Add option YAML_ENABLE_PIC=ON

Bumps the github-actions group with 1 update: [actions/checkout](https://github.com/actions/checkout).

- [Release notes](https://github.com/actions/checkout/releases)
- [Commits](https://github.com/actions/checkout/compare/v2...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
...

Signed-off-by: dependabot[bot] <support@github.com>

.bazelignore

@@ -0,0 +1 @@
+test/gtest-1.11.0

.github/dependabot.yml

@@ -0,0 +1,11 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+    groups:
+      github-actions:
+        patterns:
+          - "*"
+

.github/workflows/build.yml

@@ -6,13 +6,18 @@ on:
     branches: [ master ]
   workflow_dispatch:
 permissions: read-all
+defaults:
+  run:
+    shell: bash
 jobs:
   cmake-build:
       strategy:
         fail-fast: false
         matrix:
           os: [ubuntu-latest, windows-latest, macos-latest]
+          cxx_standard: [11, 17, 20]
           build: [static, shared]
+          googletest: [build, system]
           generator: ["Default Generator", "MinGW Makefiles"]
           exclude:
           - os: macos-latest
@@ -21,34 +26,78 @@ jobs:
             generator: "MinGW Makefiles"
           - os: ubuntu-latest
             generator: "MinGW Makefiles"
+          - os: macos-latest
+            googletest: system
+          - os: windows-latest
+            googletest: system
       env:
         YAML_BUILD_SHARED_LIBS: ${{ matrix.build == 'shared' && 'ON' || 'OFF' }}
-        YAML_CPP_BUILD_TESTS: 'ON'
+        YAML_USE_SYSTEM_GTEST: ${{ matrix.googletest == 'system' && 'ON' || 'OFF' }}
         CMAKE_GENERATOR: >-
           ${{format(matrix.generator != 'Default Generator' && '-G "{0}"' || '', matrix.generator)}}
+        CMAKE_INSTALL_PREFIX: "${{ github.workspace }}/install-prefix"
+        CMAKE_BUILD_TYPE: Debug
+        CMAKE_CXX_FLAGS_DEBUG: ${{ matrix.googletest == 'build' && '-g -D_GLIBCXX_DEBUG -D_GLIBCXX_DEBUG_PEDANTIC' || '-g' }} 
       runs-on: ${{ matrix.os }}
       steps:
-        - uses: actions/checkout@v2
 
-        - name: Get number of CPU cores
-          uses: SimenB/github-actions-cpu-cores@v1
+        - uses: awalsh128/cache-apt-pkgs-action@latest
+          if: matrix.os == 'ubuntu-latest'
+          with:
+            packages: googletest libgmock-dev libgtest-dev
+            version: 1.0
+
+        - uses: actions/checkout@v4
+
+        - name: Configure
+          run: |
+            cmake \
+              ${{ env.CMAKE_GENERATOR }} \
+              -S "${{ github.workspace }}" \
+              -B build \
+              -D CMAKE_CXX_STANDARD=${{ matrix.cxx_standard }} \
+              -D CMAKE_INSTALL_PREFIX="${{ env.CMAKE_INSTALL_PREFIX }}" \
+              -D CMAKE_BUILD_TYPE=${{ env.CMAKE_BUILD_TYPE }} \
+              -D CMAKE_CXX_FLAGS_DEBUG="${{ env.CMAKE_CXX_FLAGS_DEBUG }}" \
+              -D YAML_BUILD_SHARED_LIBS=${{ env.YAML_BUILD_SHARED_LIBS }} \
+              -D YAML_USE_SYSTEM_GTEST=${{ env.YAML_USE_SYSTEM_GTEST }} \
+              -D YAML_CPP_BUILD_TESTS=ON
 
         - name: Build
-          shell: bash
           run: |
-            cmake ${{ env.CMAKE_GENERATOR }} -S "${{ github.workspace }}" -B build -DYAML_BUILD_SHARED_LIBS=${{ env.YAML_BUILD_SHARED_LIBS }}
-            cd build && cmake --build . --parallel ${{ steps.cpu-cores.outputs.count }}
-            
-        - name: Build Tests
-          shell: bash
-          run: |
-            cmake ${{ env.CMAKE_GENERATOR }} -S "${{ github.workspace }}" -B build -DYAML_BUILD_SHARED_LIBS=${{ env.YAML_BUILD_SHARED_LIBS }} -DYAML_CPP_BUILD_TESTS=${{ env.YAML_CPP_BUILD_TESTS }}
-            cd build && cmake --build . --parallel ${{ steps.cpu-cores.outputs.count }}
+            cmake \
+              --build build \
+              --config ${{ env.CMAKE_BUILD_TYPE }} \
+              --verbose \
+              --parallel
 
         - name: Run Tests
           shell: bash
           run: |
-            cd build && ctest -C Debug --output-on-failure --verbose
+            ctest \
+              --test-dir build \
+              --build-config ${{ env.CMAKE_BUILD_TYPE }} \
+              --output-on-failure \
+              --verbose
+
+        - name: Install
+          run: cmake --install build --config ${{ env.CMAKE_BUILD_TYPE }}
+
+        - name: Configure CMake package test
+          run: |
+            cmake \
+              ${{ env.CMAKE_GENERATOR }} \
+              -S "${{ github.workspace }}/test/cmake" \
+              -B consumer-build \
+              -D CMAKE_BUILD_TYPE=${{ env.CMAKE_BUILD_TYPE }} \
+              -D CMAKE_PREFIX_PATH="${{ env.CMAKE_INSTALL_PREFIX }}"
+
+        - name: Build CMake package test
+          run: |
+            cmake \
+              --build consumer-build \
+              --config ${{ env.CMAKE_BUILD_TYPE }} \
+              --verbose
 
   bazel-build:
       strategy:
@@ -56,17 +105,34 @@ jobs:
           os: [ubuntu-latest, windows-latest, macos-latest]
       runs-on: ${{ matrix.os }}
       steps:
-        - uses: actions/checkout@v2
+        - uses: actions/checkout@v4
 
         - name: Build
-          shell: bash
           run: |
             cd "${{ github.workspace }}"
             bazel build :all
 
         - name: Test
-          shell: bash
           run: |
             cd "${{ github.workspace }}"
             bazel test test
 
+  bzlmod-build:
+      strategy:
+        matrix:
+          os: [ubuntu-latest, windows-latest, macos-latest]
+      runs-on: ${{ matrix.os }}
+      steps:
+        - uses: actions/checkout@v4
+
+        - name: Build
+          shell: bash
+          run: |
+            cd "${{ github.workspace }}"
+            bazel build --enable_bzlmod :all
+
+        - name: Test
+          shell: bash
+          run: |
+            cd "${{ github.workspace }}"
+            bazel test --enable_bzlmod test

.github/workflows/bzlmod-archive.yml

@@ -0,0 +1,19 @@
+name: Bazel Release
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  # A release archive is required for bzlmod
+  # See: https://blog.bazel.build/2023/02/15/github-archive-checksum.html
+  bazel-release-archive:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - run: git archive $GITHUB_REF -o "yaml-cpp-${GITHUB_REF:10}.tar.gz"
+      - run: gh release upload ${GITHUB_REF:10} "yaml-cpp-${GITHUB_REF:10}.tar.gz"
+        env:
+          GH_TOKEN: ${{ github.token }}

CMakeLists.txt

@@ -1,5 +1,6 @@
-# 3.5 is actually available almost everywhere, but this a good minimum
-cmake_minimum_required(VERSION 3.4)
+# 3.5 is actually available almost everywhere, but this a good minimum.
+# 3.14 as the upper policy limit avoids CMake deprecation warnings.
+cmake_minimum_required(VERSION 3.4...3.14)
 
 # enable MSVC_RUNTIME_LIBRARY target property
 # see https://cmake.org/cmake/help/latest/policy/CMP0091.html
@@ -24,13 +25,19 @@ option(YAML_CPP_BUILD_CONTRIB "Enable yaml-cpp contrib in library" ON)
 option(YAML_CPP_BUILD_TOOLS "Enable parse tools" ON)
 option(YAML_BUILD_SHARED_LIBS "Build yaml-cpp shared library" ${BUILD_SHARED_LIBS})
 option(YAML_CPP_INSTALL "Enable generation of yaml-cpp install targets" ${YAML_CPP_MAIN_PROJECT})
-option(YAML_CPP_FORMAT_SOURCE "Format source" ON)
+option(YAML_CPP_FORMAT_SOURCE "Format source" ${YAML_CPP_MAIN_PROJECT})
+option(YAML_CPP_DISABLE_UNINSTALL  "Disable uninstallation of yaml-cpp" OFF)
+option(YAML_USE_SYSTEM_GTEST "Use system googletest if found" OFF)
+option(YAML_ENABLE_PIC "Use Position-Independent Code " ON)
+
 cmake_dependent_option(YAML_CPP_BUILD_TESTS
   "Enable yaml-cpp tests" OFF
   "BUILD_TESTING;YAML_CPP_MAIN_PROJECT" OFF)
 cmake_dependent_option(YAML_MSVC_SHARED_RT
   "MSVC: Build yaml-cpp with shared runtime libs (/MD)" ON
   "CMAKE_SYSTEM_NAME MATCHES Windows" OFF)
+set(YAML_CPP_INSTALL_CMAKEDIR "${CMAKE_INSTALL_LIBDIR}/cmake/yaml-cpp"
+  CACHE STRING "Path to install the CMake package to")
  
 if (YAML_CPP_FORMAT_SOURCE)
     find_program(YAML_CPP_CLANG_FORMAT_EXE NAMES clang-format)
@@ -85,7 +92,7 @@ set_property(TARGET yaml-cpp
     CXX_STANDARD_REQUIRED ON)
 
 if (NOT YAML_BUILD_SHARED_LIBS)
-  set_property(TARGET yaml-cpp PROPERTY POSITION_INDEPENDENT_CODE ON)
+      set_property(TARGET yaml-cpp PROPERTY POSITION_INDEPENDENT_CODE ${YAML_ENABLE_PIC})
 endif()
 
 target_include_directories(yaml-cpp
@@ -143,13 +150,12 @@ set_target_properties(yaml-cpp PROPERTIES
   PROJECT_LABEL "yaml-cpp ${yaml-cpp-label-postfix}"
   DEBUG_POSTFIX "${CMAKE_DEBUG_POSTFIX}")
 
-set(CONFIG_EXPORT_DIR "${CMAKE_INSTALL_LIBDIR}/cmake/yaml-cpp")
-set(EXPORT_TARGETS yaml-cpp)
+set(EXPORT_TARGETS yaml-cpp::yaml-cpp)
 configure_package_config_file(
   "${PROJECT_SOURCE_DIR}/yaml-cpp-config.cmake.in"
   "${PROJECT_BINARY_DIR}/yaml-cpp-config.cmake"
-  INSTALL_DESTINATION "${CONFIG_EXPORT_DIR}"
-  PATH_VARS CMAKE_INSTALL_INCLUDEDIR CMAKE_INSTALL_LIBDIR CONFIG_EXPORT_DIR YAML_BUILD_SHARED_LIBS)
+  INSTALL_DESTINATION "${YAML_CPP_INSTALL_CMAKEDIR}"
+  PATH_VARS CMAKE_INSTALL_INCLUDEDIR CMAKE_INSTALL_LIBDIR)
 unset(EXPORT_TARGETS)
 
 write_basic_package_version_file(
@@ -169,15 +175,14 @@ if (YAML_CPP_INSTALL)
                 FILES_MATCHING PATTERN "*.h")
   install(EXPORT yaml-cpp-targets
     NAMESPACE yaml-cpp::
-    DESTINATION "${CONFIG_EXPORT_DIR}")
+    DESTINATION "${YAML_CPP_INSTALL_CMAKEDIR}")
   install(FILES
       "${PROJECT_BINARY_DIR}/yaml-cpp-config.cmake"
       "${PROJECT_BINARY_DIR}/yaml-cpp-config-version.cmake"
-    DESTINATION "${CONFIG_EXPORT_DIR}")
+    DESTINATION "${YAML_CPP_INSTALL_CMAKEDIR}")
   install(FILES "${PROJECT_BINARY_DIR}/yaml-cpp.pc"
     DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
 endif()
-unset(CONFIG_EXPORT_DIR)
 
 if(YAML_CPP_BUILD_TESTS)
   add_subdirectory(test)
@@ -196,7 +201,7 @@ if (YAML_CPP_FORMAT_SOURCE AND YAML_CPP_CLANG_FORMAT_EXE)
 endif()
 
 # uninstall target
-if(NOT TARGET uninstall)
+if(YAML_CPP_INSTALL AND NOT YAML_CPP_DISABLE_UNINSTALL AND NOT TARGET uninstall)
   configure_file(
     "${CMAKE_CURRENT_SOURCE_DIR}/cmake_uninstall.cmake.in"
     "${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake"

MODULE.bazel

@@ -0,0 +1,14 @@
+"""
+yaml-cpp is a YAML parser and emitter in c++ matching the YAML specification.
+"""
+
+module(
+    name = "yaml-cpp",
+    compatibility_level = 1,
+    version = "0.8.0",
+)
+
+bazel_dep(name = "platforms", version = "0.0.7")
+bazel_dep(name = "rules_cc", version = "0.0.8")
+
+bazel_dep(name = "googletest", version = "1.14.0", dev_dependency = True)

README.md

@@ -31,6 +31,17 @@ cmake [-G generator] [-DYAML_BUILD_SHARED_LIBS=on|OFF] ..
 
   * `yaml-cpp` builds a static library by default, you may want to build a shared library by specifying `-DYAML_BUILD_SHARED_LIBS=ON`.
 
+  * [Debug mode of the GNU standard C++
+    library](https://gcc.gnu.org/onlinedocs/libstdc++/manual/debug_mode.html)
+    can be used when both `yaml-cpp` and client code is compiled with the
+    `_GLIBCXX_DEBUG` flag (e.g. by calling CMake with `-D
+    CMAKE_CXX_FLAGS_DEBUG='-g -D_GLIBCXX_DEBUG'` option).
+
+    Note that for `yaml-cpp` unit tests to run successfully, the _GoogleTest_
+    library also must be built with this flag, i.e. the system one cannot be
+    used (the _YAML_USE_SYSTEM_GTEST_ CMake option must be _OFF_, which is the
+    default).
+
   * For more options on customizing the build, see the [CMakeLists.txt](https://github.com/jbeder/yaml-cpp/blob/master/CMakeLists.txt) file.
 
 #### 2. Build it!
@@ -38,6 +49,29 @@ cmake [-G generator] [-DYAML_BUILD_SHARED_LIBS=on|OFF] ..
 
 **Note:** To clean up, just remove the `build` directory.
 
+## How to Integrate it within your project using CMake
+
+You can use for example FetchContent :
+
+```cmake
+include(FetchContent)
+
+FetchContent_Declare(
+  yaml-cpp
+  GIT_REPOSITORY https://github.com/jbeder/yaml-cpp.git
+  GIT_TAG <tag_name> # Can be a tag (yaml-cpp-x.x.x), a commit hash, or a branch name (master)
+)
+FetchContent_GetProperties(yaml-cpp)
+
+if(NOT yaml-cpp_POPULATED)
+  message(STATUS "Fetching yaml-cpp...")
+  FetchContent_Populate(yaml-cpp)
+  add_subdirectory(${yaml-cpp_SOURCE_DIR} ${yaml-cpp_BINARY_DIR})
+endif()
+
+target_link_libraries(YOUR_LIBRARY PUBLIC yaml-cpp::yaml-cpp) # The library or executable that require yaml-cpp library
+```
+
 ## Recent Releases
 
 [yaml-cpp 0.6.0](https://github.com/jbeder/yaml-cpp/releases/tag/yaml-cpp-0.6.0) released! This release requires C++11, and no longer depends on Boost.

docs/How-To-Emit-YAML.md

@@ -155,15 +155,9 @@ produces
 We overload `operator <<` for `std::vector`, `std::list`, and `std::map`, so you can write stuff like:
 
 ```cpp
-std::vector <int> squares;
-squares.push_back(1);
-squares.push_back(4);
-squares.push_back(9);
-squares.push_back(16);
+std::vector <int> squares = {1, 4, 9, 16};
 
-std::map <std::string, int> ages;
-ages["Daniel"] = 26;
-ages["Jesse"] = 24;
+std::map <std::string, int> ages = {{"Daniel", 26}, {"Jesse", 24}};
 
 YAML::Emitter out;
 out << YAML::BeginSeq;

include/yaml-cpp/emitfromevents.h

@@ -23,6 +23,7 @@ class Emitter;
 class EmitFromEvents : public EventHandler {
  public:
   EmitFromEvents(Emitter& emitter);
+  ~EmitFromEvents() override = default;
 
   void OnDocumentStart(const Mark& mark) override;
   void OnDocumentEnd() override;

include/yaml-cpp/node/convert.h

@@ -18,7 +18,7 @@
 #include <valarray>
 #include <vector>
 
-#if __cplusplus >= 201703L
+#if ((defined(_MSVC_LANG) && _MSVC_LANG >= 201703L) || __cplusplus >= 201703L)
 #include <string_view>
 #endif
 
@@ -93,7 +93,7 @@ struct convert<char[N]> {
   static Node encode(const char* rhs) { return Node(rhs); }
 };
 
-#if __cplusplus >= 201703L
+#if ((defined(_MSVC_LANG) && _MSVC_LANG >= 201703L) || __cplusplus >= 201703L)
 template <>
 struct convert<std::string_view> {
   static Node encode(std::string_view rhs) { return Node(std::string(rhs)); }

include/yaml-cpp/node/impl.h

@@ -97,7 +97,7 @@ struct as_if {
     if (!node.m_pNode)
       return fallback;
 
-    T t;
+    T t = fallback;
     if (convert<T>::decode(node, t))
       return t;
     return fallback;

src/emitter.cpp

@@ -213,6 +213,7 @@ void Emitter::EmitEndSeq() {
   if (m_pState->CurGroupFlowType() == FlowType::Flow) {
     if (m_stream.comment())
       m_stream << "\n";
+    if (originalType == FlowType::Block || m_pState->HasBegunNode())
       m_stream << IndentTo(m_pState->CurIndent());
     if (originalType == FlowType::Block) {
       m_stream << "[";

test/CMakeLists.txt

@@ -4,11 +4,17 @@ set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
 set(BUILD_MOCK ON CACHE BOOL "" FORCE)
 set(CMAKE_POLICY_DEFAULT_CMP0048 NEW)
 
-add_subdirectory(
+if(YAML_USE_SYSTEM_GTEST)
+  find_package(GTest)
+  if (NOT GTEST_FOUND)
+    message(FATAL_ERROR "system googletest was requested but not found")
+  endif()
+else()
+    add_subdirectory(
       "${CMAKE_CURRENT_SOURCE_DIR}/gtest-1.11.0"
       "${CMAKE_CURRENT_BINARY_DIR}/prefix")
-
-include_directories(SYSTEM "${CMAKE_CURRENT_SOURCE_DIR}/gtest-1.11.0/googletest/include")
+    include_directories(SYSTEM "${CMAKE_CURRENT_SOURCE_DIR}/gtest-1.11.0/googletest/include")
+endif()
 
 set(test-new-api-pattern "new-api/*.cpp")
 set(test-source-pattern "*.cpp" "integration/*.cpp" "node/*.cpp")
@@ -33,11 +39,12 @@ target_include_directories(yaml-cpp-tests
 target_compile_options(yaml-cpp-tests
   PRIVATE
     $<$<CXX_COMPILER_ID:Clang>:-Wno-c99-extensions -Wno-variadic-macros -Wno-sign-compare>
-    $<$<CXX_COMPILER_ID:GNU>:-Wno-variadic-macros -Wno-sign-compare>)
+    $<$<CXX_COMPILER_ID:GNU>:-Wno-variadic-macros -Wno-sign-compare -Wno-narrowing>)
 target_link_libraries(yaml-cpp-tests
   PRIVATE
     Threads::Threads
     yaml-cpp
+    gtest
     gmock)
 
 set_property(TARGET yaml-cpp-tests PROPERTY CXX_STANDARD_REQUIRED ON)

test/cmake/CMakeLists.txt

@@ -0,0 +1,21 @@
+cmake_minimum_required(VERSION 3.5)
+project(yaml-cpp-consumer LANGUAGES CXX)
+
+find_package(yaml-cpp CONFIG REQUIRED)
+get_target_property(LIBRARY_TYPE yaml-cpp::yaml-cpp TYPE)
+
+if(LIBRARY_TYPE STREQUAL "SHARED_LIBRARY")
+  if(NOT YAML_CPP_SHARED_LIBS_BUILT)
+    message(FATAL_ERROR "Library type (${LIBRARY_TYPE}) contradicts config: ${YAML_CPP_SHARED_LIBS_BUILT}")
+  endif()
+else()
+  if(YAML_CPP_SHARED_LIBS_BUILT)
+    message(FATAL_ERROR "Library type (${LIBRARY_TYPE}) contradicts config: ${YAML_CPP_SHARED_LIBS_BUILT}")
+  endif()
+endif()
+
+add_executable(main main.cpp)
+if (NOT DEFINED CMAKE_CXX_STANDARD)
+  set_target_properties(main PROPERTIES CXX_STANDARD 11)
+endif()
+target_link_libraries(main PRIVATE ${YAML_CPP_LIBRARIES})

test/cmake/main.cpp

@@ -0,0 +1,3 @@
+#include "yaml-cpp/yaml.h"
+
+int main(int, char**) { YAML::Parser foo{}; }

test/integration/emitter_test.cpp

@@ -176,6 +176,17 @@ TEST_F(EmitterTest, EmptyFlowSeqWithBegunContent) {
   ]])");
 }
 
+TEST_F(EmitterTest, EmptyFlowSeqInMap) {
+  out << BeginMap;
+  out << Key << Flow << BeginSeq << EndSeq;
+  out << Value << 1;
+  out << Key << 2;
+  out << Value << Flow << BeginSeq << EndSeq;
+  out << EndMap;
+
+  ExpectEmit("[]: 1\n2: []");
+}
+
 TEST_F(EmitterTest, EmptyFlowMapWithBegunContent) {
   out << Flow;
   out << BeginSeq;

util/read.cpp

@@ -20,10 +20,10 @@ class NullEventHandler : public YAML::EventHandler {
   void OnScalar(const Mark&, const std::string&, anchor_t,
                 const std::string&) override {}
   void OnSequenceStart(const Mark&, const std::string&, anchor_t,
-                       YAML::EmitterStyle::value style) override {}
+                       YAML::EmitterStyle::value) override {}
   void OnSequenceEnd() override {}
   void OnMapStart(const Mark&, const std::string&, anchor_t,
-                  YAML::EmitterStyle::value style) override {}
+                  YAML::EmitterStyle::value) override {}
   void OnMapEnd() override {}
 };
 

util/sandbox.cpp

@@ -18,10 +18,10 @@ class NullEventHandler : public YAML::EventHandler {
   void OnScalar(const Mark&, const std::string&, anchor_t,
                 const std::string&) override {}
   void OnSequenceStart(const Mark&, const std::string&, anchor_t,
-                       YAML::EmitterStyle::value style) override {}
+                       YAML::EmitterStyle::value) override {}
   void OnSequenceEnd() override {}
   void OnMapStart(const Mark&, const std::string&, anchor_t,
-                  YAML::EmitterStyle::value style) override {}
+                  YAML::EmitterStyle::value) override {}
   void OnMapEnd() override {}
 };
 

yaml-cpp-config.cmake.in

@@ -11,12 +11,23 @@ set_and_check(YAML_CPP_INCLUDE_DIR "@PACKAGE_CMAKE_INSTALL_INCLUDEDIR@")
 set_and_check(YAML_CPP_LIBRARY_DIR "@PACKAGE_CMAKE_INSTALL_LIBDIR@")
 
 # Are we building shared libraries?
-set(YAML_CPP_SHARED_LIBS_BUILT "@PACKAGE_YAML_BUILD_SHARED_LIBS@")
+set(YAML_CPP_SHARED_LIBS_BUILT @YAML_BUILD_SHARED_LIBS@)
 
 # Our library dependencies (contains definitions for IMPORTED targets)
-include(@PACKAGE_CONFIG_EXPORT_DIR@/yaml-cpp-targets.cmake)
+include("${CMAKE_CURRENT_LIST_DIR}/yaml-cpp-targets.cmake")
 
 # These are IMPORTED targets created by yaml-cpp-targets.cmake
 set(YAML_CPP_LIBRARIES "@EXPORT_TARGETS@")
 
-check_required_components(@EXPORT_TARGETS@)
+# Protect against multiple inclusion, which would fail when already imported targets are added once more.
+if(NOT TARGET yaml-cpp)
+  add_library(yaml-cpp INTERFACE IMPORTED) 
+  target_link_libraries(yaml-cpp INTERFACE yaml-cpp::yaml-cpp) 
+  if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.17)
+    set_target_properties(yaml-cpp PROPERTIES 
+      DEPRECATION "The target yaml-cpp is deprecated and will be removed in version 0.10.0. Use the yaml-cpp::yaml-cpp target instead."
+    )
+  endif()
+endif()
+
+check_required_components(yaml-cpp)