[ci] sanitize build under -fno-fast-math and -ffast-math

Author: serge-sans-paille

.github/workflows/sanitizer.yml

@@ -9,15 +9,27 @@ defaults:
 jobs:
   build:
     runs-on: ubuntu-latest
-    name: 'sanitizer - ${{ matrix.sanitizer }}'
+    name: 'sanitizer - ${{ matrix.sanitizer }} ${{ matrix.fastmath }}'
     strategy:
       matrix:
         sanitizer:
           - address
           - undefined
+        fastmath:
+          - "no-fast-math"
+          - "fast-math"
     steps:
     - name: Checkout xsimd
       uses: actions/checkout@v3
+    - name: Setup compiler
+      run: |
+        LLVM_VERSION=20
+        sudo apt-get update || exit 1
+        sudo apt-get --no-install-suggests --no-install-recommends install clang-$LLVM_VERSION || exit 1
+        CC=clang-$LLVM_VERSION
+        echo "CC=$CC" >> $GITHUB_ENV
+        CXX=clang++-$LLVM_VERSION
+        echo "CXX=$CXX" >> $GITHUB_ENV
     - name: Configure build
       run: |
         mkdir _build
@@ -26,9 +38,9 @@ jobs:
                   -DBUILD_BENCHMARK=ON \
                   -DBUILD_EXAMPLES=ON \
                   -DDOWNLOAD_DOCTEST=ON \
-                  -DCMAKE_BUILD_TYPE=Release \
-                  -DCMAKE_CXX_COMPILER=clang++ \
-                  -DCMAKE_CXX_FLAGS='-fsanitize=${{ matrix.sanitizer }}' \
+                  -DCMAKE_BUILD_TYPE=Debug \
+                  -DCMAKE_CXX_COMPILER=$CXX \
+                  -DCMAKE_CXX_FLAGS='-fsanitize=${{ matrix.sanitizer }} -f${{ matrix.fastmath }} -O0 -g -fno-inline' \
                   -G Ninja
     - name: Build
       run: ninja -C _build