CMakeLists.txt - dawn - Git at Google

 # Copyright 2017 The Dawn Authors
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #     http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.

 cmake_minimum_required(VERSION 2.8)
 project(dawn C CXX)

 # List TARGET_OBJECTS in SOURCES target property.
 cmake_policy(SET CMP0051 NEW)

 if(CMAKE_SOURCE_DIR STREQUAL CMAKE_BINARY_DIR)
     message(FATAL_ERROR
         "In-source builds are unsupported. Use another directory, like build/, "
         "as your CMake build directory.\n"
         "Note: CMakeFiles/ and CMakeCache.txt may have been generated in the "
         "source directory. These may be removed.")
 endif()

 if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE "Debug" CACHE STRING
         "Build type (Debug, Release, RelWithDebInfo, MinSizeRel)" FORCE)
 endif()

 ################################################################################
 # Configuration options
 ################################################################################

 option(DAWN_USE_WERROR "Treat warnings as error (useful for CI)" 0)

 # Default values for the backend-enabling options
 set(ENABLE_D3D12 OFF)
 set(ENABLE_METAL OFF)
 set(ENABLE_OPENGL OFF)
 set(ENABLE_VULKAN OFF)
 if (WIN32)
     set(ENABLE_D3D12 ON)
     set(ENABLE_OPENGL ON)
     set(ENABLE_VULKAN ON)
 elseif(APPLE)
     set(ENABLE_METAL ON)
 elseif(UNIX)
     set(ENABLE_OPENGL ON)
     set(ENABLE_VULKAN ON)
 endif()

 option(DAWN_ENABLE_D3D12 "Enable compilation of the D3D12 backend" ${ENABLE_D3D12})
 option(DAWN_ENABLE_METAL "Enable compilation of the Metal backend" ${ENABLE_METAL})
 option(DAWN_ENABLE_NULL "Enable compilation of the Null backend" ON)
 option(DAWN_ENABLE_OPENGL "Enable compilation of the OpenGL backend" ${ENABLE_OPENGL})
 option(DAWN_ENABLE_VULKAN "Enable compilation of the Vulkan backend" ${ENABLE_VULKAN})
 option(DAWN_ALWAYS_ASSERT "Enable assertions on all build types" OFF)
 option(DAWN_USE_CPP17 "Use some optional C++17 features for compile-time checks" OFF)

 ################################################################################
 # Precompute compile flags and defines, functions to set them
 ################################################################################

 set(DAWN_FLAGS "")
 set(DAWN_DEFS "")
 set(DAWN_INTERNAL_FLAGS "")
 set(DAWN_INTERNAL_DEFS "")
 set(DAWN_GENERATED_FLAGS "")

 set(DAWN_ENABLE_ASSERTS $<OR:$<CONFIG:Debug>,$<BOOL:${DAWN_ALWAYS_ASSERT}>>)

 list(APPEND DAWN_DEFS $<${DAWN_ENABLE_ASSERTS}:DAWN_ENABLE_ASSERTS>)

 if (DAWN_USE_CPP17)
     list(APPEND DAWN_INTERNAL_DEFS "DAWN_CPP_VERSION=17")
 else()
     list(APPEND DAWN_INTERNAL_DEFS "DAWN_CPP_VERSION=14")
 endif()

 if (DAWN_ENABLE_D3D12)
     list(APPEND DAWN_INTERNAL_DEFS "DAWN_ENABLE_BACKEND_D3D12")
 endif()
 if (DAWN_ENABLE_METAL)
     list(APPEND DAWN_INTERNAL_DEFS "DAWN_ENABLE_BACKEND_METAL")
 endif()
 if (DAWN_ENABLE_NULL)
     list(APPEND DAWN_INTERNAL_DEFS "DAWN_ENABLE_BACKEND_NULL")
 endif()
 if (DAWN_ENABLE_OPENGL)
     list(APPEND DAWN_INTERNAL_DEFS "DAWN_ENABLE_BACKEND_OPENGL")
 endif()
 if (DAWN_ENABLE_VULKAN)
     list(APPEND DAWN_INTERNAL_DEFS "DAWN_ENABLE_BACKEND_VULKAN")
 endif()

 if (WIN32)
     # Define NOMINMAX to prevent conflicts between std::min/max and the min/max macros in WinDef.h
     list(APPEND DAWN_DEFS "NOMINMAX")
     # Avoid Windows.h including a lot of headers
     list(APPEND DAWN_DEFS "WIN32_LEAN_AND_MEAN")
     # Remove compile error where the mock Dawn creates too many sections for the old obj format.
     list(APPEND DAWN_FLAGS "/bigobj")
 endif()

 if (MSVC)
     list(APPEND DAWN_FLAGS "/std:c++14")
     list(APPEND DAWN_FLAGS "/EHsc")
     list(APPEND DAWN_FLAGS "/MP")
     list(APPEND DAWN_INTERNAL_FLAGS "/W4")
     # Allow declarations hiding members as it is used all over Dawn
     list(APPEND DAWN_INTERNAL_FLAGS "/wd4458")
     list(APPEND DAWN_INTERNAL_FLAGS "/wd4996") # Allow deprecated functions like strncpy

     list(APPEND DAWN_GENERATED_FLAGS "/wd4702") # Allow unreachable code
     list(APPEND DAWN_GENERATED_FLAGS "/wd4189") # Allow unused variable

     if(DAWN_USE_WERROR)
         list(APPEND DAWN_INTERNAL_FLAGS "/WX")
     endif()
 else()
     # Activate C++14 only on C++ files, not C files.
     list(APPEND DAWN_FLAGS "$<$<COMPILE_LANGUAGE:CXX>:-std=c++14>")
     # enable -Wold-style-cast on C++
     list(APPEND DAWN_FLAGS "$<$<COMPILE_LANGUAGE:CXX>:-Wold-style-cast>")

     list(APPEND DAWN_FLAGS "-fvisibility=hidden" "$<$<COMPILE_LANGUAGE:CXX>:-fno-rtti>" "-fno-exceptions")
     list(APPEND DAWN_FLAGS "-fPIC")

     list(APPEND DAWN_INTERNAL_FLAGS "-Wall" "-Wextra")
     list(APPEND DAWN_INTERNAL_FLAGS "-pedantic")
     list(APPEND DAWN_GENERATED_FLAGS "-Wno-unused-variable" "-Wno-unused-function")

     if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
         # don't break the build on older clang versions
         list(APPEND DAWN_INTERNAL_FLAGS "-Wno-error=unknown-warning-option")
         # GCC's conversion warnings are less useful than clang's
         list(APPEND DAWN_INTERNAL_FLAGS "-Wconversion" "-Wno-sign-conversion")
         # disable a clang-only -pedantic warning
         list(APPEND DAWN_INTERNAL_FLAGS "-Wno-gnu-zero-variadic-macro-arguments")
         # additional potentially useful warnings (feel free to remove if they prove un-useful)
         list(APPEND DAWN_INTERNAL_FLAGS "-Wextra-semi")
         list(APPEND DAWN_INTERNAL_FLAGS "-Wstrict-aliasing")
         list(APPEND DAWN_INTERNAL_FLAGS "-Wunreachable-code")
         list(APPEND DAWN_GENERATED_FLAGS "-Wno-unreachable-code")
         # Probably okay to enable if we establish a field naming convention:
         #list(APPEND DAWN_INTERNAL_FLAGS "-Wshadow")
     endif()
     if(DAWN_USE_WERROR)
         list(APPEND DAWN_INTERNAL_FLAGS "-Werror")
     endif()
 endif()

 function(DawnExternalTarget folder target)
     set_property(TARGET ${target} APPEND PROPERTY COMPILE_OPTIONS ${DAWN_FLAGS})
     set_property(TARGET ${target} APPEND PROPERTY COMPILE_DEFINITIONS ${DAWN_DEFS})
     set_property(TARGET ${target} PROPERTY FOLDER "dawn/${folder}")
 endfunction()

 function(DawnInternalTarget folder target)
     DawnExternalTarget("${folder}" ${target})
     set_property(TARGET ${target} APPEND PROPERTY COMPILE_OPTIONS ${DAWN_INTERNAL_FLAGS})
     set_property(TARGET ${target} APPEND PROPERTY COMPILE_DEFINITIONS ${DAWN_INTERNAL_DEFS})

     # Common include directories shared by all internal targets
     target_include_directories(${target} PRIVATE ${SRC_DIR} ${GENERATED_DIR} ${INCLUDE_DIR})

     # All internal targets require the headers to have been generated
     add_dependencies(${target} dawn_headers)

     # Group the target sources by folder to have folders show in Visual Studio
     if (MSVC)
         get_target_property(targetSources ${target} SOURCES)
         foreach(sourceFile IN ITEMS ${targetSources})
             if (IS_ABSOLUTE "${sourceFile}")
                 file(RELATIVE_PATH sourceFile "${CMAKE_CURRENT_SOURCE_DIR}" "${sourceFile}")
             endif()
             get_filename_component(sourceDir "${sourceFile}" PATH)
             string(REPLACE "/" "\\" sourceDir "${sourceDir}")
             source_group("${sourceDir}" FILES "${sourceFile}")
         endforeach()
     endif()
 endfunction()

 # Enable the creation of folders for Visual Studio projects
 set_property(GLOBAL PROPERTY USE_FOLDERS ON)

 # Output shared libs and executables directly in the build directory
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})

 ################################################################################
 # Generate the C and C++ Dawn APIs
 ################################################################################

 set(INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/src/include)
 set(SRC_DIR ${CMAKE_CURRENT_SOURCE_DIR}/src)

 add_subdirectory(generator)

 # Dawn header generation is in its own target so that it can be set as a build dependency for all
 # internal targets
 Generate(
     LIB_NAME dawn_headers
     LIB_TYPE OBJECT
     FOLDER ""
     PRINT_NAME "Dawn headers"
     COMMAND_LINE_ARGS
         ${GENERATOR_COMMON_ARGS}
         -T dawn_headers
 )
 # Older versions of CMake aren't able to know which linker to use without this and fail.
 set_property(TARGET dawn_headers PROPERTY LINKER_LANGUAGE "CXX")

 # libdawn.so/dll/dylib which contains the static proctable C interface and its C++ wrapper
 Generate(
     LIB_NAME libdawn_autogen
     LIB_TYPE OBJECT
     FOLDER "libdawn"
     PRINT_NAME "libdawn"
     COMMAND_LINE_ARGS
         ${GENERATOR_COMMON_ARGS}
         -T libdawn
 )
 target_compile_definitions(libdawn_autogen PRIVATE DAWN_IMPLEMENTATION)

 add_library(libdawn SHARED
     $<TARGET_OBJECTS:libdawn_autogen>
     ${INCLUDE_DIR}/dawn/dawn_export.h
     ${INCLUDE_DIR}/dawn/dawn_wsi.h
     ${INCLUDE_DIR}/dawn/EnumClassBitmasks.h
 )
 set_property(TARGET libdawn PROPERTY OUTPUT_NAME "dawn")
 target_include_directories(libdawn PUBLIC ${GENERATED_DIR} ${INCLUDE_DIR})
 DawnInternalTarget("libdawn" libdawn)

 ################################################################################
 # Call to other CMakeLists.txt
 ################################################################################

 add_subdirectory(third_party)

 add_subdirectory(src/common)
 add_subdirectory(src/dawn_native)
 add_subdirectory(src/dawn_wire)
 add_subdirectory(src/utils)
 add_subdirectory(src/tests)

 add_subdirectory(examples)
	# Copyright 2017 The Dawn Authors
	#
	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.
	# You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
	# limitations under the License.

	cmake_minimum_required(VERSION 2.8)
	project(dawn C CXX)

	# List TARGET_OBJECTS in SOURCES target property.
	cmake_policy(SET CMP0051 NEW)

	if(CMAKE_SOURCE_DIR STREQUAL CMAKE_BINARY_DIR)
	message(FATAL_ERROR
	"In-source builds are unsupported. Use another directory, like build/, "
	"as your CMake build directory.\n"
	"Note: CMakeFiles/ and CMakeCache.txt may have been generated in the "
	"source directory. These may be removed.")
	endif()

	if(NOT CMAKE_BUILD_TYPE)
	set(CMAKE_BUILD_TYPE "Debug" CACHE STRING
	"Build type (Debug, Release, RelWithDebInfo, MinSizeRel)" FORCE)
	endif()

	################################################################################
	# Configuration options
	################################################################################

	option(DAWN_USE_WERROR "Treat warnings as error (useful for CI)" 0)

	# Default values for the backend-enabling options
	set(ENABLE_D3D12 OFF)
	set(ENABLE_METAL OFF)
	set(ENABLE_OPENGL OFF)
	set(ENABLE_VULKAN OFF)
	if (WIN32)
	set(ENABLE_D3D12 ON)
	set(ENABLE_OPENGL ON)
	set(ENABLE_VULKAN ON)
	elseif(APPLE)
	set(ENABLE_METAL ON)
	elseif(UNIX)
	set(ENABLE_OPENGL ON)
	set(ENABLE_VULKAN ON)
	endif()

	option(DAWN_ENABLE_D3D12 "Enable compilation of the D3D12 backend" ${ENABLE_D3D12})
	option(DAWN_ENABLE_METAL "Enable compilation of the Metal backend" ${ENABLE_METAL})
	option(DAWN_ENABLE_NULL "Enable compilation of the Null backend" ON)
	option(DAWN_ENABLE_OPENGL "Enable compilation of the OpenGL backend" ${ENABLE_OPENGL})
	option(DAWN_ENABLE_VULKAN "Enable compilation of the Vulkan backend" ${ENABLE_VULKAN})
	option(DAWN_ALWAYS_ASSERT "Enable assertions on all build types" OFF)
	option(DAWN_USE_CPP17 "Use some optional C++17 features for compile-time checks" OFF)

	################################################################################
	# Precompute compile flags and defines, functions to set them
	################################################################################

	set(DAWN_FLAGS "")
	set(DAWN_DEFS "")
	set(DAWN_INTERNAL_FLAGS "")
	set(DAWN_INTERNAL_DEFS "")
	set(DAWN_GENERATED_FLAGS "")

	set(DAWN_ENABLE_ASSERTS $<OR:$<CONFIG:Debug>,$<BOOL:${DAWN_ALWAYS_ASSERT}>>)

	list(APPEND DAWN_DEFS $<${DAWN_ENABLE_ASSERTS}:DAWN_ENABLE_ASSERTS>)

	if (DAWN_USE_CPP17)
	list(APPEND DAWN_INTERNAL_DEFS "DAWN_CPP_VERSION=17")
	else()
	list(APPEND DAWN_INTERNAL_DEFS "DAWN_CPP_VERSION=14")
	endif()

	if (DAWN_ENABLE_D3D12)
	list(APPEND DAWN_INTERNAL_DEFS "DAWN_ENABLE_BACKEND_D3D12")
	endif()
	if (DAWN_ENABLE_METAL)
	list(APPEND DAWN_INTERNAL_DEFS "DAWN_ENABLE_BACKEND_METAL")
	endif()
	if (DAWN_ENABLE_NULL)
	list(APPEND DAWN_INTERNAL_DEFS "DAWN_ENABLE_BACKEND_NULL")
	endif()
	if (DAWN_ENABLE_OPENGL)
	list(APPEND DAWN_INTERNAL_DEFS "DAWN_ENABLE_BACKEND_OPENGL")
	endif()
	if (DAWN_ENABLE_VULKAN)
	list(APPEND DAWN_INTERNAL_DEFS "DAWN_ENABLE_BACKEND_VULKAN")
	endif()

	if (WIN32)
	# Define NOMINMAX to prevent conflicts between std::min/max and the min/max macros in WinDef.h
	list(APPEND DAWN_DEFS "NOMINMAX")
	# Avoid Windows.h including a lot of headers
	list(APPEND DAWN_DEFS "WIN32_LEAN_AND_MEAN")
	# Remove compile error where the mock Dawn creates too many sections for the old obj format.
	list(APPEND DAWN_FLAGS "/bigobj")
	endif()

	if (MSVC)
	list(APPEND DAWN_FLAGS "/std:c++14")
	list(APPEND DAWN_FLAGS "/EHsc")
	list(APPEND DAWN_FLAGS "/MP")
	list(APPEND DAWN_INTERNAL_FLAGS "/W4")
	# Allow declarations hiding members as it is used all over Dawn
	list(APPEND DAWN_INTERNAL_FLAGS "/wd4458")
	list(APPEND DAWN_INTERNAL_FLAGS "/wd4996") # Allow deprecated functions like strncpy

	list(APPEND DAWN_GENERATED_FLAGS "/wd4702") # Allow unreachable code
	list(APPEND DAWN_GENERATED_FLAGS "/wd4189") # Allow unused variable

	if(DAWN_USE_WERROR)
	list(APPEND DAWN_INTERNAL_FLAGS "/WX")
	endif()
	else()
	# Activate C++14 only on C++ files, not C files.
	list(APPEND DAWN_FLAGS "$<$<COMPILE_LANGUAGE:CXX>:-std=c++14>")
	# enable -Wold-style-cast on C++
	list(APPEND DAWN_FLAGS "$<$<COMPILE_LANGUAGE:CXX>:-Wold-style-cast>")

	list(APPEND DAWN_FLAGS "-fvisibility=hidden" "$<$<COMPILE_LANGUAGE:CXX>:-fno-rtti>" "-fno-exceptions")
	list(APPEND DAWN_FLAGS "-fPIC")

	list(APPEND DAWN_INTERNAL_FLAGS "-Wall" "-Wextra")
	list(APPEND DAWN_INTERNAL_FLAGS "-pedantic")
	list(APPEND DAWN_GENERATED_FLAGS "-Wno-unused-variable" "-Wno-unused-function")

	if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
	# don't break the build on older clang versions
	list(APPEND DAWN_INTERNAL_FLAGS "-Wno-error=unknown-warning-option")
	# GCC's conversion warnings are less useful than clang's
	list(APPEND DAWN_INTERNAL_FLAGS "-Wconversion" "-Wno-sign-conversion")
	# disable a clang-only -pedantic warning
	list(APPEND DAWN_INTERNAL_FLAGS "-Wno-gnu-zero-variadic-macro-arguments")
	# additional potentially useful warnings (feel free to remove if they prove un-useful)
	list(APPEND DAWN_INTERNAL_FLAGS "-Wextra-semi")
	list(APPEND DAWN_INTERNAL_FLAGS "-Wstrict-aliasing")
	list(APPEND DAWN_INTERNAL_FLAGS "-Wunreachable-code")
	list(APPEND DAWN_GENERATED_FLAGS "-Wno-unreachable-code")
	# Probably okay to enable if we establish a field naming convention:
	#list(APPEND DAWN_INTERNAL_FLAGS "-Wshadow")
	endif()
	if(DAWN_USE_WERROR)
	list(APPEND DAWN_INTERNAL_FLAGS "-Werror")
	endif()
	endif()

	function(DawnExternalTarget folder target)
	set_property(TARGET ${target} APPEND PROPERTY COMPILE_OPTIONS ${DAWN_FLAGS})
	set_property(TARGET ${target} APPEND PROPERTY COMPILE_DEFINITIONS ${DAWN_DEFS})
	set_property(TARGET ${target} PROPERTY FOLDER "dawn/${folder}")
	endfunction()

	function(DawnInternalTarget folder target)
	DawnExternalTarget("${folder}" ${target})
	set_property(TARGET ${target} APPEND PROPERTY COMPILE_OPTIONS ${DAWN_INTERNAL_FLAGS})
	set_property(TARGET ${target} APPEND PROPERTY COMPILE_DEFINITIONS ${DAWN_INTERNAL_DEFS})

	# Common include directories shared by all internal targets
	target_include_directories(${target} PRIVATE ${SRC_DIR} ${GENERATED_DIR} ${INCLUDE_DIR})

	# All internal targets require the headers to have been generated
	add_dependencies(${target} dawn_headers)

	# Group the target sources by folder to have folders show in Visual Studio
	if (MSVC)
	get_target_property(targetSources ${target} SOURCES)
	foreach(sourceFile IN ITEMS ${targetSources})
	if (IS_ABSOLUTE "${sourceFile}")
	file(RELATIVE_PATH sourceFile "${CMAKE_CURRENT_SOURCE_DIR}" "${sourceFile}")
	endif()
	get_filename_component(sourceDir "${sourceFile}" PATH)
	string(REPLACE "/" "\\" sourceDir "${sourceDir}")
	source_group("${sourceDir}" FILES "${sourceFile}")
	endforeach()
	endif()
	endfunction()

	# Enable the creation of folders for Visual Studio projects
	set_property(GLOBAL PROPERTY USE_FOLDERS ON)

	# Output shared libs and executables directly in the build directory
	set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
	set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})

	################################################################################
	# Generate the C and C++ Dawn APIs
	################################################################################

	set(INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/src/include)
	set(SRC_DIR ${CMAKE_CURRENT_SOURCE_DIR}/src)

	add_subdirectory(generator)

	# Dawn header generation is in its own target so that it can be set as a build dependency for all
	# internal targets
	Generate(
	LIB_NAME dawn_headers
	LIB_TYPE OBJECT
	FOLDER ""
	PRINT_NAME "Dawn headers"
	COMMAND_LINE_ARGS
	${GENERATOR_COMMON_ARGS}
	-T dawn_headers
	)
	# Older versions of CMake aren't able to know which linker to use without this and fail.
	set_property(TARGET dawn_headers PROPERTY LINKER_LANGUAGE "CXX")

	# libdawn.so/dll/dylib which contains the static proctable C interface and its C++ wrapper
	Generate(
	LIB_NAME libdawn_autogen
	LIB_TYPE OBJECT
	FOLDER "libdawn"
	PRINT_NAME "libdawn"
	COMMAND_LINE_ARGS
	${GENERATOR_COMMON_ARGS}
	-T libdawn
	)
	target_compile_definitions(libdawn_autogen PRIVATE DAWN_IMPLEMENTATION)

	add_library(libdawn SHARED
	$<TARGET_OBJECTS:libdawn_autogen>
	${INCLUDE_DIR}/dawn/dawn_export.h
	${INCLUDE_DIR}/dawn/dawn_wsi.h
	${INCLUDE_DIR}/dawn/EnumClassBitmasks.h
	)
	set_property(TARGET libdawn PROPERTY OUTPUT_NAME "dawn")
	target_include_directories(libdawn PUBLIC ${GENERATED_DIR} ${INCLUDE_DIR})
	DawnInternalTarget("libdawn" libdawn)

	################################################################################
	# Call to other CMakeLists.txt
	################################################################################

	add_subdirectory(third_party)

	add_subdirectory(src/common)
	add_subdirectory(src/dawn_native)
	add_subdirectory(src/dawn_wire)
	add_subdirectory(src/utils)
	add_subdirectory(src/tests)

	add_subdirectory(examples)