cmake: ccache detect proper version (#1222)

CMakeLists.txt

@@ -30,11 +30,7 @@ cmake_policy (SET CMP0012 NEW) # Don't dereference TRUE and FALSE
 # Write compile_commands.json
 set(CMAKE_EXPORT_COMPILE_COMMANDS 1)
 
-find_program (CCACHE_FOUND ccache)
-if (CCACHE_FOUND AND NOT CMAKE_CXX_COMPILER_LAUNCHER MATCHES "ccache" AND NOT CMAKE_CXX_COMPILER MATCHES "ccache")
-  set_property (GLOBAL PROPERTY RULE_LAUNCH_COMPILE "ccache")
-  set_property (GLOBAL PROPERTY RULE_LAUNCH_LINK "ccache")
-endif ()
+include (cmake/find_ccache.cmake)
 
 if (NOT CMAKE_BUILD_TYPE OR CMAKE_BUILD_TYPE STREQUAL "None")
     message (STATUS "CMAKE_BUILD_TYPE is not set, set to default = RELWITHDEBINFO")
@@ -190,7 +186,7 @@ if (UNBUNDLED OR NOT (CMAKE_SYSTEM MATCHES "Linux" OR APPLE) OR ARCH_32)
     option (NO_WERROR "Disable -Werror compiler option" ON)
 endif ()
 
-message (STATUS "Building for: ${CMAKE_SYSTEM} ${CMAKE_SYSTEM_PROCESSOR} ${CMAKE_LIBRARY_ARCHITECTURE} ; USE_STATIC_LIBRARIES=${USE_STATIC_LIBRARIES} MAKE_STATIC_LIBRARIES=${MAKE_STATIC_LIBRARIES} UNBUNDLED=${UNBUNDLED} CCACHE=${CCACHE_FOUND}")
+message (STATUS "Building for: ${CMAKE_SYSTEM} ${CMAKE_SYSTEM_PROCESSOR} ${CMAKE_LIBRARY_ARCHITECTURE} ; USE_STATIC_LIBRARIES=${USE_STATIC_LIBRARIES} MAKE_STATIC_LIBRARIES=${MAKE_STATIC_LIBRARIES} UNBUNDLED=${UNBUNDLED} CCACHE=${CCACHE_FOUND} ${CCACHE_VERSION}")
 
 include(GNUInstallDirs)
 

cmake/find_ccache.cmake

+
+find_program (CCACHE_FOUND ccache)
+if (CCACHE_FOUND AND NOT CMAKE_CXX_COMPILER_LAUNCHER MATCHES "ccache" AND NOT CMAKE_CXX_COMPILER MATCHES "ccache")
+    execute_process(COMMAND ${CCACHE_FOUND} "-V" OUTPUT_VARIABLE CCACHE_VERSION)
+    string(REGEX REPLACE "ccache version ([0-9\\.]+).*" "\\1" CCACHE_VERSION ${CCACHE_VERSION} )
+    string(COMPARE GREATER ${CCACHE_VERSION} "3.2.0" CCACHE_VERSION_OK)
+
+    if (CCACHE_VERSION_OK)
+       #message(STATUS "Using ${CCACHE_FOUND} ${CCACHE_VERSION}")
+       set_property (GLOBAL PROPERTY RULE_LAUNCH_COMPILE ${CCACHE_FOUND})
+       set_property (GLOBAL PROPERTY RULE_LAUNCH_LINK ${CCACHE_FOUND})
+    else ()
+       message(STATUS "Not using ${CCACHE_FOUND} ${CCACHE_VERSION} bug: https://bugzilla.samba.org/show_bug.cgi?id=8118")
+    endif ()
+endif ()