CMake: Choice third party provider

Now we can use submodules or external packages

1 files changed, 99 insertions, 27 deletions

diff --git a/templates/CMakeLists.txt.template b/templates/CMakeLists.txt.template
index 8624dc4b25..4c8d155b29 100644
--- a/templates/CMakeLists.txt.template
+++ b/templates/CMakeLists.txt.template
@@ -42,14 +42,16 @@
   <%!
   def get_deps(target_dict):
     deps = []
+    if target_dict.get('baselib', False):
+      deps.append("${_gRPC_BASELIB_LIBRARIES}")
     if target_dict.get('build', None) in ['protoc']:
-      deps.append("libprotoc")
+      deps.append("${_gRPC_PROTOBUF_PROTOC_LIBRARIES}")
     if target_dict.get('secure', False):
-      deps = ["ssl"]
+      deps.append("${_gRPC_SSL_LIBRARIES}")
     if target_dict['name'] in ['grpc++', 'grpc++_unsecure', 'grpc++_codegen_lib']:
-      deps.append("${PROTOBUF_LIBRARY_NAME}")
+      deps.append("${_gRPC_PROTOBUF_LIBRARIES}")
     elif target_dict['name'] in ['grpc']:
-      deps.append("zlibstatic")
+      deps.append("${_gRPC_ZLIB_LIBRARIES}")
     for d in target_dict.get('deps', []):
       deps.append(d)
     return deps
@@ -64,35 +66,105 @@
   set(PACKAGE_BUGREPORT "https://github.com/grpc/grpc/issues/")
   project(<%text>${PACKAGE_NAME}</%text> C CXX)
 
-  if(NOT BORINGSSL_ROOT_DIR)
-    set(BORINGSSL_ROOT_DIR <%text>${CMAKE_CURRENT_SOURCE_DIR}</%text>/third_party/boringssl)
-  endif()
-  if(NOT PROTOBUF_ROOT_DIR)
-    set(PROTOBUF_ROOT_DIR <%text>${CMAKE_CURRENT_SOURCE_DIR}</%text>/third_party/protobuf)
+  set(gRPC_ZLIB_PROVIDER "module" CACHE STRING "Provider of zlib library")
+  set_property(CACHE gRPC_ZLIB_PROVIDER PROPERTY STRINGS "module" "package")
+
+  set(gRPC_SSL_PROVIDER "module" CACHE STRING "Provider of ssl library")
+  set_property(CACHE gRPC_SSL_PROVIDER PROPERTY STRINGS "module" "package")
+
+  set(gRPC_PROTOBUF_PROVIDER "module" CACHE STRING "Provider of protobuf library")
+  set_property(CACHE gRPC_PROTOBUF_PROVIDER PROPERTY STRINGS "module" "package")
+
+  set(gRPC_USE_PROTO_LITE OFF CACHE BOOL "Use the protobuf-lite library")
+
+  if (gRPC_USE_PROTO_LITE)
+    set(_gRPC_PROTOBUF_LIBRARY_NAME "libprotobuf-lite")
+    add_definitions("-DGRPC_USE_PROTO_LITE")
+  else()
+    set(_gRPC_PROTOBUF_LIBRARY_NAME "libprotobuf")
   endif()
-  if(NOT ZLIB_ROOT_DIR)
-    set(ZLIB_ROOT_DIR <%text>${CMAKE_CURRENT_SOURCE_DIR}</%text>/third_party/zlib)
+
+  if("<%text>${gRPC_ZLIB_PROVIDER}</%text>" STREQUAL "module")
+    if(NOT ZLIB_ROOT_DIR)
+      set(ZLIB_ROOT_DIR <%text>${CMAKE_CURRENT_SOURCE_DIR}</%text>/third_party/zlib)
+    endif()
+    set(ZLIB_INCLUDE_DIR "<%text>${ZLIB_ROOT_DIR}</%text>")
+    if(EXISTS "<%text>${ZLIB_ROOT_DIR}</%text>/CMakeLists.txt")
+        add_subdirectory(<%text>${ZLIB_ROOT_DIR}</%text> third_party/zlib)
+        if(TARGET zlibstatic)
+            set(_gRPC_ZLIB_LIBRARIES zlibstatic)
+        endif()
+    else()
+        message(WARNING "gRPC_ZLIB_PROVIDER is \"module\" but ZLIB_ROOT_DIR is wrong")
+    endif()
+  elseif("<%text>${gRPC_ZLIB_PROVIDER}</%text>" STREQUAL "package")
+    find_package(ZLIB)
+    if(TARGET ZLIB::ZLIB)
+      set(_gRPC_ZLIB_LIBRARIES ZLIB::ZLIB)
+    endif()
   endif()
 
-  # Building the protobuf tests require gmock what is not part of a standard protobuf checkout.
-  # Disable them unless they are explicitly requested from the cmake command line (when we assume
-  # gmock is downloaded to the right location inside protobuf).
-  if(NOT protobuf_BUILD_TESTS)
-    set(protobuf_BUILD_TESTS OFF CACHE BOOL "Build protobuf tests")
+  if("<%text>${gRPC_PROTOBUF_PROVIDER}</%text>" STREQUAL "module")
+    # Building the protobuf tests require gmock what is not part of a standard protobuf checkout.
+    # Disable them unless they are explicitly requested from the cmake command line (when we assume
+    # gmock is downloaded to the right location inside protobuf).
+    if(NOT protobuf_BUILD_TESTS)
+      set(protobuf_BUILD_TESTS OFF CACHE BOOL "Build protobuf tests")
+    endif()
+    if(NOT PROTOBUF_ROOT_DIR)
+      set(PROTOBUF_ROOT_DIR <%text>${CMAKE_CURRENT_SOURCE_DIR}</%text>/third_party/protobuf)
+    endif()
+    if(EXISTS "<%text>${PROTOBUF_ROOT_DIR}</%text>/cmake/CMakeLists.txt")
+      add_subdirectory(<%text>${PROTOBUF_ROOT_DIR}</%text>/cmake third_party/protobuf)
+      if(TARGET <%text>${_gRPC_PROTOBUF_LIBRARY_NAME}</%text>)
+        set(_gRPC_PROTOBUF_LIBRARIES <%text>${_gRPC_PROTOBUF_LIBRARY_NAME}</%text>)
+      endif()
+      if(TARGET libprotoc)
+        set(_gRPC_PROTOBUF_PROTOC_LIBRARIES libprotoc)
+      endif()
+    else()
+        message(WARNING "gRPC_PROTOBUF_PROVIDER is \"module\" but PROTOBUF_ROOT_DIR is wrong")
+    endif()
+  elseif("<%text>${gRPC_PROTOBUF_PROVIDER}</%text>" STREQUAL "package")
+    find_package(protobuf CONFIG)
+    if(protobuf_FOUND)
+      if(TARGET protobuf::<%text>${_gRPC_PROTOBUF_LIBRARY_NAME}</%text>)
+        set(_gRPC_PROTOBUF_LIBRARIES protobuf::<%text>${_gRPC_PROTOBUF_LIBRARY_NAME}</%text>)
+      endif()
+      if(TARGET protobuf::libprotoc)
+        set(_gRPC_PROTOBUF_PROTOC_LIBRARIES protobuf::libprotoc)
+      endif()
+    else()
+      find_package(Protobuf MODULE)
+    endif()
   endif()
 
-  add_subdirectory(<%text>${BORINGSSL_ROOT_DIR}</%text> third_party/boringssl)
-  add_subdirectory(<%text>${PROTOBUF_ROOT_DIR}</%text>/cmake third_party/protobuf)
-  add_subdirectory(<%text>${ZLIB_ROOT_DIR}</%text> third_party/zlib)
+  if("<%text>${gRPC_SSL_PROVIDER}</%text>" STREQUAL "module")
+    if(NOT BORINGSSL_ROOT_DIR)
+      set(BORINGSSL_ROOT_DIR <%text>${CMAKE_CURRENT_SOURCE_DIR}</%text>/third_party/boringssl)
+    endif()
+    if(EXISTS "<%text>${BORINGSSL_ROOT_DIR}</%text>/CMakeLists.txt")
+      add_subdirectory(<%text>${BORINGSSL_ROOT_DIR}</%text> third_party/boringssl)
+      if(TARGET ssl)
+        set(_gRPC_SSL_LIBRARIES ssl)
+      endif()
+    else()
+        message(WARNING "gRPC_SSL_PROVIDER is \"module\" but BORINGSSL_ROOT_DIR is wrong")
+    endif()
+  elseif("<%text>${gRPC_SSL_PROVIDER}</%text>" STREQUAL "package")
+    find_package(OpenSSL)
+    if(TARGET OpenSSL::SSL)
+      set(_gRPC_SSL_LIBRARIES OpenSSL::SSL)
+    endif()
+  endif()
 
-  set(CMAKE_C_FLAGS   "<%text>${CMAKE_C_FLAGS}</%text>   -std=c11")
-  set(CMAKE_CXX_FLAGS "<%text>${CMAKE_CXX_FLAGS}</%text> -std=c++11")
+  if(NOT MSVC)
+    set(CMAKE_C_FLAGS   "<%text>${CMAKE_C_FLAGS}</%text>   -std=c11")
+    set(CMAKE_CXX_FLAGS "<%text>${CMAKE_CXX_FLAGS}</%text> -std=c++11")
+  endif()
 
-  if (GRPC_USE_PROTO_LITE)
-    set(PROTOBUF_LIBRARY_NAME "libprotobuf-lite")
-    add_definitions("-DGRPC_USE_PROTO_LITE")
-  else()
-    set(PROTOBUF_LIBRARY_NAME "libprotobuf")
+  if(WIN32 AND MSVC)
+    set(_gRPC_BASELIB_LIBRARIES wsock32 ws2_32)
   endif()
 
   % for lib in libs:
@@ -119,7 +191,7 @@
     PRIVATE <%text>${CMAKE_CURRENT_SOURCE_DIR}</%text>/include
     PRIVATE <%text>${BORINGSSL_ROOT_DIR}</%text>/include
     PRIVATE <%text>${PROTOBUF_ROOT_DIR}</%text>/src
-    PRIVATE <%text>${ZLIB_ROOT_DIR}</%text>
+    PRIVATE <%text>${ZLIB_INCLUDE_DIR}</%text>
     PRIVATE <%text>${CMAKE_CURRENT_BINARY_DIR}</%text>/third_party/zlib
   )