Add tests for GCC support window.

Note: gcc only supports docker images down to 9.5, and the 7.3 image is very old and problematic.  A follow-up change might enable testing for GCC 7.3, which is our minimal supported version
PiperOrigin-RevId: 529885733

.github/workflows/test_cpp.yml

@@ -51,6 +51,26 @@ jobs:
           bazel-cache: cpp_linux/${{ matrix.config.name }}
           bazel: test ${{ matrix.targets }} ${{ matrix.config.flags }}
 
+  linux-gcc:
+    strategy:
+      fail-fast: false   # Don't cancel all jobs if one fails.
+      matrix:
+        version: ['9.5', '13.1']
+    name: Linux GCC ${{ matrix.version }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout pending changes
+        uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3.3.0
+        with:
+          ref: ${{ inputs.safe-checkout }}
+      - name: Run tests
+        uses: protocolbuffers/protobuf-ci/bazel-docker@v1
+        with:
+          image: us-docker.pkg.dev/protobuf-build/containers/test/linux/gcc:${{ matrix.version }}-5.4.0-2d15d9e888c9e7f90961dbd3afc8ea209717fb4b
+          credentials: ${{ secrets.GAR_SERVICE_ACCOUNT }}
+          bazel-cache: cpp_linux/gcc-${{ matrix.version }}
+          bazel: test //pkg/... //src/... @com_google_protobuf_examples//...
+
   linux-release:
     strategy:
       fail-fast: false   # Don't cancel all jobs if one fails.
@@ -122,7 +142,6 @@ jobs:
             /test.sh ${{ matrix.flags}} ${{ env.CCACHE_CMAKE_FLAGS }}
             -DCMAKE_CXX_STANDARD=14 -Dprotobuf_BUILD_TESTS=ON
             -Dprotobuf_USE_EXTERNAL_GTEST=ON -Dprotobuf_ABSL_PROVIDER=package
-              
 
   linux-cmake-install:
     name: Linux CMake Install
@@ -182,6 +201,36 @@ jobs:
             cmake .. -DCMAKE_CXX_STANDARD=14 \&\&
             cmake --build .
 
+  linux-cmake-gcc:
+    name: Linux CMake GCC
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout pending changes
+        uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3.3.0
+        with:
+          ref: ${{ inputs.safe-checkout }}
+          submodules: recursive
+
+      - name: Setup ccache
+        uses: protocolbuffers/protobuf-ci/ccache@v1
+        with:
+          cache-prefix: linux-cmake-gcc
+
+      - name: Run tests
+        uses: protocolbuffers/protobuf-ci/docker@v1
+        with:
+          image: us-docker.pkg.dev/protobuf-build/containers/test/linux/gcc:13.1-5.4.0-307caa02808127e49720f3e77d6a9f3b3ef5a915
+          credentials: ${{ secrets.GAR_SERVICE_ACCOUNT }}
+          entrypoint: bash
+          command: >-
+              -c 'set -ex;
+              cd /workspace;
+              ccache -z;
+              cmake . -DCMAKE_CXX_STANDARD=14 ${{ env.CCACHE_CMAKE_FLAGS }};
+              cmake --build . --parallel 20;
+              ctest --verbose --parallel 20;
+              ccache -s'
+
   linux-cmake-submodules:
     name: Linux CMake Submodules
     runs-on: ubuntu-latest

src/google/protobuf/io/printer_death_test.cc

@@ -90,6 +90,7 @@ class FakeAnnotationCollector : public AnnotationCollector {
  public:
   ~FakeAnnotationCollector() override = default;
 
+  using AnnotationCollector::AddAnnotation;
   void AddAnnotation(size_t begin_offset, size_t end_offset,
                      const std::string& file_path,
                      const std::vector<int>& path) override {

src/google/protobuf/port_def.inc

@@ -1013,6 +1013,12 @@ static_assert(PROTOBUF_CPLUSPLUS_MIN(201402L), "Protobuf only supports C++14 and
 // This error has been generally flaky, but we need to disable it specifically
 // to fix https://github.com/protocolbuffers/protobuf/issues/12313
 #pragma GCC diagnostic ignored "-Wunused-parameter"
+#ifndef __clang__
+// This causes spurious warnings in GCC 13.
+#pragma GCC diagnostic ignored "-Wstringop-overflow"
+// This causes spurious warnings in GCC 13.
+#pragma GCC diagnostic ignored "-Wself-move"
+#endif
 #if __GNUC__ == 12 && __GNUC_MINOR__ < 4
 // Wrong warning emitted when assigning a single char c-string to a std::string
 // in c++20 mode and optimization on.

src/google/protobuf/repeated_field.h

@@ -977,7 +977,7 @@ PROTOBUF_NOINLINE void RepeatedField<Element>::GrowNoAnnotate(int current_size,
       Element* pold = elements();
       // TODO(b/263791665): add absl::is_trivially_relocatable<Element>
       if (std::is_trivial<Element>::value) {
-        memcpy(pnew, pold, current_size * sizeof(Element));
+        memcpy(static_cast<void*>(pnew), pold, current_size * sizeof(Element));
       } else {
         for (Element* end = pnew + current_size; pnew != end; ++pnew, ++pold) {
           ::new (static_cast<void*>(pnew)) Element(std::move(*pold));