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pradeep
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Enable ccache based compilation when it is available (arrayfire#2893)
* Enable ccache based compilation when it is available automatically. If not present, no change in behavior. * The user can turn off using ccache using the cmake option `AF_USE_CCACHE`. Note that this is an advanced cmake option.
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‎CMakeLists.txt‎

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@@ -11,6 +11,7 @@ project(ArrayFire VERSION 3.7.1 LANGUAGES C CXX)
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set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/CMakeModules")
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include(config_ccache)
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include(AFBuildConfigurations)
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include(AFInstallDirs)
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include(CMakeDependentOption)

‎CMakeModules/config_ccache.cmake‎

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# picked up original content from https://crascit.com/2016/04/09/using-ccache-with-cmake/
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if (UNIX)
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find_program(CCACHE_PROGRAM ccache)
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set(CCACHE_FOUND OFF)
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if(CCACHE_PROGRAM)
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set(CCACHE_FOUND ON)
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endif()
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option(AF_USE_CCACHE "Use ccache when compiling" ${CCACHE_FOUND})
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if(${AF_USE_CCACHE})
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# Set up wrapper scripts
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set(C_LAUNCHER "${CCACHE_PROGRAM}")
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set(CXX_LAUNCHER "${CCACHE_PROGRAM}")
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configure_file(${ArrayFire_SOURCE_DIR}/CMakeModules/launch-c.in launch-c)
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configure_file(${ArrayFire_SOURCE_DIR}/CMakeModules/launch-cxx.in launch-cxx)
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execute_process(COMMAND chmod a+rx
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"${ArrayFire_BINARY_DIR}/launch-c"
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"${ArrayFire_BINARY_DIR}/launch-cxx"
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)
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if(CMAKE_GENERATOR STREQUAL "Xcode")
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# Set Xcode project attributes to route compilation and linking
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# through our scripts
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set(CMAKE_XCODE_ATTRIBUTE_CC "${ArrayFire_BINARY_DIR}/launch-c")
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set(CMAKE_XCODE_ATTRIBUTE_CXX "${ArrayFire_BINARY_DIR}/launch-cxx")
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set(CMAKE_XCODE_ATTRIBUTE_LD "${ArrayFire_BINARY_DIR}/launch-c")
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set(CMAKE_XCODE_ATTRIBUTE_LDPLUSPLUS "${ArrayFire_BINARY_DIR}/launch-cxx")
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else()
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# Support Unix Makefiles and Ninja
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set(CMAKE_C_COMPILER_LAUNCHER "${ArrayFire_BINARY_DIR}/launch-c")
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set(CMAKE_CXX_COMPILER_LAUNCHER "${ArrayFire_BINARY_DIR}/launch-cxx")
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endif()
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endif()
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mark_as_advanced(CCACHE_PROGRAM)
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mark_as_advanced(AF_USE_CCACHE)
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endif()

‎CMakeModules/launch-c.in‎

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#!/bin/sh
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# Xcode generator doesn't include the compiler as the
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# first argument, Ninja and Makefiles do. Handle both cases.
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if [[ "$1" = "${CMAKE_C_COMPILER}" ]] ; then
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shift
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fi
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export CCACHE_CPP2=true
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exec "${C_LAUNCHER}" "${CMAKE_C_COMPILER}" "$@"

‎CMakeModules/launch-cxx.in‎

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#!/bin/sh
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# Xcode generator doesn't include the compiler as the
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# first argument, Ninja and Makefiles do. Handle both cases.
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if [[ "$1" = "${CMAKE_CXX_COMPILER}" ]] ; then
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shift
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fi
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export CCACHE_CPP2=true
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exec "${CXX_LAUNCHER}" "${CMAKE_CXX_COMPILER}" "$@"

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