Update CMakeLists.txt

CMakeLists.txt

@@ -1,11 +1,15 @@
 include(CMakePackageConfigHelpers)
+include(FetchContent)
+
 cmake_minimum_required(VERSION 3.16)
 project(lattice-sdk-cpp LANGUAGES CXX)
 
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED on)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 set(ABSL_PROPAGATE_CXX_STD ON)
+set(ABSL_ENABLE_INSTALL ON)
+set(FETCHCONTENT_QUIET OFF)
 
 ## Get all the Proto generated files
 file(GLOB_RECURSE lattice-sdk_SOURCES src/*.cc)
@@ -23,7 +27,72 @@ target_include_directories(${PROJECT_NAME}
 )
 
 # Find system-installed gRPC and Protobuf libraries
-find_package(Protobuf 29.0.0 CONFIG REQUIRED)
-find_package(gRPC 1.68.0 CONFIG REQUIRED)
+
+# Specify the dependencies
+option(USE_SYSTEM_GRPC_PROTOBUF "Use system installed gRPC" OFF)
+if(USE_SYSTEM_GRPC_PROTOBUF)
+  # Find system-installed gRPC and Protobuf libraries
+  find_package(gRPC 1.68.0 CONFIG REQUIRED)
+  find_package(protobuf 29.0.0 CONFIG REQUIRED)
+else()
+  find_package(ZLIB REQUIRED)
+
+  # Build gRPC and Protobuf using FetchContent
+  FetchContent_Declare(
+      protobuf
+      GIT_REPOSITORY https://github.com/google/protobuf
+      GIT_TAG        v29.0
+      GIT_PROGRESS   TRUE
+      GIT_SHALLOW    TRUE
+      USES_TERMINAL_DOWNLOAD TRUE
+      GIT_SUBMODULES_RECURSE TRUE
+      GIT_SUBMODULES ""
+  )
+  set(protobuf_BUILD_TESTS OFF)
+  set(protobuf_BUILD_CONFORMANCE OFF)
+  set(protobuf_BUILD_EXAMPLES OFF)
+  set(protobuf_BUILD_LIBPROTOC OFF)
+  set(protobuf_DISABLE_RTTI ON)
+  set(protobuf_MSVC_STATIC_RUNTIME ON)
+  set(protobuf_WITH_ZLIB OFF)
+
+  FetchContent_MakeAvailable(protobuf)
+   # Build gRPC and Protobuf using FetchContent
+  FetchContent_Declare(
+    gRPC
+    GIT_REPOSITORY https://github.com/grpc/grpc
+    GIT_TAG        v1.68.0       
+    GIT_PROGRESS   TRUE
+    GIT_SHALLOW    TRUE
+    USES_TERMINAL_DOWNLOAD TRUE
+    GIT_SUBMODULES_RECURSE TRUE
+    GIT_SUBMODULES
+      "third_party/cares"
+      "third_party/boringssl-with-bazel"
+      "third_party/re2"
+      "third_party/abseil-cpp"  
+  )
+
+  set(gRPC_BUILD_TESTS OFF)
+  set(gRPC_BUILD_CODEGEN OFF) # for grpc_cpp_plugin
+  set(gRPC_BUILD_GRPC_CPP_PLUGIN OFF) # we want to use only C++ plugin
+  set(gRPC_BUILD_CSHARP_EXT OFF)
+  set(gRPC_BUILD_GRPC_CSHARP_PLUGIN OFF)
+  set(gRPC_BUILD_GRPC_NODE_PLUGIN OFF)
+  set(gRPC_BUILD_GRPC_OBJECTIVE_C_PLUGIN OFF)
+  set(gRPC_BUILD_GRPC_PHP_PLUGIN OFF)
+  set(gRPC_BUILD_GRPC_PYTHON_PLUGIN OFF)
+  set(gRPC_BUILD_GRPC_RUBY_PLUGIN OFF)
+
+  set(gRPC_BENCHMARK_PROVIDER "none" CACHE STRING "" FORCE)
+  set(gRPC_PROTOBUF_PROVIDER "package" CACHE STRING "" FORCE)
+  set(gRPC_ZLIB_PROVIDER "package" CACHE STRING "" FORCE)
+
+  # use lite protobuf version, unless we start using features
+  # that require full protobuf
+  set(gRPC_USE_PROTO_LITE ON CACHE BOOL "" FORCE)
+
+  FetchContent_MakeAvailable(gRPC)
+endif()
 
 target_link_libraries(${PROJECT_NAME} PUBLIC gRPC::grpc++ protobuf::libprotobuf)