diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 10d41ac7bc2730597c0bfea7d67561fc7db29804..92ace23d6416f49c3b563fe2077a6e1e25f7384e 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -58,6 +58,8 @@ aggregate-docs:
 # manually.
 .workspace-rules:
   rules:
+    - if: '$CI_ONIRO_BB_LOCAL_CONF_TOOLCHAIN == "clang"'
+      allow_failure: true
     - if: '$CI_PIPELINE_SOURCE == "schedule"'
       variables:
         CI_ONIRO_MANIFEST_URL: "$CI_PROJECT_URL"
diff --git a/.oniro-ci/build-generic.yaml b/.oniro-ci/build-generic.yaml
index 67abc4ad1cf53831e130d9b753b15cbc8b932e16..1e9ae38b1df0ffc62407222735037c99ab9d36c8 100644
--- a/.oniro-ci/build-generic.yaml
+++ b/.oniro-ci/build-generic.yaml
@@ -194,6 +194,9 @@
         # them).
         time devtool finish --remove-work --force "$CI_ONIRO_DEVTOOL_RECIPE_NAME" "$(basename "$CI_ONIRO_DEVTOOL_LAYER_PATH")";
       fi
+  rules:
+    - if: '$CI_ONIRO_BB_LOCAL_CONF_TOOLCHAIN == "clang"'
+      allow_failure: true
 
 # This job is documented in docs/ci/hidden-jobs/build-linux.rst
 .build-linux:
@@ -214,13 +217,25 @@
         time bitbake "$target"
         du -sh tmp
       done
+  parallel:
+    matrix:
+      - CI_ONIRO_BB_LOCAL_CONF_TOOLCHAIN: "clang" 
+        CI_ONIRO_BB_LOCAL_CONF_RUNTIME: "llvm"
+      - CI_ONIRO_BB_LOCAL_CONF_TOOLCHAIN: "gcc"
+        CI_ONIRO_BB_LOCAL_CONF_RUNTIME: "gnu"
 
 # This job is documented in docs/ci/hidden-jobs/build-linux-marix.rst
 .build-linux-matrix:
   extends: .build-linux
   parallel:
     matrix:
-      - CI_ONIRO_BITBAKE_TARGETS: ["oniro-image-base-tests", "oniro-image-extra-tests"]
+      - CI_ONIRO_BB_LOCAL_CONF_TOOLCHAIN: "clang" 
+        CI_ONIRO_BB_LOCAL_CONF_RUNTIME: "llvm"
+        CI_ONIRO_BITBAKE_TARGETS: ["oniro-image-base-tests", "oniro-image-extra-tests"]
+      - CI_ONIRO_BB_LOCAL_CONF_TOOLCHAIN: "gcc"
+        CI_ONIRO_BB_LOCAL_CONF_RUNTIME: "gnu"
+        CI_ONIRO_BITBAKE_TARGETS: ["oniro-image-base-tests", "oniro-image-extra-tests"]
+
 
 # This job is documented in docs/ci/hidden-jobs/build-zephyr.rst
 .build-zephyr:
@@ -238,6 +253,12 @@
       for target in $CI_ONIRO_BITBAKE_TARGETS; do
         time bitbake "$target"
       done
+  parallel:
+    matrix:
+      - CI_ONIRO_BB_LOCAL_CONF_TOOLCHAIN: "clang" 
+        CI_ONIRO_BB_LOCAL_CONF_RUNTIME: "llvm"
+      - CI_ONIRO_BB_LOCAL_CONF_TOOLCHAIN: "gcc"
+        CI_ONIRO_BB_LOCAL_CONF_RUNTIME: "gnu"
 
 # This job is documented in docs/ci/hidden-jobs/build-freertos.rst
 .build-freertos:
@@ -249,6 +270,12 @@
   script:
     - !reference [.bitbake-workspace, script]
     - time bitbake freertos-demo
+  parallel:
+    matrix:
+      - CI_ONIRO_BB_LOCAL_CONF_TOOLCHAIN: "clang" 
+        CI_ONIRO_BB_LOCAL_CONF_RUNTIME: "llvm"
+      - CI_ONIRO_BB_LOCAL_CONF_TOOLCHAIN: "gcc"
+        CI_ONIRO_BB_LOCAL_CONF_RUNTIME: "gnu"
 
 # This job is documented in docs/ci/hidden-jobs/build-recipe.rst
 .build-recipe:
@@ -295,6 +322,12 @@
   artifacts:
     paths:
       - artifacts/
+  parallel:
+    matrix:
+      - CI_ONIRO_BB_LOCAL_CONF_TOOLCHAIN: "clang" 
+        CI_ONIRO_BB_LOCAL_CONF_RUNTIME: "llvm"
+      - CI_ONIRO_BB_LOCAL_CONF_TOOLCHAIN: "gcc"
+        CI_ONIRO_BB_LOCAL_CONF_RUNTIME: "gnu"
 
 .build-wic-image:
   extends: .build-image
@@ -302,6 +335,12 @@
     CI_ONIRO_JOB_ARTIFACTS: "*.wic.* *.bmap"
   script:
     - !reference [.build-image, script]
+  parallel:
+    matrix:
+      - CI_ONIRO_BB_LOCAL_CONF_TOOLCHAIN: "clang" 
+        CI_ONIRO_BB_LOCAL_CONF_RUNTIME: "llvm"
+      - CI_ONIRO_BB_LOCAL_CONF_TOOLCHAIN: "gcc"
+        CI_ONIRO_BB_LOCAL_CONF_RUNTIME: "gnu"
 
 .build-rauc-bundle:
   extends: .build-image