CMakeLists.txt

cmake_minimum_required (VERSION 3.1)
find_package(PkgConfig)
include(${CMAKE_ROOT}/Modules/ExternalProject.cmake)
include(CheckSymbolExists)

####
# General configuration
####
option(INCLUDE_COMPILER "Includes the VC4C compiler" ON)
option(BUILD_TESTING "Build testing program" OFF)
option(BUILD_ICD "Build with support for ICD" ON)
option(IMAGE_SUPPORT "Experimental image support" OFF)
# Option whether to use register-poking (faster) or mailbox-calls (synchronized system-wide) to run kernels
option(REGISTER_POKE_KERNELS "Use the faster way of register to run kernels" ON)
# Option to enable/disable test-program
option(BUILD_DEBUG "Build with debugging symbols. Otherwise build for performance" OFF)
# Option to enable/disable cross compilation
option(CROSS_COMPILE "Cross compile for Raspbian" OFF)
# Option whether to create deb package
option(BUILD_DEB_PACKAGE "Enables creating .deb package" ON)

if(CROSS_COMPILE)
        set (CMAKE_LIBRARY_ARCHITECTURE "arm-linux-gnueabihf")
	if(NOT CROSS_COMPILER_PATH)
		set(CROSS_COMPILER_PATH "/usr/bin")
	endif()

	if(NOT CROSS_COMPILER_PREFIX)
		set(CROSS_COMPILER_PREFIX "arm-linux-gnueabihf-")
	endif()

        if (SYSROOT_CROSS)
          # set(CMAKE_SYSROOT ${SYSROOT_CROSS})
          set(CMAKE_FIND_ROOT_PATH ${SYSROOT_CROSS})
          set(SYSROOT_LIBRARY_FLAGS "-Wl,-rpath-link,${SYSROOT_CROSS}/lib/arm-linux-gnueabihf:${SYSROOT_CROSS}/usr/lib/arm-linux-gnueabihf")
          message(STATUS "sysroot: ${SYSROOT_CROSS}")
        endif()

        include(cmake/RaspberryPi.cmake)
	message(STATUS "Cross compiling for Raspbian with compiler: ${CMAKE_CXX_COMPILER}")
endif()

# Set C++ standard to C++14 without any extensions (e.g. GNU)
set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)
set(CMAKE_CXX_FLAGS_DEBUG "-g3 -rdynamic")
set(CMAKE_CXX_FLAGS_RELEASE "-O3")

project (VC4CL VERSION 0.4)

if(BUILD_DEBUG)
	SET(CMAKE_BUILD_TYPE Debug)
else()
	SET(CMAKE_BUILD_TYPE Release)
endif()

####
# Dependencies
####

# To allow off-line build, check if off-line and if so, disable updating of dependencies
execute_process(COMMAND ping -c 1 -W 10 github.com RESULT_VARIABLE PING_ERROR)
if(PING_ERROR)
	# A result of != 0 is an error, so disable updating
	set_property(DIRECTORY ${VC4C_SOURCE_DIR} PROPERTY EP_UPDATE_DISCONNECTED 1)
	message(WARNING "Building in off-line mode, some dependencies might not be up-to-date!")
else()
	set_property(DIRECTORY ${VC4C_SOURCE_DIR} PROPERTY EP_UPDATE_DISCONNECTED 0)
endif()

# Check for OpenCL headers
find_package(OpenCL REQUIRED)
message(STATUS "Found headers for OpenCL up to version ${OpenCL_VERSION_STRING} located in ${OpenCL_INCLUDE_DIRS}")

if(INCLUDE_COMPILER)
	if(NOT VC4C_HEADER_PATH)
		find_file(VC4C_HEADER_PATH_FOUND "VC4C.h" HINTS "${PROJECT_SOURCE_DIR}/lib/vc4c/include" "${PROJECT_SOURCE_DIR}/../VC4C/include" "/usr/local/include/vc4cc" "/usr/include/vc4cc")
		if(VC4C_HEADER_PATH_FOUND)
			set(VC4C_HEADER_PATH "${VC4C_HEADER_PATH_FOUND}")
		endif()
	endif()
	if(NOT VC4CC_LIBRARY)
		find_library(VC4CC_LIBRARY NAMES VC4CC libVC4CC HINTS "${PROJECT_SOURCE_DIR}/lib/vc4c/build" "${PROJECT_SOURCE_DIR}/../VC4C/build" "/usr/local/lib/" "/usr/lib")
	endif()
	if(VC4CC_LIBRARY)
		message(STATUS "VC4C library found: ${VC4CC_LIBRARY}")
	else()
		message(STATUS "No VC4C compiler library found!")
	endif()
	if(VC4C_HEADER_PATH)
		find_file(VC4C_TOOLS_HEADER_PATH "tools.h" HINTS "${PROJECT_SOURCE_DIR}/lib/vc4c/include" "${PROJECT_SOURCE_DIR}/../VC4C/include" "/usr/local/include/vc4cc" "/usr/include/vc4cc")
		message(STATUS "VC4C compiler header found at: ${VC4C_HEADER_PATH}")
	else()
		message(WARNING "No VC4C compiler header found!")
	endif()
endif()

# Enable Khronos ICD loader
if(BUILD_ICD)
	message(STATUS "Building with ICD support")

	if(NOT CROSS_COMPILE)
		# accoding to pocl, pkg-config doesn't work with cross-compiling
		pkg_search_module(OCL_ICD REQUIRED ocl-icd>=1.3)
		message(STATUS "Found Khronos ICD Loader in version ${OCL_ICD_VERSION} in ${OCL_ICD_LIBDIR}")
	endif()

	# Check clCreateProgramWithIL exist or not
	set(CMAKE_REQUIRED_LIBRARIES OpenCL)
	check_symbol_exists(clCreateProgramWithIL ${SYSROOT_CROSS}/usr/include/CL/cl.h AVAIL_clCreateProgramWithIL)
	if(NOT AVAIL_clCreateProgramWithIL)
		message(WARNING "clCreateProgramWithIL not found, strongly recommend to upgrade package opencl-headers!")
	endif()
	set(CMAKE_REQUIRED_LIBRARIES)
endif()

# Enable experimental image support
if(IMAGE_SUPPORT)
	message(STATUS "Building with experimental image support")
endif()

# Enable register poking for kernels
if(REGISTER_POKE_KERNELS)
	message(STATUS "Enabling register-poking to run kernels")
endif()

####
# Main files
####
#build all from ./src into ./build
add_subdirectory(./src build)
add_subdirectory(./tools build/tools)

if (BUILD_TESTING)
	enable_testing()
	if(NOT TARGET cpptest-lite)
		# only build cpptest-lite, if it doesn't exist yet (e.g. built by VC4CC)
		ExternalProject_Add(cpptest-lite-project
			PREFIX 				${CMAKE_BINARY_DIR}/build/cpptest-lite
			SOURCE_DIR 			${CMAKE_SOURCE_DIR}/lib/cpptest-lite
			GIT_REPOSITORY		https://github.com/doe300/cpptest-lite.git
			UPDATE_COMMAND 		git pull -f https://github.com/doe300/cpptest-lite.git
			STEP_TARGETS 		build
	  		EXCLUDE_FROM_ALL	TRUE
	  		TIMEOUT 			30		#Timeout for downloads, in seconds
  		        CMAKE_ARGS
    		          -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
    		          -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
  		          -DCMAKE_FIND_ROOT_PATH=${CMAKE_FIND_ROOT_PATH}

		)
	endif()
	add_subdirectory(test build/test)
endif (BUILD_TESTING)

##
# Installation targets
##
# Adds custom uninstall command
add_custom_target(uninstall_vc4cl "${CMAKE_COMMAND}" -P "cmake_uninstall.cmake")

add_custom_command(
  OUTPUT ${PROJECT_BINARY_DIR}/VC4CL.icd
  COMMAND echo "${CMAKE_INSTALL_PREFIX}/lib/libVC4CL.so" > ${PROJECT_BINARY_DIR}/VC4CL.icd
  )

if(BUILD_ICD)
	add_custom_target(generate_icd DEPENDS VC4CL.icd)
	add_dependencies(VC4CL generate_icd)
	install(FILES VC4CL.icd DESTINATION "/etc/OpenCL/vendors")
endif()

if (BUILD_DEB_PACKAGE)
	message(STATUS "build deb package...")

	# opencl-c-headers contains the host-side OpenCL headers
	set(PACKAGE_DEPENDENCIES "opencl-c-headers")
	if(BUILD_ICD)
		# If we build with ICD support, we need the library (from ocl-icd-opencl-dev and its dependencies)
		set(PACKAGE_DEPENDENCIES "${PACKAGE_DEPENDENCIES}, ocl-icd-opencl-dev")
	endif()
	if(INCLUDE_COMPILER)
		# If we build with VC4C enabled, we need the VC4C package
		set(PACKAGE_DEPENDENCIES "${PACKAGE_DEPENDENCIES}, vc4c")
	endif()

	set(CPACK_GENERATOR "DEB")
	set(CPACK_PACKAGING_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}")
	set(CPACK_PACKAGE_NAME "vc4cl")
	string(TIMESTAMP BUILD_TIMESTAMP "%Y-%m-%d")
	set(CPACK_PACKAGE_VERSION "${PROJECT_VERSION}-${BUILD_TIMESTAMP}")
	set(CPACK_DEBIAN_PACKAGE_ARCHITECTURE "armhf")
	set(CPACK_DEBIAN_PACKAGE_DEPENDS ${PACKAGE_DEPENDENCIES})
	if(BUILD_ICD)
		# provides the opencl-icd meta-package representing an OpenCL implementation which can be accessed via the ICD loader
		set(CPACK_DEBIAN_PACKAGE_PROVIDES "opencl-icd")
	endif()
	set(CPACK_PACKAGE_VENDOR "doe300")
	set(CPACK_PACKAGE_CONTACT "doe300@web.de")
	set(CPACK_PACKAGE_DESCRIPTION_SUMMARY "OpenCL Runtime for Videocore 4 (raspberrypi only)")
	set(CPACK_DEBIAN_PACKAGE_HOMEPAGE "https://github.com/doe300/VC4CL")
	set(CPACK_PACKAGE_FILE_NAME "vc4cl-0.4-Linux")
	set(CPACK_RESOURCE_FILE_LICENSE "${CMAKE_CURRENT_SOURCE_DIR}/LICENSE")
	include(CPack)
endif (BUILD_DEB_PACKAGE)