workflows: add sanity check for toolchains w/ CXX support

Fluent-bit is written in C, so don't require CXX,
also not from the libs.

Signed-off-by: Thomas Devoogdt <[email protected]>

Author: ThomasDevoogdt

.github/workflows/pr-compile-check.yaml

@@ -102,3 +102,26 @@ jobs:
           echo "$ldd_result" | grep libsqlite3
           echo "$ldd_result" | grep libzstd
         working-directory: build
+
+  # Sanity check for compilation w/ CXX support
+  pr-compile-without-cxx:
+    runs-on: ubuntu-22.04
+    timeout-minutes: 60
+    strategy:
+      fail-fast: false
+    steps:
+      - name: Setup environment
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y bison cmake flex gcc libssl-dev libyaml-dev
+
+      - name: Checkout Fluent Bit code
+        uses: actions/checkout@v4
+
+      - name: Compile w/ CXX support
+        run: |
+          export CXX=/bin/false
+          export nparallel=$(( $(getconf _NPROCESSORS_ONLN) > 8 ? 8 : $(getconf _NPROCESSORS_ONLN) ))
+          cmake ../
+          make -j $nparallel
+        working-directory: build