FindBoost: provide the version in x.y.z format

Modules/FindBoost.cmake

@@ -35,6 +35,7 @@ case results are reported in variables::
   Boost_MAJOR_VERSION    - Boost major version number (X in X.y.z)
   Boost_MINOR_VERSION    - Boost minor version number (Y in x.Y.z)
   Boost_SUBMINOR_VERSION - Boost subminor version number (Z in x.y.Z)
+  Boost_VERSION_STRING   - Boost version number in x.y.z format
   Boost_LIB_DIAGNOSTIC_DEFINITIONS (Windows)
                          - Pass to add_definitions() to have diagnostic
                            information about Boost's automatic linking
@@ -1371,6 +1372,7 @@ if(Boost_INCLUDE_DIR)
   math(EXPR Boost_MAJOR_VERSION "${Boost_VERSION} / 100000")
   math(EXPR Boost_MINOR_VERSION "${Boost_VERSION} / 100 % 1000")
   math(EXPR Boost_SUBMINOR_VERSION "${Boost_VERSION} % 100")
+  set(Boost_VERSION_STRING "${Boost_MAJOR_VERSION}.${Boost_MINOR_VERSION}.${Boost_SUBMINOR_VERSION}")
 
   string(APPEND Boost_ERROR_REASON
     "Boost version: ${Boost_MAJOR_VERSION}.${Boost_MINOR_VERSION}.${Boost_SUBMINOR_VERSION}\nBoost include path: ${Boost_INCLUDE_DIR}")

Tests/FindBoost/Test/CMakeLists.txt

@@ -14,7 +14,7 @@ if(NOT Boost_PROGRAM_OPTIONS_FOUND)
 endif(NOT Boost_PROGRAM_OPTIONS_FOUND)
 
 add_definitions(-DCMAKE_EXPECTED_BOOST_VERSION="${Boost_VERSION}")
-add_definitions(-DCMAKE_EXPECTED_BOOST_VERSION_COMPONENTS="${Boost_MAJOR_VERSION}.${Boost_MINOR_VERSION}.${Boost_SUBMINOR_VERSION}")
+add_definitions(-DCMAKE_EXPECTED_BOOST_VERSION_COMPONENTS="${Boost_VERSION_STRING}")
 
 add_executable(test_boost_tgt main.cxx)
 target_link_libraries(test_boost_tgt