refactor compiler cache setting

for covering the case of ccache and clcache

CMakeLists.txt

@@ -64,19 +64,38 @@ IF(NOT ("${BUILD_TYPE_UC}" STREQUAL "DISTRIBUTION"))
 	SET(CMAKE_CXX_FLAGS "")
 ENDIF(NOT ("${BUILD_TYPE_UC}" STREQUAL "DISTRIBUTION"))
 
-# CCACHE
-OPTION(ENABLE_CCACHE "Enable ccache for compilation" ON)
-FIND_PACKAGE(CCache)
-if(CCACHE_FOUND AND ENABLE_CCACHE)
-	SET(CCACHE "ccache" CACHE STRING "ccache")
-	SET(CMAKE_C_COMPILER_ARG1 ${CMAKE_C_COMPILER})
-	SET(CMAKE_C_COMPILER ${CCACHE})
-	SET(CMAKE_CXX_COMPILER_ARG1 ${CMAKE_CXX_COMPILER})
-	SET(CMAKE_CXX_COMPILER ${CCACHE})
-	SET(CMAKE_C_FLAGS "${CCACHE_FLAGS} ${CMAKE_C_FLAGS}")
-	SET(CMAKE_CXX_FLAGS "${CCACHE_FLAGS} ${CMAKE_CXX_FLAGS}")
+# compilation cache
+if (("${CMAKE_GENERATOR}" STREQUAL "Unix Makefiles") OR
+	("${CMAKE_GENERATOR}" STREQUAL "NMake Makefiles") OR
+	("${CMAKE_GENERATOR}" STREQUAL "Ninja"))
+	OPTION(ENABLE_COMPILER_CACHE "Enable cache for compilation" ON)
 endif()
 
+if (ENABLE_COMPILER_CACHE)
+	if (MSVC)
+		find_program(CLCACHE_FOUND clcache)
+		if (CLCACHE_FOUND)
+			set(COMPILER_CACHE_EXECUTABLE CLCACHE_FOUND)
+		endif ()
+	else()
+		FIND_PACKAGE(CCache)
+		if (CCACHE_FOUND)
+			SET(COMPILER_CACHE_EXECUTABLE "ccache")
+			SET(CMAKE_C_FLAGS "${CCACHE_FLAGS} ${CMAKE_C_FLAGS}")
+			SET(CMAKE_CXX_FLAGS "${CCACHE_FLAGS} ${CMAKE_CXX_FLAGS}")
+		endif()
+	endif()
+
+	if (COMPILER_CACHE_EXECUTABLE)
+		foreach(LANG C CXX)
+			if(NOT DEFINED CMAKE_${LANG}_COMPILER_LAUNCHER AND NOT CMAKE_${LANG}_COMPILER MATCHES ".*/${COMPILER_CACHE_EXECUTABLE}$")
+				message(STATUS "Enabling ${COMPILER_CACHE_EXECUTABLE} for ${LANG}")
+				set(CMAKE_${LANG}_COMPILER_LAUNCHER ${COMPILER_CACHE_EXECUTABLE} CACHE STRING "")
+			endif()
+		endforeach()
+	endif()
+endif ()
+
 ################# VARIABLES #####################
 SET(INCLUDES "")
 

appveyor.yml

@@ -7,7 +7,7 @@ cache:
 environment:
   matrix:
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-      VSVER: Visual Studio 14 2015 Win64
+      GENERATOR: Ninja
       PYTHON: "3.6"
   APPVEYOR_SAVE_CACHE_ON_ERROR: true
 

scripts/appveyor-setup.bat

@@ -16,8 +16,12 @@ conda info -a
 @rem Use clcache for faster builds
 pip install -q git+https://github.com/frerich/clcache.git
 clcache -s
-set CC=clcache
-set CXX=clcache
 set CLCACHE_SERVER=1
 set CLCACHE_HARDLINK=1
 powershell.exe -Command "Start-Process clcache-server"
+
+conda create -n shogun -q -y python=%PYTHON% ^
+    setuptools numpy scipy eigen rxcpp ^
+    cmake snappy zlib ctags ply ninja
+
+call activate shogun

scripts/msvc-build.bat

@@ -1,17 +1,12 @@
 @echo on
 
-conda create -n shogun -q -y python=%PYTHON% ^
-    setuptools numpy scipy eigen rxcpp ^
-    cmake snappy zlib ctags ply
-call activate shogun
-
 mkdir %APPVEYOR_BUILD_FOLDER%\build
 pushd %APPVEYOR_BUILD_FOLDER%\build
 
-cmake -G "%VSVER%" ^
+cmake -G "%GENERATOR%" ^
       -DCMAKE_BUILD_TYPE=%CONFIGURATION% ^
       -DCMAKE_INSTALL_PREFIX=%CONDA_PREFIX%\Library ^
       -DBUILD_META_EXAMPLES=OFF ^
       -DENABLE_TESTING=ON .. || exit /B
 
-cmake --build . --target install --config %CONFIGURATION% -- /maxcpucount:2 || exit /B
+cmake --build . --target install --config %CONFIGURATION% -- -j2 || exit /B