1# This is an example script for use with CMake projects for locating and configuring
2# the nanopb library.
3#
4# The following varialbes have to be set:
5#
6#   NANOPB_SRC_ROOT_FOLDER  - Path to nanopb source folder
7#
8# The following variables can be set and are optional:
9#
10#
11#   PROTOBUF_SRC_ROOT_FOLDER - When compiling with MSVC, if this cache variable is set
12#                              the protobuf-default VS project build locations
13#                              (vsprojects/Debug & vsprojects/Release) will be searched
14#                              for libraries and binaries.
15#
16#   NANOPB_IMPORT_DIRS       - List of additional directories to be searched for
17#                              imported .proto files.
18#
19#   NANOPB_GENERATE_CPP_APPEND_PATH - By default -I will be passed to protoc
20#                                     for each directory where a proto file is referenced.
21#                                     Set to FALSE if you want to disable this behaviour.
22#
23# Defines the following variables:
24#
25#   NANOPB_FOUND - Found the nanopb library (source&header files, generator tool, protoc compiler tool)
26#   NANOPB_INCLUDE_DIRS - Include directories for Google Protocol Buffers
27#
28# The following cache variables are also available to set or use:
29#   NANOPB_GENERATOR_EXECUTABLE - The nanopb generator
30#   PROTOBUF_PROTOC_EXECUTABLE - The protoc compiler
31#
32#  ====================================================================
33#
34# NANOPB_GENERATE_CPP (public function)
35#   SRCS = Variable to define with autogenerated
36#          source files
37#   HDRS = Variable to define with autogenerated
38#          header files
39#   ARGN = proto files
40#
41#  ====================================================================
42#  Example:
43#
44#   set(NANOPB_SRC_ROOT_FOLDER "/path/to/nanopb")
45#   set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${NANOPB_SRC_ROOT_FOLDER}/cmake)
46#   find_package( Nanopb REQUIRED )
47#   include_directories(${NANOPB_INCLUDE_DIRS})
48#
49#   NANOPB_GENERATE_CPP(PROTO_SRCS PROTO_HDRS foo.proto)
50#
51#   include_directories(${CMAKE_CURRENT_BINARY_DIR})
52#   add_executable(bar bar.cc ${PROTO_SRCS} ${PROTO_HDRS})
53#
54#  ====================================================================
55
56#=============================================================================
57# Copyright 2009 Kitware, Inc.
58# Copyright 2009-2011 Philip Lowman <philip@yhbt.com>
59# Copyright 2008 Esben Mose Hansen, Ange Optimization ApS
60#
61# Redistribution and use in source and binary forms, with or without
62# modification, are permitted provided that the following conditions
63# are met:
64#
65# * Redistributions of source code must retain the above copyright
66#   notice, this list of conditions and the following disclaimer.
67#
68# * Redistributions in binary form must reproduce the above copyright
69#   notice, this list of conditions and the following disclaimer in the
70#   documentation and/or other materials provided with the distribution.
71#
72# * Neither the names of Kitware, Inc., the Insight Software Consortium,
73#   nor the names of their contributors may be used to endorse or promote
74#   products derived from this software without specific prior written
75#   permission.
76#
77# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
78# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
79# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
80# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
81# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
82# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
83# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
84# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
85# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
86# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
87# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
88#
89#=============================================================================
90#
91# Changes
92# 2013.01.31 - Pavlo Ilin - used Modules/FindProtobuf.cmake from cmake 2.8.10 to
93#                           write FindNanopb.cmake
94#
95#=============================================================================
96
97
98function(NANOPB_GENERATE_CPP SRCS HDRS)
99  if(NOT ARGN)
100    return()
101  endif()
102
103  if(NANOPB_GENERATE_CPP_APPEND_PATH)
104    # Create an include path for each file specified
105    foreach(FIL ${ARGN})
106      get_filename_component(ABS_FIL ${FIL} ABSOLUTE)
107      get_filename_component(ABS_PATH ${ABS_FIL} PATH)
108
109      list(FIND _nanobp_include_path ${ABS_PATH} _contains_already)
110      if(${_contains_already} EQUAL -1)
111          list(APPEND _nanobp_include_path -I ${ABS_PATH})
112      endif()
113    endforeach()
114  else()
115    set(_nanobp_include_path -I ${CMAKE_CURRENT_SOURCE_DIR})
116  endif()
117
118  if(DEFINED NANOPB_IMPORT_DIRS)
119    foreach(DIR ${NANOPB_IMPORT_DIRS})
120      get_filename_component(ABS_PATH ${DIR} ABSOLUTE)
121      list(FIND _nanobp_include_path ${ABS_PATH} _contains_already)
122      if(${_contains_already} EQUAL -1)
123          list(APPEND _nanobp_include_path -I ${ABS_PATH})
124      endif()
125    endforeach()
126  endif()
127
128  set(${SRCS})
129  set(${HDRS})
130  get_filename_component(GENERATOR_PATH ${NANOPB_GENERATOR_EXECUTABLE} PATH)
131
132  foreach(FIL ${ARGN})
133    get_filename_component(ABS_FIL ${FIL} ABSOLUTE)
134    get_filename_component(FIL_WE ${FIL} NAME_WE)
135
136    list(APPEND ${SRCS} "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.c")
137    list(APPEND ${HDRS} "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.h")
138
139    add_custom_command(
140      OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb"
141      COMMAND  ${PROTOBUF_PROTOC_EXECUTABLE}
142      ARGS -I${GENERATOR_PATH} -I${CMAKE_CURRENT_BINARY_DIR} ${_nanobp_include_path} -o${FIL_WE}.pb ${ABS_FIL}
143      DEPENDS ${ABS_FIL}
144      COMMENT "Running C++ protocol buffer compiler on ${FIL}"
145      VERBATIM )
146
147    add_custom_command(
148      OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.c"
149             "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.h"
150      COMMAND python
151      ARGS ${NANOPB_GENERATOR_EXECUTABLE} ${FIL_WE}.pb
152      DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb"
153      COMMENT "Running nanopb generator on ${FIL_WE}.pb"
154      VERBATIM )
155  endforeach()
156
157  set_source_files_properties(${${SRCS}} ${${HDRS}} PROPERTIES GENERATED TRUE)
158  set(${SRCS} ${${SRCS}} ${NANOPB_SRCS} PARENT_SCOPE)
159  set(${HDRS} ${${HDRS}} ${NANOPB_HDRS} PARENT_SCOPE)
160
161endfunction()
162
163
164
165#
166# Main.
167#
168
169# By default have NANOPB_GENERATE_CPP macro pass -I to protoc
170# for each directory where a proto file is referenced.
171if(NOT DEFINED NANOPB_GENERATE_CPP_APPEND_PATH)
172  set(NANOPB_GENERATE_CPP_APPEND_PATH TRUE)
173endif()
174
175# Find the include directory
176find_path(NANOPB_INCLUDE_DIRS
177    pb.h
178    PATHS ${NANOPB_SRC_ROOT_FOLDER}
179)
180mark_as_advanced(NANOPB_INCLUDE_DIRS)
181
182# Find nanopb source files
183set(NANOPB_SRCS)
184set(NANOPB_HDRS)
185list(APPEND _nanopb_srcs pb_decode.c pb_encode.c)
186list(APPEND _nanopb_hdrs pb_decode.h pb_encode.h pb.h)
187
188foreach(FIL ${_nanopb_srcs})
189  find_file(${FIL}__nano_pb_file NAMES ${FIL} PATHS ${NANOPB_SRC_ROOT_FOLDER} ${NANOPB_INCLUDE_DIRS})
190  list(APPEND NANOPB_SRCS "${${FIL}__nano_pb_file}")
191  mark_as_advanced(${FIL}__nano_pb_file)
192endforeach()
193
194foreach(FIL ${_nanopb_hdrs})
195  find_file(${FIL}__nano_pb_file NAMES ${FIL} PATHS ${NANOPB_INCLUDE_DIRS})
196  mark_as_advanced(${FIL}__nano_pb_file)
197  list(APPEND NANOPB_HDRS "${${FIL}__nano_pb_file}")
198endforeach()
199
200# Find the protoc Executable
201find_program(PROTOBUF_PROTOC_EXECUTABLE
202    NAMES protoc
203    DOC "The Google Protocol Buffers Compiler"
204    PATHS
205    ${PROTOBUF_SRC_ROOT_FOLDER}/vsprojects/Release
206    ${PROTOBUF_SRC_ROOT_FOLDER}/vsprojects/Debug
207)
208mark_as_advanced(PROTOBUF_PROTOC_EXECUTABLE)
209
210# Find nanopb generator
211find_file(NANOPB_GENERATOR_EXECUTABLE
212    NAMES nanopb_generator.py
213    DOC "nanopb generator"
214    PATHS
215    ${NANOPB_SRC_ROOT_FOLDER}/generator
216)
217mark_as_advanced(NANOPB_GENERATOR_EXECUTABLE)
218
219include(FindPackageHandleStandardArgs)
220FIND_PACKAGE_HANDLE_STANDARD_ARGS(NANOPB DEFAULT_MSG
221  NANOPB_INCLUDE_DIRS
222  NANOPB_SRCS NANOPB_HDRS
223  NANOPB_GENERATOR_EXECUTABLE
224  PROTOBUF_PROTOC_EXECUTABLE
225  )
226