Move gRPC build configuration to FindGrpc.cmake

cpp/cmake_modules/FindGrpc.cmake

@@ -0,0 +1,96 @@
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# PROTOBUF_HOME environmental variable is used to check for Protobuf headers and static library
+
+# PROTOBUF_INCLUDE_DIR: directory containing headers
+# PROTOBUF_LIBS: directory containing Protobuf libraries
+# PROTOBUF_STATIC_LIB: location of protobuf.a
+# PROTOC_STATIC_LIB: location of protoc.a
+# PROTOBUF_EXECUTABLE: location of protoc
+# PROTOBUF_FOUND is set if Protobuf is found
+
+
+if( NOT "${GRPC_HOME}" STREQUAL "")
+    file (TO_CMAKE_PATH "${GRPC_HOME}" _grpc_path)
+endif()
+
+message (STATUS "GRPC_HOME: ${GRPC_HOME}")
+
+find_path (GRPC_INCLUDE_DIR grpc/grpc.h HINTS
+  ${_grpc_path}
+  NO_DEFAULT_PATH
+  PATH_SUFFIXES "include")
+
+set (lib_dirs "lib")
+if (EXISTS "${_grpc_path}/lib64")
+  set (lib_dirs "lib64" ${lib_dirs})
+endif ()
+if (EXISTS "${_grpc_path}/lib/${CMAKE_LIBRARY_ARCHITECTURE}")
+  set (lib_dirs "lib/${CMAKE_LIBRARY_ARCHITECTURE}" ${lib_dirs})
+endif ()
+
+find_library (GPR_STATIC_LIB
+  NAMES "${CMAKE_STATIC_LIBRARY_PREFIX}gpr${CMAKE_STATIC_LIBRARY_SUFFIX}"
+  PATHS ${_grpc_path}
+  NO_DEFAULT_PATH
+  PATH_SUFFIXES ${lib_dirs})
+
+find_library (GRPC_ADDRESS_SORTING_STATIC_LIB
+  NAMES "${CMAKE_STATIC_LIBRARY_PREFIX}address_sorting${CMAKE_STATIC_LIBRARY_SUFFIX}"
+  PATHS ${_grpc_path}
+  NO_DEFAULT_PATH
+  PATH_SUFFIXES ${lib_dirs})
+
+find_library (GRPC_STATIC_LIB
+  NAMES "${CMAKE_STATIC_LIBRARY_PREFIX}grpc${CMAKE_STATIC_LIBRARY_SUFFIX}"
+  PATHS ${_grpc_path}
+  NO_DEFAULT_PATH
+  PATH_SUFFIXES ${lib_dirs})
+
+find_library (GRPCPP_STATIC_LIB
+  NAMES "${CMAKE_STATIC_LIBRARY_PREFIX}grpc++${CMAKE_STATIC_LIBRARY_SUFFIX}"
+  PATHS ${_grpc_path}
+  NO_DEFAULT_PATH
+  PATH_SUFFIXES ${lib_dirs})
+
+find_program(GRPC_CPP_PLUGIN grpc_cpp_plugin protoc-gen-grpc-cpp
+  HINTS ${_grpc_path}
+  NO_DEFAULT_PATH
+  PATH_SUFFIXES "bin")
+
+if (GRPC_INCLUDE_DIR AND GPR_STATIC_LIB AND GRPC_ADDRESS_SORTING_STATIC_LIB AND
+    GRPC_STATIC_LIB AND GRPCPP_STATIC_LIB AND GRPC_CPP_PLUGIN)
+  set (gRPC_FOUND TRUE)
+else ()
+  set (gRPC_FOUND FALSE)
+endif ()
+
+if (gRPC_FOUND)
+  message (STATUS "Found the gRPC headers: ${GRPC_INCLUDE_DIR}")
+else()
+  if (_grpc_path)
+    set (GRPC_ERR_MSG "Could not find gRPC. Looked in ${_grpc_path}.")
+  else ()
+    set (GRPC_ERR_MSG "Could not find gRPC in system search paths.")
+  endif()
+
+  if (gRPC_FIND_REQUIRED)
+    message (FATAL_ERROR "${GRPC_ERR_MSG}")
+  else ()
+    message (STATUS "${GRPC_ERR_MSG}")
+  endif ()
+endif()
+
+mark_as_advanced (
+  GRPC_INCLUDE_DIR
+)

cpp/cmake_modules/ThirdpartyToolchain.cmake

@@ -1244,12 +1244,7 @@ if (ARROW_FLIGHT)
       CMAKE_ARGS ${GRPC_CMAKE_ARGS}
       ${EP_LOG_OPTIONS})
     include_directories(SYSTEM ${GRPC_INCLUDE_DIR})
-  else()
-    find_package(gRPC CONFIG)
-    set(GRPC_VENDORED 0)
-  endif()
 
-  if (GRPC_VENDORED OR gRPC_FOUND)
     get_property(GPR_STATIC_LIB TARGET gRPC::gpr PROPERTY LOCATION)
     get_property(GRPC_STATIC_LIB TARGET gRPC::grpc_unsecure PROPERTY LOCATION)
     get_property(GRPCPP_STATIC_LIB TARGET gRPC::grpc++_unsecure PROPERTY LOCATION)
@@ -1260,15 +1255,8 @@ if (ARROW_FLIGHT)
     # Get location of grpc_cpp_plugin so we can pass it to protoc
     get_property(GRPC_CPP_PLUGIN TARGET gRPC::grpc_cpp_plugin PROPERTY LOCATION)
   else()
-    # This is a non-CMake installation of gRPC
-    set(GPR_STATIC_LIB "${GRPC_HOME}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}gpr${CMAKE_STATIC_LIBRARY_SUFFIX}")
-    set(GRPC_STATIC_LIB "${GRPC_HOME}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}grpc${CMAKE_STATIC_LIBRARY_SUFFIX}")
-    set(GRPCPP_STATIC_LIB "${GRPC_HOME}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}grpc++${CMAKE_STATIC_LIBRARY_SUFFIX}")
-    set(GRPC_ADDRESS_SORTING_STATIC_LIB "${GRPC_HOME}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}address_sorting${CMAKE_STATIC_LIBRARY_SUFFIX}")
-
-    if ("${GRPC_CPP_PLUGIN}" STREQUAL "")
-      message(SEND_ERROR "Please set GRPC_CPP_PLUGIN.")
-    endif()
+    find_package(gRPC REQUIRED)
+    set(GRPC_VENDORED 0)
 
     # If gRPC is built with CMake, it installs its own c-ares, so use
     # that; otherwise, see if the user provided a c-ares installation
@@ -1277,6 +1265,10 @@ if (ARROW_FLIGHT)
     endif()
   endif()
 
+  if ("${GRPC_CPP_PLUGIN}" STREQUAL "")
+    message(SEND_ERROR "Please set GRPC_CPP_PLUGIN.")
+  endif()
+
   ADD_THIRDPARTY_LIB(grpc_gpr
     STATIC_LIB ${GPR_STATIC_LIB})