Install protobuf from cmake project

Additional export as "protobuf" package
for importing from other cmake projects

cmake/CMakeLists.txt

@@ -1,13 +1,35 @@
+# Minimum CMake required
 cmake_minimum_required(VERSION 2.8)
 
+# Project
 project(protobuf C CXX)
 
+# Options
 option(BUILD_TESTING "Build tests" ON)
 option(BUILD_SHARED_LIBS "Build Shared Libraries" OFF)
 if (MSVC)
   option(ZLIB "Build with zlib support" OFF)
 endif (MSVC)
 
+# Path to common header
+set(protobuf_COMMON_HEADER "../src/google/protobuf/stubs/common.h")
+
+# Parse version from common header
+file(STRINGS "${protobuf_COMMON_HEADER}" protobuf_VERSION_LINE
+  LIMIT_COUNT 1
+  REGEX "^#define GOOGLE_PROTOBUF_VERSION [0-9]+$")
+string(REGEX REPLACE "^.*PROTOBUF_VERSION ([0-9]+).*$" "\\1"
+    protobuf_VERSION_NUMBER "${protobuf_VERSION_LINE}")
+math(EXPR protobuf_VERSION_MICRO
+  "${protobuf_VERSION_NUMBER} % 1000")
+math(EXPR protobuf_VERSION_MINOR
+  "(${protobuf_VERSION_NUMBER} - ${protobuf_VERSION_MICRO}) % 1000000 / 1000")
+math(EXPR protobuf_VERSION_MAJOR
+  "(${protobuf_VERSION_NUMBER} - ${protobuf_VERSION_MINOR} * 1000 - ${protobuf_VERSION_MICRO}) % 1000000000 / 1000000")
+set(protobuf_VERSION_PATCH ${protobuf_VERSION_MICRO})
+set(protobuf_VERSION
+  "${protobuf_VERSION_MAJOR}.${protobuf_VERSION_MINOR}.${protobuf_VERSION_MICRO}")
+
 add_definitions(-DGOOGLE_PROTOBUF_CMAKE_BUILD)
 
 find_package(Threads REQUIRED)
@@ -73,6 +95,9 @@ include(libprotobuf-lite.cmake)
 include(libprotobuf.cmake)
 include(libprotoc.cmake)
 include(protoc.cmake)
+
 if (BUILD_TESTING)
   include(tests.cmake)
 endif (BUILD_TESTING)
+
+include(install.cmake)

cmake/install.cmake

@@ -0,0 +1,58 @@
+include(GNUInstallDirs)
+
+foreach(_library
+  libprotobuf-lite
+  libprotobuf
+  libprotoc)
+  set_property(TARGET ${_library}
+    PROPERTY INTERFACE_INCLUDE_DIRECTORIES $<INSTALL_INTERFACE:include>)
+  install(TARGETS ${_library} EXPORT protobuf-targets
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT ${_library}
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT ${_library}
+    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT ${_library})
+endforeach()
+
+install(TARGETS protoc EXPORT protobuf-targets
+  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT protoc)
+
+if(MSVC)
+  file(STRINGS extract_includes.bat.in _extract_strings
+    REGEX "^copy")
+  foreach(_extract_string ${_extract_strings})
+    string(REPLACE "copy \${PROTOBUF_SOURCE_WIN32_PATH}\\" ""
+      _extract_string ${_extract_string})
+    string(REPLACE "\\" "/" _extract_string ${_extract_string})
+    string(REGEX MATCH "^[^ ]+"
+      _extract_from ${_extract_string})
+    string(REGEX REPLACE "^${_extract_from} ([^$]+)" "\\1"
+      _extract_to ${_extract_string})
+    get_filename_component(_extract_from "${protobuf_SOURCE_DIR}/${_extract_from}" ABSOLUTE)
+    get_filename_component(_extract_name ${_extract_to} NAME)
+    get_filename_component(_extract_to ${_extract_to} PATH)
+    if(EXISTS "${_extract_from}")
+      install(FILES "${_extract_from}"
+        DESTINATION "${_extract_to}"
+        COMPONENT protobuf-headers
+        RENAME "${_extract_name}")
+    else()
+      message(AUTHOR_WARNING "The file \"${_extract_from}\" is listed in "
+        "\"${protobuf_SOURCE_DIR}/cmake/extract_includes.bat.in\" "
+        "but there not exists. The file will not be installed.")
+    endif()
+  endforeach()
+endif()
+
+install(EXPORT protobuf-targets
+  DESTINATION "lib/cmake/protobuf"
+  COMPONENT protobuf-export)
+
+configure_file(protobuf-config.cmake.in
+  protobuf-config.cmake @ONLY)
+configure_file(protobuf-config-version.cmake.in
+  protobuf-config-version.cmake @ONLY)
+
+install(FILES
+  "${protobuf_BINARY_DIR}/protobuf-config.cmake"
+  "${protobuf_BINARY_DIR}/protobuf-config-version.cmake"
+  DESTINATION "lib/cmake/protobuf"
+  COMPONENT protobuf-export)

cmake/protobuf-config-version.cmake.in

@@ -0,0 +1 @@
+set(PACKAGE_VERSION @protobuf_VERSION@)

cmake/protobuf-config.cmake.in

@@ -0,0 +1 @@
+include("${CMAKE_CURRENT_LIST_DIR}/protobuf-targets.cmake")