[CI] Add libc++ build to nightly

Signed-off-by: Sarnie, Nick <[email protected]>

Author: sarnex

.github/workflows/sycl-linux-build.yml

@@ -186,6 +186,11 @@ jobs:
     - name: check-llvm
       if: always() && !cancelled() && contains(inputs.changes, 'llvm')
       run: |
+        if [[ "${{ inputs.build_configure_extra_args }}" == *"--use-libcxx"* ]]; then
+	  # https://github.com/llvm/llvm-project/issues/59429
+	  export LIT_FILTER_OUT="ExecutionEngine/MCJIT"
+        fi
+
         cmake --build $GITHUB_WORKSPACE/build --target check-llvm
     - name: check-clang
       if: always() && !cancelled() && contains(inputs.changes, 'clang')

.github/workflows/sycl-nightly.yml

@@ -51,6 +51,20 @@ jobs:
 
       artifact_archive_name: sycl_linux_oneapi.tar.zst
 
+  ubuntu2404_libcxx_build:
+    if: github.repository == 'intel/llvm'
+    uses: ./.github/workflows/sycl-linux-build.yml
+    secrets: inherit
+    with:
+      build_cache_root: "/__w/"
+      build_cache_suffix: libcxx
+      build_artifact_suffix: libcxx
+      build_configure_extra_args: --use-libcxx -DLLVM_SPIRV_ENABLE_LIBSPIRV_DIS=OFF
+      cc: clang-18
+      cxx: clang++-18
+
+      artifact_archive_name: sycl_linux_oneapi.tar.zst
+
   ubuntu2204_test:
     needs: [ubuntu2204_build]
     if: ${{ always() && !cancelled() && needs.ubuntu2204_build.outputs.build_conclusion == 'success' }}