build/cmake/CMakeLists.txt - platform/external/zstd - Git at Google

 # ################################################################
 # Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
 # All rights reserved.
 #
 # This source code is licensed under both the BSD-style license (found in the
 # LICENSE file in the root directory of this source tree) and the GPLv2 (found
 # in the COPYING file in the root directory of this source tree).
 # ################################################################

 cmake_minimum_required(VERSION 2.8.9 FATAL_ERROR)

 # As of 2018-12-26 ZSTD has been validated to build with cmake version 3.13.2 new policies.
 # Set and use the newest cmake policies that are validated to work
 set(ZSTD_MAX_VALIDATED_CMAKE_MAJOR_VERSION "3")
 set(ZSTD_MAX_VALIDATED_CMAKE_MINOR_VERSION "13") #Policies never changed at PATCH level
 if("${CMAKE_MAJOR_VERSION}" LESS 3)
   set(ZSTD_CMAKE_POLICY_VERSION "${CMAKE_VERSION}")
 elseif( "${ZSTD_MAX_VALIDATED_CMAKE_MAJOR_VERSION}" EQUAL "${CMAKE_MAJOR_VERSION}" AND
         "${ZSTD_MAX_VALIDATED_CMAKE_MINOR_VERSION}" GREATER "${CMAKE_MINOR_VERSION}")
     set(ZSTD_CMAKE_POLICY_VERSION "${CMAKE_VERSION}")
 else()
     set(ZSTD_CMAKE_POLICY_VERSION "${ZSTD_MAX_VALIDATED_CMAKE_MAJOR_VERSION}.${ZSTD_MAX_VALIDATED_CMAKE_MINOR_VERSION}.0")
 endif()
 cmake_policy(VERSION ${ZSTD_CMAKE_POLICY_VERSION})

 set(CMAKE_BUILD_WITH_INSTALL_RPATH on)

 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/CMakeModules")
 set(ZSTD_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../..")
 set(LIBRARY_DIR ${ZSTD_SOURCE_DIR}/lib)
 # Parse version
 include(GetZstdLibraryVersion)
 GetZstdLibraryVersion(${LIBRARY_DIR}/zstd.h zstd_VERSION_MAJOR zstd_VERSION_MINOR zstd_VERSION_PATCH)

 if( CMAKE_MAJOR_VERSION LESS 3 )
   ## Provide cmake 3+ behavior for older versions of cmake
   project(zstd)
   set(PROJECT_VERSION_MAJOR ${zstd_VERSION_MAJOR})
   set(PROJECT_VERSION_MINOR ${zstd_VERSION_MINOR})
   set(PROJECT_VERSION_PATCH ${zstd_VERSION_PATCH})
   set(PROJECT_VERSION "${zstd_VERSION_MAJOR}.${zstd_VERSION_MINOR}.${zstd_VERSION_PATCH}")
   enable_language(C)   # Main library is in C
   enable_language(CXX) # Testing contributed code also utilizes CXX
 else()
   project(zstd
     VERSION "${zstd_VERSION_MAJOR}.${zstd_VERSION_MINOR}.${zstd_VERSION_PATCH}"
     LANGUAGES C   # Main library is in C
               CXX # Testing contributed code also utilizes CXX
     )
 endif()
 message(STATUS "ZSTD VERSION: ${zstd_VERSION}")
 set(zstd_HOMEPAGE_URL "http://www.zstd.net")
 set(zstd_DESCRIPTION  "Zstandard is a real-time compression algorithm, providing high compression ratios.")

 # Set a default build type if none was specified
 if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
   message(STATUS "Setting build type to 'Release' as none was specified.")
   set(CMAKE_BUILD_TYPE Release CACHE STRING "Choose the type of build." FORCE)
   # Set the possible values of build type for cmake-gui
   set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug" "Release" "MinSizeRel" "RelWithDebInfo")
 endif()

 include(GNUInstallDirs)

 #-----------------------------------------------------------------------------
 # Add extra compilation flags
 #-----------------------------------------------------------------------------
 include(AddZstdCompilationFlags)
 ADD_ZSTD_COMPILATION_FLAGS()

 # Always hide XXHash symbols
 add_definitions(-DXXH_NAMESPACE=ZSTD_)

 #-----------------------------------------------------------------------------
 # Installation variables
 #-----------------------------------------------------------------------------
 message(STATUS "CMAKE_INSTALL_PREFIX: ${CMAKE_INSTALL_PREFIX}")
 message(STATUS "CMAKE_INSTALL_LIBDIR: ${CMAKE_INSTALL_LIBDIR}")

 #-----------------------------------------------------------------------------
 # Options
 #-----------------------------------------------------------------------------

 # Legacy support
 option(ZSTD_LEGACY_SUPPORT "LEGACY SUPPORT" OFF)

 if (ZSTD_LEGACY_SUPPORT)
     message(STATUS "ZSTD_LEGACY_SUPPORT defined!")
     add_definitions(-DZSTD_LEGACY_SUPPORT=5)
 else ()
     message(STATUS "ZSTD_LEGACY_SUPPORT not defined!")
     add_definitions(-DZSTD_LEGACY_SUPPORT=0)
 endif ()

 # Multi-threading support
 option(ZSTD_MULTITHREAD_SUPPORT "MULTITHREADING SUPPORT" ON)

 if (ZSTD_MULTITHREAD_SUPPORT)
     message(STATUS "ZSTD_MULTITHREAD_SUPPORT is enabled")
 else ()
     message(STATUS "ZSTD_MULTITHREAD_SUPPORT is disabled")
 endif ()

 option(ZSTD_BUILD_PROGRAMS "BUILD PROGRAMS" ON)
 option(ZSTD_BUILD_CONTRIB "BUILD CONTRIB" OFF)

 # Respect the conventional CMake option for enabling tests if it was specified on the first configure
 if (BUILD_TESTING)
     set(ZSTD_BUILD_TESTS_default ON)
 else()
     set(ZSTD_BUILD_TESTS_default OFF)
 endif()
 option(ZSTD_BUILD_TESTS "BUILD TESTS" ${ZSTD_BUILD_TESTS_default})
 if (MSVC)
     option(ZSTD_USE_STATIC_RUNTIME "LINK TO STATIC RUN-TIME LIBRARIES" OFF)
 endif ()

 #-----------------------------------------------------------------------------
 # External dependencies
 #-----------------------------------------------------------------------------
 if (ZSTD_MULTITHREAD_SUPPORT AND UNIX)
     set(THREADS_PREFER_PTHREAD_FLAG ON)
     find_package(Threads REQUIRED)
     if(CMAKE_USE_PTHREADS_INIT)
         set(THREADS_LIBS "${CMAKE_THREAD_LIBS_INIT}")
     else()
         message(SEND_ERROR "ZSTD currently does not support thread libraries other than pthreads")
     endif()
 endif ()

 #-----------------------------------------------------------------------------
 # Add source directories
 #-----------------------------------------------------------------------------
 add_subdirectory(lib)

 option(ZSTD_PROGRAMS_LINK_SHARED "PROGRAMS LINK SHARED" OFF)

 if (ZSTD_BUILD_PROGRAMS)
     if (NOT ZSTD_BUILD_STATIC AND NOT ZSTD_PROGRAMS_LINK_SHARED)
         message(SEND_ERROR "You need to build static library to build zstd CLI")
     elseif(NOT ZSTD_BUILD_SHARED AND ZSTD_PROGRAMS_LINK_SHARED)
         message(SEND_ERROR "You need to build shared library to build zstd CLI")
     endif ()

     add_subdirectory(programs)
 endif ()

 if (ZSTD_BUILD_TESTS)
     enable_testing()
     if (NOT ZSTD_BUILD_STATIC)
         message(SEND_ERROR "You need to build static library to build tests")
     endif ()

     add_subdirectory(tests)
 endif ()

 if (ZSTD_BUILD_CONTRIB)
     add_subdirectory(contrib)
 endif ()

 #-----------------------------------------------------------------------------
 # Add clean-all target
 #-----------------------------------------------------------------------------
 add_custom_target(clean-all
    COMMAND ${CMAKE_BUILD_TOOL} clean
    COMMAND rm -rf ${CMAKE_BINARY_DIR}/
 )

 #-----------------------------------------------------------------------------
 # Generate Package Config files
 #
 # This section is based on the boiler plate code from:
 # https://cmake.org/cmake/help/latest/manual/cmake-packages.7.html#creating-packages
 #-----------------------------------------------------------------------------
 include(CMakePackageConfigHelpers)
 write_basic_package_version_file(
     "${CMAKE_CURRENT_BINARY_DIR}/zstdConfigVersion.cmake"
     VERSION ${zstd_VERSION}
     COMPATIBILITY SameMajorVersion
     )

 # A Package Config file that works from the build directory
 export(EXPORT zstdExports
     FILE "${CMAKE_CURRENT_BINARY_DIR}/zstdTargets.cmake"
     NAMESPACE zstd::
     )
 configure_file(zstdConfig.cmake
     "${CMAKE_CURRENT_BINARY_DIR}/zstdConfig.cmake"
     COPYONLY
     )

 # A Package Config file that works from the installation directory
 set(ConfigPackageLocation ${CMAKE_INSTALL_LIBDIR}/cmake/zstd)
 install(EXPORT zstdExports
     FILE zstdTargets.cmake
     NAMESPACE zstd::
     DESTINATION ${ConfigPackageLocation}
     )
 install(FILES
     zstdConfig.cmake
     "${CMAKE_CURRENT_BINARY_DIR}/zstdConfigVersion.cmake"
     DESTINATION ${ConfigPackageLocation}
     )
	# ################################################################
	# Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
	# All rights reserved.
	#
	# This source code is licensed under both the BSD-style license (found in the
	# LICENSE file in the root directory of this source tree) and the GPLv2 (found
	# in the COPYING file in the root directory of this source tree).
	# ################################################################

	cmake_minimum_required(VERSION 2.8.9 FATAL_ERROR)

	# As of 2018-12-26 ZSTD has been validated to build with cmake version 3.13.2 new policies.
	# Set and use the newest cmake policies that are validated to work
	set(ZSTD_MAX_VALIDATED_CMAKE_MAJOR_VERSION "3")
	set(ZSTD_MAX_VALIDATED_CMAKE_MINOR_VERSION "13") #Policies never changed at PATCH level
	if("${CMAKE_MAJOR_VERSION}" LESS 3)
	set(ZSTD_CMAKE_POLICY_VERSION "${CMAKE_VERSION}")
	elseif( "${ZSTD_MAX_VALIDATED_CMAKE_MAJOR_VERSION}" EQUAL "${CMAKE_MAJOR_VERSION}" AND
	"${ZSTD_MAX_VALIDATED_CMAKE_MINOR_VERSION}" GREATER "${CMAKE_MINOR_VERSION}")
	set(ZSTD_CMAKE_POLICY_VERSION "${CMAKE_VERSION}")
	else()
	set(ZSTD_CMAKE_POLICY_VERSION "${ZSTD_MAX_VALIDATED_CMAKE_MAJOR_VERSION}.${ZSTD_MAX_VALIDATED_CMAKE_MINOR_VERSION}.0")
	endif()
	cmake_policy(VERSION ${ZSTD_CMAKE_POLICY_VERSION})

	set(CMAKE_BUILD_WITH_INSTALL_RPATH on)

	list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/CMakeModules")
	set(ZSTD_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../..")
	set(LIBRARY_DIR ${ZSTD_SOURCE_DIR}/lib)
	# Parse version
	include(GetZstdLibraryVersion)
	GetZstdLibraryVersion(${LIBRARY_DIR}/zstd.h zstd_VERSION_MAJOR zstd_VERSION_MINOR zstd_VERSION_PATCH)

	if( CMAKE_MAJOR_VERSION LESS 3 )
	## Provide cmake 3+ behavior for older versions of cmake
	project(zstd)
	set(PROJECT_VERSION_MAJOR ${zstd_VERSION_MAJOR})
	set(PROJECT_VERSION_MINOR ${zstd_VERSION_MINOR})
	set(PROJECT_VERSION_PATCH ${zstd_VERSION_PATCH})
	set(PROJECT_VERSION "${zstd_VERSION_MAJOR}.${zstd_VERSION_MINOR}.${zstd_VERSION_PATCH}")
	enable_language(C) # Main library is in C
	enable_language(CXX) # Testing contributed code also utilizes CXX
	else()
	project(zstd
	VERSION "${zstd_VERSION_MAJOR}.${zstd_VERSION_MINOR}.${zstd_VERSION_PATCH}"
	LANGUAGES C # Main library is in C
	CXX # Testing contributed code also utilizes CXX
	)
	endif()
	message(STATUS "ZSTD VERSION: ${zstd_VERSION}")
	set(zstd_HOMEPAGE_URL "http://www.zstd.net")
	set(zstd_DESCRIPTION "Zstandard is a real-time compression algorithm, providing high compression ratios.")

	# Set a default build type if none was specified
	if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
	message(STATUS "Setting build type to 'Release' as none was specified.")
	set(CMAKE_BUILD_TYPE Release CACHE STRING "Choose the type of build." FORCE)
	# Set the possible values of build type for cmake-gui
	set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug" "Release" "MinSizeRel" "RelWithDebInfo")
	endif()

	include(GNUInstallDirs)

	#-----------------------------------------------------------------------------
	# Add extra compilation flags
	#-----------------------------------------------------------------------------
	include(AddZstdCompilationFlags)
	ADD_ZSTD_COMPILATION_FLAGS()

	# Always hide XXHash symbols
	add_definitions(-DXXH_NAMESPACE=ZSTD_)

	#-----------------------------------------------------------------------------
	# Installation variables
	#-----------------------------------------------------------------------------
	message(STATUS "CMAKE_INSTALL_PREFIX: ${CMAKE_INSTALL_PREFIX}")
	message(STATUS "CMAKE_INSTALL_LIBDIR: ${CMAKE_INSTALL_LIBDIR}")

	#-----------------------------------------------------------------------------
	# Options
	#-----------------------------------------------------------------------------

	# Legacy support
	option(ZSTD_LEGACY_SUPPORT "LEGACY SUPPORT" OFF)

	if (ZSTD_LEGACY_SUPPORT)
	message(STATUS "ZSTD_LEGACY_SUPPORT defined!")
	add_definitions(-DZSTD_LEGACY_SUPPORT=5)
	else ()
	message(STATUS "ZSTD_LEGACY_SUPPORT not defined!")
	add_definitions(-DZSTD_LEGACY_SUPPORT=0)
	endif ()

	# Multi-threading support
	option(ZSTD_MULTITHREAD_SUPPORT "MULTITHREADING SUPPORT" ON)

	if (ZSTD_MULTITHREAD_SUPPORT)
	message(STATUS "ZSTD_MULTITHREAD_SUPPORT is enabled")
	else ()
	message(STATUS "ZSTD_MULTITHREAD_SUPPORT is disabled")
	endif ()

	option(ZSTD_BUILD_PROGRAMS "BUILD PROGRAMS" ON)
	option(ZSTD_BUILD_CONTRIB "BUILD CONTRIB" OFF)

	# Respect the conventional CMake option for enabling tests if it was specified on the first configure
	if (BUILD_TESTING)
	set(ZSTD_BUILD_TESTS_default ON)
	else()
	set(ZSTD_BUILD_TESTS_default OFF)
	endif()
	option(ZSTD_BUILD_TESTS "BUILD TESTS" ${ZSTD_BUILD_TESTS_default})
	if (MSVC)
	option(ZSTD_USE_STATIC_RUNTIME "LINK TO STATIC RUN-TIME LIBRARIES" OFF)
	endif ()

	#-----------------------------------------------------------------------------
	# External dependencies
	#-----------------------------------------------------------------------------
	if (ZSTD_MULTITHREAD_SUPPORT AND UNIX)
	set(THREADS_PREFER_PTHREAD_FLAG ON)
	find_package(Threads REQUIRED)
	if(CMAKE_USE_PTHREADS_INIT)
	set(THREADS_LIBS "${CMAKE_THREAD_LIBS_INIT}")
	else()
	message(SEND_ERROR "ZSTD currently does not support thread libraries other than pthreads")
	endif()
	endif ()

	#-----------------------------------------------------------------------------
	# Add source directories
	#-----------------------------------------------------------------------------
	add_subdirectory(lib)

	option(ZSTD_PROGRAMS_LINK_SHARED "PROGRAMS LINK SHARED" OFF)

	if (ZSTD_BUILD_PROGRAMS)
	if (NOT ZSTD_BUILD_STATIC AND NOT ZSTD_PROGRAMS_LINK_SHARED)
	message(SEND_ERROR "You need to build static library to build zstd CLI")
	elseif(NOT ZSTD_BUILD_SHARED AND ZSTD_PROGRAMS_LINK_SHARED)
	message(SEND_ERROR "You need to build shared library to build zstd CLI")
	endif ()

	add_subdirectory(programs)
	endif ()

	if (ZSTD_BUILD_TESTS)
	enable_testing()
	if (NOT ZSTD_BUILD_STATIC)
	message(SEND_ERROR "You need to build static library to build tests")
	endif ()

	add_subdirectory(tests)
	endif ()

	if (ZSTD_BUILD_CONTRIB)
	add_subdirectory(contrib)
	endif ()

	#-----------------------------------------------------------------------------
	# Add clean-all target
	#-----------------------------------------------------------------------------
	add_custom_target(clean-all
	COMMAND ${CMAKE_BUILD_TOOL} clean
	COMMAND rm -rf ${CMAKE_BINARY_DIR}/
	)

	#-----------------------------------------------------------------------------
	# Generate Package Config files
	#
	# This section is based on the boiler plate code from:
	# https://cmake.org/cmake/help/latest/manual/cmake-packages.7.html#creating-packages
	#-----------------------------------------------------------------------------
	include(CMakePackageConfigHelpers)
	write_basic_package_version_file(
	"${CMAKE_CURRENT_BINARY_DIR}/zstdConfigVersion.cmake"
	VERSION ${zstd_VERSION}
	COMPATIBILITY SameMajorVersion
	)

	# A Package Config file that works from the build directory
	export(EXPORT zstdExports
	FILE "${CMAKE_CURRENT_BINARY_DIR}/zstdTargets.cmake"
	NAMESPACE zstd::
	)
	configure_file(zstdConfig.cmake
	"${CMAKE_CURRENT_BINARY_DIR}/zstdConfig.cmake"
	COPYONLY
	)

	# A Package Config file that works from the installation directory
	set(ConfigPackageLocation ${CMAKE_INSTALL_LIBDIR}/cmake/zstd)
	install(EXPORT zstdExports
	FILE zstdTargets.cmake
	NAMESPACE zstd::
	DESTINATION ${ConfigPackageLocation}
	)
	install(FILES
	zstdConfig.cmake
	"${CMAKE_CURRENT_BINARY_DIR}/zstdConfigVersion.cmake"
	DESTINATION ${ConfigPackageLocation}
	)