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RocksDB for Erlang

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rocksdb c_src CMake build-snappy.cmake
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c_src/CMake/build-snappy.cmake 

add_dependencies (${ErlangRocksDBNIF_TARGET} snappy)

include(GNUInstallDirs)



set(SNAPPY_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../deps/snappy")

set(SNAPPY_ROOT_DIR "${CMAKE_CURRENT_BINARY_DIR}/snappy")

set(SNAPPY_INCLUDE_DIR "${SNAPPY_ROOT_DIR}/include")

set(SNAPPY_STATIC_LIB "${SNAPPY_ROOT_DIR}/${CMAKE_INSTALL_LIBDIR}/${CMAKE_STATIC_LIBRARY_PREFIX}snappy${CMAKE_STATIC_LIBRARY_SUFFIX}")

set(SNAPPY_LIBRARY ${SNAPPY_STATIC_LIB})



include(ExternalProject)



# Build snappy with RTTI enabled to match RocksDB (which uses USE_RTTI=1)

# Snappy's CMakeLists.txt strips -frtti and adds -fno-rtti to CMAKE_CXX_FLAGS.

# We pass -frtti via CMAKE_CXX_FLAGS_RELEASE which gets appended AFTER base flags,

# so the final order is "... -fno-rtti ... -frtti" and last flag wins with gcc/clang.

if(MSVC)

    set(SNAPPY_RTTI_FLAG "/GR")

else()

    set(SNAPPY_RTTI_FLAG "-frtti")

endif()



ExternalProject_Add(snappy

    SOURCE_DIR "${SNAPPY_SOURCE_DIR}"

    CMAKE_ARGS

        -DCMAKE_INSTALL_PREFIX=${SNAPPY_ROOT_DIR}

        -DCMAKE_POSITION_INDEPENDENT_CODE=ON

        -DCMAKE_POLICY_VERSION_MINIMUM=3.5

        -DCMAKE_BUILD_TYPE=Release

        -DBUILD_SHARED_LIBS=OFF

        -DSNAPPY_BUILD_TESTS=OFF

        -DSNAPPY_BUILD_BENCHMARKS=OFF

        -DCMAKE_CXX_FLAGS_RELEASE=${SNAPPY_RTTI_FLAG}

    BINARY_DIR ${SNAPPY_ROOT_DIR}

    BUILD_BYPRODUCTS "${SNAPPY_STATIC_LIB}"

    )



set(SNAPPY_FOUND TRUE)



message(STATUS "Snappy library: ${SNAPPY_LIBRARY}")

message(STATUS "Snappy includes: ${SNAPPY_INCLUDE_DIR}")



mark_as_advanced(

    SNAPPY_ROOT_DIR

    SNAPPY_LIBRARY

    SNAPPY_INCLUDE_DIR

)