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#
# CMake module to support ccache
#
# see https://crascit.com/2016/04/09/using-ccache-with-cmake/
#
find_program(CCACHE_PROGRAM ccache)
# Note: REQUIRED keyword introduced in CMake 3.18
if(CCACHE_PROGRAM)
message(STATUS "Configuring ccache with ${CCACHE_PROGRAM}")
set(C_LAUNCHER "${CCACHE_PROGRAM}")
set(CXX_LAUNCHER "${CCACHE_PROGRAM}")
# Set up wrapper scripts
set(CCACHE_LAUNCH_C ${CMAKE_BINARY_DIR}/ccache-launch-c)
file(WRITE ${CCACHE_LAUNCH_C} "\
#!/bin/sh
# Xcode generator doesn't include the compiler as the
# first argument, Ninja and Makefiles do. Handle both cases.
if [ \"$1\" = \"${CMAKE_C_COMPILER}\" ] ; then
shift
fi
export CCACHE_CPP2=true
exec \"${C_LAUNCHER}\" \"${CMAKE_C_COMPILER}\" \"$@\"
")
set(CCACHE_LAUNCH_CXX ${CMAKE_BINARY_DIR}/ccache-launch-cxx)
file(WRITE ${CCACHE_LAUNCH_CXX} "\
#!/bin/sh
# Xcode generator doesn't include the compiler as the
# first argument, Ninja and Makefiles do. Handle both cases.
if [ \"$1\" = \"${CMAKE_CXX_COMPILER}\" ] ; then
shift
fi
export CCACHE_CPP2=true
exec \"${CXX_LAUNCHER}\" \"${CMAKE_CXX_COMPILER}\" \"$@\"
")
# Note: file(CHMOD) introduced in CMake 3.19
execute_process(
COMMAND chmod a+rx
"${CCACHE_LAUNCH_C}"
"${CCACHE_LAUNCH_CXX}"
)
if(CMAKE_GENERATOR STREQUAL "Xcode")
# Set Xcode project attributes to route compilation and linking
# through our scripts
set(CMAKE_XCODE_ATTRIBUTE_CC "${CCACHE_LAUNCH_C}")
set(CMAKE_XCODE_ATTRIBUTE_CXX "${CCACHE_LAUNCH_CXX}")
set(CMAKE_XCODE_ATTRIBUTE_LD "${CCACHE_LAUNCH_C}")
set(CMAKE_XCODE_ATTRIBUTE_LDPLUSPLUS "${CCACHE_LAUNCH_CXX}")
else()
# Support Unix Makefiles and Ninja
set(CMAKE_C_COMPILER_LAUNCHER "${CCACHE_LAUNCH_C}")
set(CMAKE_CXX_COMPILER_LAUNCHER "${CCACHE_LAUNCH_CXX}")
endif()
else()
message(SEND_ERROR "Ccache requested, but ccache was not found")
endif()
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