Increase distcheck target in cmake

CMakeLists.txt

@@ -39,6 +39,14 @@ set(CPACK_PACKAGE_VERSION_MAJOR     "${PROJECT_VERSION_MAJOR}")
 set(CPACK_PACKAGE_VERSION_MINOR     "${PROJECT_VERSION_MINOR}")
 set(CPACK_PACKAGE_VERSION_PATCH     "${PROJECT_VERSION_PATCH}")
 set(JSON_C_BUGREPORT                "json-c@googlegroups.com")
+set(CPACK_SOURCE_IGNORE_FILES
+        ${PROJECT_SOURCE_DIR}/build
+        ${PROJECT_SOURCE_DIR}/cmake-build-debug
+        ${PROJECT_SOURCE_DIR}/pack
+        ${PROJECT_SOURCE_DIR}/.idea
+        ${PROJECT_SOURCE_DIR}/.DS_Store
+        ${PROJECT_SOURCE_DIR}/.git
+        ${PROJECT_SOURCE_DIR}/.vscode)
 
 include(CheckSymbolExists)
 include(CheckIncludeFile)
@@ -51,6 +59,17 @@ include(CMakePackageConfigHelpers)
 
 option(BUILD_SHARED_LIBS  "Default to building shared libraries" ON)
 
+# Generate a release merge and test it to verify the correctness of republishing the package.
+ADD_CUSTOM_TARGET(distcheck
+COMMAND make package_source
+    COMMAND tar -xvf "${PROJECT_NAME}-${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}.${PROJECT_VERSION_PATCH}-Source.tar.gz"
+    COMMAND mkdir "${PROJECT_NAME}-${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}.${PROJECT_VERSION_PATCH}-Source/build"
+    COMMAND cmake "${PROJECT_NAME}-${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}.${PROJECT_VERSION_PATCH}-Source/" -B"./${PROJECT_NAME}-${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}.${PROJECT_VERSION_PATCH}-Source/build/"
+    COMMAND make -C "${PROJECT_NAME}-${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}.${PROJECT_VERSION_PATCH}-Source/build"
+    COMMAND make test -C "${PROJECT_NAME}-${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}.${PROJECT_VERSION_PATCH}-Source/build"
+    COMMAND rm -rf "${PROJECT_NAME}-${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}.${PROJECT_VERSION_PATCH}-Source"
+)
+
 # Enable or disable features. By default, all features are turned off.
 option(ENABLE_RDRAND                "Enable RDRAND Hardware RNG Hash Seed"          OFF)
 option(ENABLE_THREADING             "Enable partial threading support."             OFF)