Add fuzz build to CI

.github/workflows/validate-cpp.yml

@@ -31,6 +31,26 @@ jobs:
       - name: Unit tests
         run: ./unit_tests ${{ matrix.mode }}
 
+  
+  build_fuzzers:
+    name: Build fuzzers [${{ matrix.toolchain }}][${{ matrix.mode }}]
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        mode: [Debug, Release]
+        toolchain: [Clang]
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Setup
+        uses: ./.github/actions/setup-cpp
+        with:
+          toolchain: ${{ matrix.toolchain }}
+
+      - name: Unit tests
+        run: ./build_fuzz_tests ${{ matrix.mode }}
+
   benchmark:
     name: Benchmark [${{ matrix.toolchain }}]
     runs-on: ${{ (matrix.toolchain == 'MSVC') && 'windows-latest' || 'ubuntu-latest'  }}

build_fuzz_tests

@@ -0,0 +1,28 @@
+#!/usr/bin/env sh
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+if [ "$#" -eq 0 ]; then
+  build_type="Debug"
+else
+  build_type="$1"
+fi
+
+export CC=clang
+export CXX=clang++
+
+# Make sure libc++ isn't used, as libfuzzer is linked against stdlibc++ which causes conflicts
+unset CXXFLAGS
+export LDFLAGS=-lstdc++
+
+if which ninja; then
+  set -e
+  cmake -B build -S . -D BUILD_FUZZ_TESTS=ON -D CMAKE_BUILD_TYPE="$build_type" -G Ninja
+else
+  set -e
+  cmake -B build -S . -D BUILD_FUZZ_TESTS=ON -D CMAKE_BUILD_TYPE="$build_type"
+fi
+
+cmake --build build --target fuzz_layout