ceph/cmake/modules/BuildZstd.cmake

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# libzstd - build it statically
function(build_Zstd)
set(ZSTD_C_FLAGS "-fPIC -Wno-unused-variable -O3")
include(ExternalProject)
ExternalProject_Add(zstd_ext
SOURCE_DIR ${CMAKE_SOURCE_DIR}/src/zstd/build/cmake
CMAKE_ARGS -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
-DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
-DCMAKE_C_FLAGS=${ZSTD_C_FLAGS}
-DCMAKE_AR=${CMAKE_AR}
-DCMAKE_POSITION_INDEPENDENT_CODE=${ENABLE_SHARED}
BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR}/libzstd
BUILD_COMMAND ${CMAKE_COMMAND} --build <BINARY_DIR> --target libzstd_static
BUILD_BYPRODUCTS "${CMAKE_CURRENT_BINARY_DIR}/libzstd/lib/libzstd.a"
INSTALL_COMMAND "")
add_library(Zstd::Zstd STATIC IMPORTED)
set_target_properties(Zstd::Zstd PROPERTIES
INTERFACE_INCLUDE_DIRECTORIES "${CMAKE_SOURCE_DIR}/src/zstd/lib"
IMPORTED_LOCATION "${CMAKE_CURRENT_BINARY_DIR}/libzstd/lib/libzstd.a")
add_dependencies(Zstd::Zstd zstd_ext)
endfunction()