal/ llvm-toolchain-focal-19 main" >> /etc/apt/sources.list
+            wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add -
+            apt-get update
+            apt-get install -q -y clang-19
+      - checkout
+      - run:
+          name: submodule update
+          command: git submodule update --init
+      - pip-install
+      - install-emsdk
+      - install-rust
+      - run:
+          name: configure LLVM
+          command: echo "LLVM_ROOT='/usr/lib/llvm-19/bin'" >> ~/emsdk/.emscripten
+      - run: apt-get install -q -y ninja-build scons ccache
+      - run-tests:
+          test_targets: "core0.test_hello_world"
   test-other:
     executor: focal
     environment:
@@ -979,59 +1005,5 @@ jobs:
 workflows:
   build-test:
     jobs:
-      - ruff
-      - mypy
-      - eslint
-      - build-docs
-      - build-linux
-      - test-sanity:
-          requires:
-            - build-linux
-      - test-posixtest:
-          requires:
-            - build-linux
-      - test-core0:
-          requires:
-            - build-linux
-      - test-core2:
-          requires:
-            - build-linux
-      - test-core3:
-          requires:
-            - build-linux
-      - test-wasm64:
-          requires:
-            - build-linux
-      - test-wasm64-4gb:
-          requires:
-            - build-linux
-      - test-wasm2js1:
-          requires:
-            - build-linux
-      - test-other:
-          requires:
-            - build-linux
-      - test-browser-chrome:
-          requires:
-            - build-linux
-      - test-browser-chrome-2gb:
-          requires:
-            - build-linux
-      - test-browser-chrome-wasm64:
-          requires:
-            - build-linux
-      - test-browser-chrome-wasm64-4gb:
-          requires:
-            - build-linux
-      - test-browser-firefox:
-          requires:
-            - build-linux
-      - test-browser-firefox-wasm64
-      - test-sockets-chrome:
-          requires:
-            - build-linux
-      - test-jsc
-      - test-spidermonkey
-      - test-node-compat
-      - test-windows
-      - test-mac-arm64
+      - test-llvm-stable
+