Check found libraries version to match user required version.
Protobuf compiler executable version is checked to be aligned with found
libraries, raising a warning message otherwise.
---
Modules/FindProtobuf.cmake | 59 +++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 56 insertions(+), 3 deletions(-)
diff --git a/Modules/FindProtobuf.cmake b/Modules/FindProtobuf.cmake
index 02aca1c..b3fcd23 100644
--- a/Modules/FindProtobuf.cmake
+++ b/Modules/FindProtobuf.cmake
@@ -15,6 +15,8 @@
# ``PROTOBUF_IMPORT_DIRS``
# List of additional directories to be searched for
# imported .proto files.
+# ``PROTOBUF_DEBUG``
+# Show debug messages.
#
# Defines the following variables:
#
@@ -302,10 +304,61 @@ find_program(PROTOBUF_PROTOC_EXECUTABLE
)
mark_as_advanced(PROTOBUF_PROTOC_EXECUTABLE)
+if(PROTOBUF_DEBUG)
+ message(STATUS "[ ${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE} ] "
+ "requested version of Google Protobuf is ${Protobuf_FIND_VERSION}")
+endif()
+
+if(PROTOBUF_INCLUDE_DIR)
+ set(_PROTOBUF_COMMON_HEADER
${PROTOBUF_INCLUDE_DIR}/google/protobuf/stubs/common.h)
+
+ if(PROTOBUF_DEBUG)
+ message(STATUS "[ ${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE} ] "
+ "location of common.h: ${_PROTOBUF_COMMON_HEADER}")
+ endif()
+
+ set(PROTOBUF_VERSION "")
+ set(PROTOBUF_LIB_VERSION "")
+ file(STRINGS ${_PROTOBUF_COMMON_HEADER} _PROTOBUF_COMMON_H_CONTENTS REGEX
"#define[ \t]+GOOGLE_PROTOBUF_VERSION[ \t]+")
+ if(_PROTOBUF_COMMON_H_CONTENTS MATCHES "#define[
\t]+GOOGLE_PROTOBUF_VERSION[ \t]+([0-9]+)")
+ set(PROTOBUF_LIB_VERSION "${CMAKE_MATCH_1}")
+ endif()
+ unset(_PROTOBUF_COMMON_H_CONTENTS)
+
+ math(EXPR _PROTOBUF_MAJOR_VERSION "${PROTOBUF_LIB_VERSION} / 1000000")
+ math(EXPR _PROTOBUF_MINOR_VERSION "${PROTOBUF_LIB_VERSION} / 1000 % 1000")
+ math(EXPR _PROTOBUF_SUBMINOR_VERSION "${PROTOBUF_LIB_VERSION} % 1000")
+ set(PROTOBUF_VERSION
"${_PROTOBUF_MAJOR_VERSION}.${_PROTOBUF_MINOR_VERSION}.${_PROTOBUF_SUBMINOR_VERSION}")
+
+ if(PROTOBUF_DEBUG)
+ message(STATUS "[ ${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE} ] "
+ "${_PROTOBUF_COMMON_HEADER} reveals protobuf ${PROTOBUF_VERSION}")
+ endif()
-include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
-FIND_PACKAGE_HANDLE_STANDARD_ARGS(Protobuf DEFAULT_MSG
- PROTOBUF_LIBRARY PROTOBUF_INCLUDE_DIR)
+ # Check Protobuf compiler version to be aligned with libraries version
+ execute_process(COMMAND ${PROTOBUF_PROTOC_EXECUTABLE} --version
+ OUTPUT_VARIABLE _PROTOBUF_PROTOC_EXECUTABLE_VERSION)
+
+ if("${_PROTOBUF_PROTOC_EXECUTABLE_VERSION}" MATCHES "libprotoc ([0-9\.]+)")
+ set(_PROTOBUF_PROTOC_EXECUTABLE_VERSION "${CMAKE_MATCH_1}")
+ endif()
+
+ if(PROTOBUF_DEBUG)
+ message(STATUS "[ ${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE} ] "
+ "${PROTOBUF_PROTOC_EXECUTABLE} reveals version
${_PROTOBUF_PROTOC_EXECUTABLE_VERSION}")
+ endif()
+
+ if(NOT "${_PROTOBUF_PROTOC_EXECUTABLE_VERSION}" VERSION_EQUAL
"${PROTOBUF_VERSION}")
+ message(WARNING "Protobuf compiler version
${_PROTOBUF_PROTOC_EXECUTABLE_VERSION}"
+ " doesn't match library version ${PROTOBUF_VERSION}")
+ endif()
+endif()
+
+include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(Protobuf
+ REQUIRED_VARS PROTOBUF_LIBRARIES PROTOBUF_INCLUDE_DIR
+ VERSION_VAR PROTOBUF_VERSION
+)
if(PROTOBUF_FOUND)
set(PROTOBUF_INCLUDE_DIRS ${PROTOBUF_INCLUDE_DIR})
--
1.9.1
--
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