cmake_modules/FindProtobuf.cmake - kudu - Git at Google

 #########
 # Local rewrite of the protobuf support in cmake.
 #
 # Supports cross-module protobuf dependencies and protobufs inside
 # packages much better than the one built into cmake.
 #########
 #
 # Locate and configure the Google Protocol Buffers library.
 # Defines the following variables:
 #
 #   PROTOBUF_FOUND - Found the Google Protocol Buffers library
 #   PROTOBUF_INCLUDE_DIRS - Include directories for Google Protocol Buffers
 #   PROTOBUF_LIBRARIES - The protobuf library
 #
 # The following cache variables are also defined:
 #   PROTOBUF_LIBRARY - The protobuf library
 #   PROTOBUF_STATIC_LIBRARY - The protobuf library (static link)
 #   PROTOBUF_PROTOC_LIBRARY   - The protoc library
 #   PROTOBUF_INCLUDE_DIR - The include directory for protocol buffers
 #   PROTOBUF_PROTOC_EXECUTABLE - The protoc compiler
 #
 #  ====================================================================
 #  Example:
 #
 #   find_package(Protobuf REQUIRED)
 #   include_directories(${PROTOBUF_INCLUDE_DIRS})
 #
 #   include_directories(${CMAKE_CURRENT_BINARY_DIR})
 #   PROTOBUF_GENERATE_CPP(PROTO_SRCS PROTO_HDRS PROTO_TGTS
 #     [SOURCE_ROOT <root from which source is found>]
 #     [BINARY_ROOT <root into which binaries are built>]
 #     PROTO_FILES foo.proto)
 #   add_executable(bar bar.cc ${PROTO_SRCS} ${PROTO_HDRS})
 #   target_link_libraries(bar ${PROTOBUF_LIBRARY})
 #
 # NOTE: You may need to link against pthreads, depending
 # on the platform.
 #  ====================================================================
 #
 # PROTOBUF_GENERATE_CPP (public function)
 #   SRCS = Variable to define with autogenerated
 #          source files
 #   HDRS = Variable to define with autogenerated
 #          header files
 #   TGTS = Variable to define with autogenerated
 #          custom targets; if SRCS/HDRS need to be used in multiple
 #          libraries, those libraries should depend on these targets
 #          in order to "serialize" the protoc invocations
 #  ====================================================================


 #=============================================================================
 # Copyright 2011 Kirill A. Korinskiy <catap@catap.ru>
 # Copyright 2009 Kitware, Inc.
 # Copyright 2009 Philip Lowman <philip@yhbt.com>
 # Copyright 2008 Esben Mose Hansen, Ange Optimization ApS
 #
 # Distributed under the OSI-approved BSD License (the "License");
 # see accompanying file Copyright.txt for details.
 #
 # This software is distributed WITHOUT ANY WARRANTY; without even the
 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 # See the License for more information.
 #=============================================================================
 # (To distributed this file outside of CMake, substitute the full
 #  License text for the above reference.)

 function(PROTOBUF_GENERATE_CPP SRCS HDRS TGTS)
   if(NOT ARGN)
     message(SEND_ERROR "Error: PROTOBUF_GENERATE_CPP() called without any proto files")
     return()
   endif(NOT ARGN)

   set(options)
   set(one_value_args SOURCE_ROOT BINARY_ROOT)
   set(multi_value_args EXTRA_PROTO_PATHS PROTO_FILES)
   cmake_parse_arguments(ARG "${options}" "${one_value_args}" "${multi_value_args}" ${ARGN})
   if(ARG_UNPARSED_ARGUMENTS)
     message(SEND_ERROR "Error: unrecognized arguments: ${ARG_UNPARSED_ARGUMENTS}")
   endif()

   set(${SRCS})
   set(${HDRS})
   set(${TGTS})

   set(EXTRA_PROTO_PATH_ARGS)
   foreach(PP ${ARG_EXTRA_PROTO_PATHS})
     set(EXTRA_PROTO_PATH_ARGS ${EXTRA_PROTO_PATH_ARGS} --proto_path ${PP})
   endforeach()

   if("${ARG_SOURCE_ROOT}" STREQUAL "")
     SET(ARG_SOURCE_ROOT "${CMAKE_CURRENT_SOURCE_DIR}")
   endif()
   GET_FILENAME_COMPONENT(ARG_SOURCE_ROOT ${ARG_SOURCE_ROOT} ABSOLUTE)

   if("${ARG_BINARY_ROOT}" STREQUAL "")
     SET(ARG_BINARY_ROOT "${CMAKE_CURRENT_BINARY_DIR}")
   endif()
   GET_FILENAME_COMPONENT(ARG_BINARY_ROOT ${ARG_BINARY_ROOT} ABSOLUTE)

   foreach(FIL ${ARG_PROTO_FILES})
     get_filename_component(ABS_FIL ${FIL} ABSOLUTE)
     get_filename_component(FIL_WE ${FIL} NAME_WE)

     # Ensure that the protobuf file is within the source root.
     # This is a requirement of protoc.
     FILE(RELATIVE_PATH PROTO_REL_TO_ROOT "${ARG_SOURCE_ROOT}" "${ABS_FIL}")

     GET_FILENAME_COMPONENT(REL_DIR "${PROTO_REL_TO_ROOT}" PATH)

     if(NOT REL_DIR STREQUAL "")
       SET(REL_DIR "${REL_DIR}/")
     endif()

     set(PROTO_CC_OUT "${ARG_BINARY_ROOT}/${REL_DIR}${FIL_WE}.pb.cc")
     set(PROTO_H_OUT "${ARG_BINARY_ROOT}/${REL_DIR}${FIL_WE}.pb.h")
     list(APPEND ${SRCS} "${PROTO_CC_OUT}")
     list(APPEND ${HDRS} "${PROTO_H_OUT}")

     if(NOT EXISTS ${PROTO_DST_ROOT}/${FIL_PT})
         file(MAKE_DIRECTORY ${PROTO_DST_ROOT}/${FIL_PT})
     endif()

     add_custom_command(
       OUTPUT "${PROTO_CC_OUT}" "${PROTO_H_OUT}"
       COMMAND  ${PROTOBUF_PROTOC_EXECUTABLE}
       ARGS
         --plugin $<TARGET_FILE:protoc-gen-insertions>
         --cpp_out ${ARG_BINARY_ROOT}
         --insertions_out ${ARG_BINARY_ROOT}
         --proto_path ${ARG_SOURCE_ROOT}
         # Used to find built-in .proto files (e.g. FileDescriptorProto)
         --proto_path ${PROTOBUF_INCLUDE_DIR}
         ${EXTRA_PROTO_PATH_ARGS} ${ABS_FIL}
       DEPENDS ${ABS_FIL} protoc-gen-insertions
       COMMENT "Running C++ protocol buffer compiler on ${FIL}"
       VERBATIM )

     # This custom target enforces that there's just one invocation of protoc
     # when there are multiple consumers of the generated files. The target name
     # must be unique; adding parts of the filename helps ensure this.
     set(TGT_NAME ${REL_DIR}${FIL})
     string(REPLACE "/" "-" TGT_NAME ${TGT_NAME})
     add_custom_target(${TGT_NAME}
       DEPENDS "${PROTO_CC_OUT}" "${PROTO_H_OUT}")
     list(APPEND ${TGTS} "${TGT_NAME}")
   endforeach()

   set_source_files_properties(${${SRCS}} ${${HDRS}} PROPERTIES GENERATED TRUE)
   set(${SRCS} ${${SRCS}} PARENT_SCOPE)
   set(${HDRS} ${${HDRS}} PARENT_SCOPE)
   set(${TGTS} ${${TGTS}} PARENT_SCOPE)
 endfunction()


 find_path(PROTOBUF_INCLUDE_DIR google/protobuf/service.h
   ${THIRDPARTY_PREFIX}/include
   NO_DEFAULT_PATH
 )

 # Google's provided vcproj files generate libraries with a "lib"
 # prefix on Windows
 if(WIN32)
     set(PROTOBUF_ORIG_FIND_LIBRARY_PREFIXES "${CMAKE_FIND_LIBRARY_PREFIXES}")
     set(CMAKE_FIND_LIBRARY_PREFIXES "lib" "")
 endif()

 find_library(PROTOBUF_LIBRARY NAMES libprotobuf${CMAKE_SHARED_LIBRARY_SUFFIX}
              DOC "The Google Protocol Buffers Library"
              PATHS ${THIRDPARTY_PREFIX}/lib
              NO_DEFAULT_PATH
 )
 find_file(PROTOBUF_STATIC_LIBRARY libprotobuf.a
          DOC "Static version of the Google Protocol Buffers Library"
          PATHS ${THIRDPARTY_PREFIX}/lib
          NO_DEFAULT_PATH)

 find_library(PROTOBUF_PROTOC_LIBRARY NAMES libprotoc${CMAKE_SHARED_LIBRARY_SUFFIX}
              DOC "The Google Protocol Buffers Compiler Library"
              PATHS ${THIRDPARTY_PREFIX}/lib
              NO_DEFAULT_PATH
 )
 find_library(PROTOBUF_PROTOC_STATIC_LIBRARY NAMES libprotoc.a
          DOC "Static version of the Google Protocol Buffers Compiler Library"
          PATHS ${THIRDPARTY_PREFIX}/lib
          NO_DEFAULT_PATH)

 find_program(PROTOBUF_PROTOC_EXECUTABLE NAMES protoc
              DOC "The Google Protocol Buffers Compiler"
              PATHS ${THIRDPARTY_PREFIX}/bin
              NO_DEFAULT_PATH
 )

 mark_as_advanced(PROTOBUF_INCLUDE_DIR
                  PROTOBUF_LIBRARY
                  PROTOBUF_STATIC_LIBRARY
                  PROTOBUF_PROTOC_LIBRARY
                  PROTOBUF_PROTOC_STATIC_LIBRARY
                  PROTOBUF_PROTOC_EXECUTABLE)

 # Restore original find library prefixes
 if(WIN32)
     set(CMAKE_FIND_LIBRARY_PREFIXES "${PROTOBUF_ORIG_FIND_LIBRARY_PREFIXES}")
 endif()

 include(FindPackageHandleStandardArgs)
 FIND_PACKAGE_HANDLE_STANDARD_ARGS(PROTOBUF DEFAULT_MSG
     PROTOBUF_LIBRARY PROTOBUF_INCLUDE_DIR)

 if(PROTOBUF_FOUND)
     set(PROTOBUF_INCLUDE_DIRS ${PROTOBUF_INCLUDE_DIR})
     set(PROTOBUF_LIBRARIES    ${PROTOBUF_LIBRARY})
 endif()
	#########
	# Local rewrite of the protobuf support in cmake.
	#
	# Supports cross-module protobuf dependencies and protobufs inside
	# packages much better than the one built into cmake.
	#########
	#
	# Locate and configure the Google Protocol Buffers library.
	# Defines the following variables:
	#
	# PROTOBUF_FOUND - Found the Google Protocol Buffers library
	# PROTOBUF_INCLUDE_DIRS - Include directories for Google Protocol Buffers
	# PROTOBUF_LIBRARIES - The protobuf library
	#
	# The following cache variables are also defined:
	# PROTOBUF_LIBRARY - The protobuf library
	# PROTOBUF_STATIC_LIBRARY - The protobuf library (static link)
	# PROTOBUF_PROTOC_LIBRARY - The protoc library
	# PROTOBUF_INCLUDE_DIR - The include directory for protocol buffers
	# PROTOBUF_PROTOC_EXECUTABLE - The protoc compiler
	#
	# ====================================================================
	# Example:
	#
	# find_package(Protobuf REQUIRED)
	# include_directories(${PROTOBUF_INCLUDE_DIRS})
	#
	# include_directories(${CMAKE_CURRENT_BINARY_DIR})
	# PROTOBUF_GENERATE_CPP(PROTO_SRCS PROTO_HDRS PROTO_TGTS
	# [SOURCE_ROOT <root from which source is found>]
	# [BINARY_ROOT <root into which binaries are built>]
	# PROTO_FILES foo.proto)
	# add_executable(bar bar.cc ${PROTO_SRCS} ${PROTO_HDRS})
	# target_link_libraries(bar ${PROTOBUF_LIBRARY})
	#
	# NOTE: You may need to link against pthreads, depending
	# on the platform.
	# ====================================================================
	#
	# PROTOBUF_GENERATE_CPP (public function)
	# SRCS = Variable to define with autogenerated
	# source files
	# HDRS = Variable to define with autogenerated
	# header files
	# TGTS = Variable to define with autogenerated
	# custom targets; if SRCS/HDRS need to be used in multiple
	# libraries, those libraries should depend on these targets
	# in order to "serialize" the protoc invocations
	# ====================================================================


	#=============================================================================
	# Copyright 2011 Kirill A. Korinskiy <catap@catap.ru>
	# Copyright 2009 Kitware, Inc.
	# Copyright 2009 Philip Lowman <philip@yhbt.com>
	# Copyright 2008 Esben Mose Hansen, Ange Optimization ApS
	#
	# Distributed under the OSI-approved BSD License (the "License");
	# see accompanying file Copyright.txt for details.
	#
	# This software is distributed WITHOUT ANY WARRANTY; without even the
	# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
	# See the License for more information.
	#=============================================================================
	# (To distributed this file outside of CMake, substitute the full
	# License text for the above reference.)

	function(PROTOBUF_GENERATE_CPP SRCS HDRS TGTS)
	if(NOT ARGN)
	message(SEND_ERROR "Error: PROTOBUF_GENERATE_CPP() called without any proto files")
	return()
	endif(NOT ARGN)

	set(options)
	set(one_value_args SOURCE_ROOT BINARY_ROOT)
	set(multi_value_args EXTRA_PROTO_PATHS PROTO_FILES)
	cmake_parse_arguments(ARG "${options}" "${one_value_args}" "${multi_value_args}" ${ARGN})
	if(ARG_UNPARSED_ARGUMENTS)
	message(SEND_ERROR "Error: unrecognized arguments: ${ARG_UNPARSED_ARGUMENTS}")
	endif()

	set(${SRCS})
	set(${HDRS})
	set(${TGTS})

	set(EXTRA_PROTO_PATH_ARGS)
	foreach(PP ${ARG_EXTRA_PROTO_PATHS})
	set(EXTRA_PROTO_PATH_ARGS ${EXTRA_PROTO_PATH_ARGS} --proto_path ${PP})
	endforeach()

	if("${ARG_SOURCE_ROOT}" STREQUAL "")
	SET(ARG_SOURCE_ROOT "${CMAKE_CURRENT_SOURCE_DIR}")
	endif()
	GET_FILENAME_COMPONENT(ARG_SOURCE_ROOT ${ARG_SOURCE_ROOT} ABSOLUTE)

	if("${ARG_BINARY_ROOT}" STREQUAL "")
	SET(ARG_BINARY_ROOT "${CMAKE_CURRENT_BINARY_DIR}")
	endif()
	GET_FILENAME_COMPONENT(ARG_BINARY_ROOT ${ARG_BINARY_ROOT} ABSOLUTE)

	foreach(FIL ${ARG_PROTO_FILES})
	get_filename_component(ABS_FIL ${FIL} ABSOLUTE)
	get_filename_component(FIL_WE ${FIL} NAME_WE)

	# Ensure that the protobuf file is within the source root.
	# This is a requirement of protoc.
	FILE(RELATIVE_PATH PROTO_REL_TO_ROOT "${ARG_SOURCE_ROOT}" "${ABS_FIL}")

	GET_FILENAME_COMPONENT(REL_DIR "${PROTO_REL_TO_ROOT}" PATH)

	if(NOT REL_DIR STREQUAL "")
	SET(REL_DIR "${REL_DIR}/")
	endif()

	set(PROTO_CC_OUT "${ARG_BINARY_ROOT}/${REL_DIR}${FIL_WE}.pb.cc")
	set(PROTO_H_OUT "${ARG_BINARY_ROOT}/${REL_DIR}${FIL_WE}.pb.h")
	list(APPEND ${SRCS} "${PROTO_CC_OUT}")
	list(APPEND ${HDRS} "${PROTO_H_OUT}")

	if(NOT EXISTS ${PROTO_DST_ROOT}/${FIL_PT})
	file(MAKE_DIRECTORY ${PROTO_DST_ROOT}/${FIL_PT})
	endif()

	add_custom_command(
	OUTPUT "${PROTO_CC_OUT}" "${PROTO_H_OUT}"
	COMMAND ${PROTOBUF_PROTOC_EXECUTABLE}
	ARGS
	--plugin $<TARGET_FILE:protoc-gen-insertions>
	--cpp_out ${ARG_BINARY_ROOT}
	--insertions_out ${ARG_BINARY_ROOT}
	--proto_path ${ARG_SOURCE_ROOT}
	# Used to find built-in .proto files (e.g. FileDescriptorProto)
	--proto_path ${PROTOBUF_INCLUDE_DIR}
	${EXTRA_PROTO_PATH_ARGS} ${ABS_FIL}
	DEPENDS ${ABS_FIL} protoc-gen-insertions
	COMMENT "Running C++ protocol buffer compiler on ${FIL}"
	VERBATIM )

	# This custom target enforces that there's just one invocation of protoc
	# when there are multiple consumers of the generated files. The target name
	# must be unique; adding parts of the filename helps ensure this.
	set(TGT_NAME ${REL_DIR}${FIL})
	string(REPLACE "/" "-" TGT_NAME ${TGT_NAME})
	add_custom_target(${TGT_NAME}
	DEPENDS "${PROTO_CC_OUT}" "${PROTO_H_OUT}")
	list(APPEND ${TGTS} "${TGT_NAME}")
	endforeach()

	set_source_files_properties(${${SRCS}} ${${HDRS}} PROPERTIES GENERATED TRUE)
	set(${SRCS} ${${SRCS}} PARENT_SCOPE)
	set(${HDRS} ${${HDRS}} PARENT_SCOPE)
	set(${TGTS} ${${TGTS}} PARENT_SCOPE)
	endfunction()


	find_path(PROTOBUF_INCLUDE_DIR google/protobuf/service.h
	${THIRDPARTY_PREFIX}/include
	NO_DEFAULT_PATH
	)

	# Google's provided vcproj files generate libraries with a "lib"
	# prefix on Windows
	if(WIN32)
	set(PROTOBUF_ORIG_FIND_LIBRARY_PREFIXES "${CMAKE_FIND_LIBRARY_PREFIXES}")
	set(CMAKE_FIND_LIBRARY_PREFIXES "lib" "")
	endif()

	find_library(PROTOBUF_LIBRARY NAMES libprotobuf${CMAKE_SHARED_LIBRARY_SUFFIX}
	DOC "The Google Protocol Buffers Library"
	PATHS ${THIRDPARTY_PREFIX}/lib
	NO_DEFAULT_PATH
	)
	find_file(PROTOBUF_STATIC_LIBRARY libprotobuf.a
	DOC "Static version of the Google Protocol Buffers Library"
	PATHS ${THIRDPARTY_PREFIX}/lib
	NO_DEFAULT_PATH)

	find_library(PROTOBUF_PROTOC_LIBRARY NAMES libprotoc${CMAKE_SHARED_LIBRARY_SUFFIX}
	DOC "The Google Protocol Buffers Compiler Library"
	PATHS ${THIRDPARTY_PREFIX}/lib
	NO_DEFAULT_PATH
	)
	find_library(PROTOBUF_PROTOC_STATIC_LIBRARY NAMES libprotoc.a
	DOC "Static version of the Google Protocol Buffers Compiler Library"
	PATHS ${THIRDPARTY_PREFIX}/lib
	NO_DEFAULT_PATH)

	find_program(PROTOBUF_PROTOC_EXECUTABLE NAMES protoc
	DOC "The Google Protocol Buffers Compiler"
	PATHS ${THIRDPARTY_PREFIX}/bin
	NO_DEFAULT_PATH
	)

	mark_as_advanced(PROTOBUF_INCLUDE_DIR
	PROTOBUF_LIBRARY
	PROTOBUF_STATIC_LIBRARY
	PROTOBUF_PROTOC_LIBRARY
	PROTOBUF_PROTOC_STATIC_LIBRARY
	PROTOBUF_PROTOC_EXECUTABLE)

	# Restore original find library prefixes
	if(WIN32)
	set(CMAKE_FIND_LIBRARY_PREFIXES "${PROTOBUF_ORIG_FIND_LIBRARY_PREFIXES}")
	endif()

	include(FindPackageHandleStandardArgs)
	FIND_PACKAGE_HANDLE_STANDARD_ARGS(PROTOBUF DEFAULT_MSG
	PROTOBUF_LIBRARY PROTOBUF_INCLUDE_DIR)

	if(PROTOBUF_FOUND)
	set(PROTOBUF_INCLUDE_DIRS ${PROTOBUF_INCLUDE_DIR})
	set(PROTOBUF_LIBRARIES ${PROTOBUF_LIBRARY})
	endif()