From 84c0470bcbfe1ab84b595d71655e6fb95e7c90bc Mon Sep 17 00:00:00 2001
From: proller <proller@users.noreply.github.com>
Date: Sat, 9 Sep 2017 03:32:34 +0300
Subject: [PATCH] cmake: ccache detect proper version (#1222)

---
 CMakeLists.txt          |  8 ++------
 cmake/find_ccache.cmake | 15 +++++++++++++++
 2 files changed, 17 insertions(+), 6 deletions(-)
 create mode 100644 cmake/find_ccache.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f3669a53afb..985e5bfc6e9 100644
--- a/CMakeLists.txt
+++ b/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)
 
diff --git a/cmake/find_ccache.cmake b/cmake/find_ccache.cmake
new file mode 100644
index 00000000000..beb4e306156
--- /dev/null
+++ b/cmake/find_ccache.cmake
@@ -0,0 +1,15 @@
+
+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 ()