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mark_as_advanced(ZSTD_INCLUDE_DIR ZSTD_LIBRARY)
if(DEPS STREQUAL "DOWNLOAD" OR DEP_ZSTD STREQUAL "DOWNLOAD")
message(STATUS "Downloading Zstd as requested")
set(_download_zstd TRUE)
else()
find_path(ZSTD_INCLUDE_DIR zstd.h)
find_library(ZSTD_LIBRARY zstd)
if(ZSTD_INCLUDE_DIR AND ZSTD_LIBRARY)
file(READ "${ZSTD_INCLUDE_DIR}/zstd.h" _zstd_h)
string(REGEX MATCH "#define ZSTD_VERSION_MAJOR +([0-9]+).*#define ZSTD_VERSION_MINOR +([0-9]+).*#define ZSTD_VERSION_RELEASE +([0-9]+)" _ "${_zstd_h}")
set(_zstd_version_string "${CMAKE_MATCH_1}.${CMAKE_MATCH_2}.${CMAKE_MATCH_3}")
if(NOT "${CMAKE_MATCH_0}" STREQUAL "" AND "${_zstd_version_string}" VERSION_GREATER_EQUAL "${Zstd_FIND_VERSION}")
message(STATUS "Using system Zstd (${ZSTD_LIBRARY})")
set(_zstd_origin "SYSTEM (${ZSTD_LIBRARY})")
add_library(dep_zstd UNKNOWN IMPORTED)
set_target_properties(
dep_zstd
PROPERTIES
INTERFACE_INCLUDE_DIRECTORIES "${ZSTD_INCLUDE_DIR}"
IMPORTED_LOCATION "${ZSTD_LIBRARY}"
)
endif()
endif()
if(NOT _zstd_origin)
if(DEPS STREQUAL "AUTO")
message(STATUS "Downloading Zstd from the internet since Zstd>=${Zstd_FIND_VERSION} was not found locally and DEPS=AUTO")
set(_download_zstd TRUE)
else()
message(FATAL_ERROR "Could not find Zstd>=${Zstd_FIND_VERSION}")
endif()
endif()
endif()
if(_download_zstd)
set(_zstd_version_string 1.5.7)
set(ZSTD_BUILD_PROGRAMS OFF)
set(ZSTD_BUILD_SHARED OFF)
set(ZSTD_BUILD_STATIC ON)
set(ZSTD_BUILD_TESTS OFF)
include(FetchContent)
FetchContent_Declare(
Zstd
URL "https://github.com/facebook/zstd/releases/download/v${_zstd_version_string}/zstd-${_zstd_version_string}.tar.gz"
URL_HASH SHA256=eb33e51f49a15e023950cd7825ca74a4a2b43db8354825ac24fc1b7ee09e6fa3
SOURCE_SUBDIR build/cmake
EXCLUDE_FROM_ALL # CMake 3.28+
)
set(_saved_BUILD_SHARED_LIBS ${BUILD_SHARED_LIBS})
set(BUILD_SHARED_LIBS OFF) # avoid warning from zstd's CMake scripts.
if(CMAKE_VERSION VERSION_LESS "3.28")
FetchContent_GetProperties(zstd)
if(NOT zstd_POPULATED)
FetchContent_Populate(Zstd)
add_subdirectory("${zstd_SOURCE_DIR}/build/cmake" "${zstd_BINARY_DIR}" EXCLUDE_FROM_ALL)
endif()
else()
FetchContent_MakeAvailable(Zstd)
endif()
set(BUILD_SHARED_LIBS ${_saved_BUILD_SHARED_LIBS})
unset(_saved_BUILD_SHARED_LIBS)
unset(ZSTD_BUILD_PROGRAMS)
unset(ZSTD_BUILD_SHARED)
unset(ZSTD_BUILD_STATIC)
unset(ZSTD_BUILD_TESTS)
set(_zstd_origin DOWNLOADED)
add_library(dep_zstd ALIAS libzstd_static)
endif()
register_dependency(Zstd "${_zstd_origin}" "${_zstd_version_string}")
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