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1a7727a254
A simple HelloWorld program with zero includes except iostream triggers a build of ca. 2000 source files. The reason is that ClickHouse's top-level CMakeLists.txt overrides "add_executable()" to link all binaries against "clickhouse_new_delete". This links against "clickhouse_common_io", which in turn has lots of 3rd party library dependencies ... Without linking "clickhouse_new_delete", the number of compiled files for "HelloWorld" goes down to ca. 70. As an example, the self-extracting-executable needs none of its current dependencies but other programs may also benefit. In order to restore access to the original "add_executable()", the overriding version is now prefixed. There is precedence for a "clickhouse_" prefix (as opposed to "ch_"), for example "clickhouse_split_debug_symbols". In general prefixing makes sense also because overriding CMake commands relies on undocumented behavior and is considered not-so-great practice (*). (*) https://crascit.com/2018/09/14/do-not-redefine-cmake-commands/
33 lines
1.1 KiB
CMake
33 lines
1.1 KiB
CMake
include(${ClickHouse_SOURCE_DIR}/cmake/split_debug_symbols.cmake)
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set (CLICKHOUSE_LIBRARY_BRIDGE_SOURCES
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library-bridge.cpp
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LibraryInterface.cpp
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LibraryBridge.cpp
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Handlers.cpp
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HandlerFactory.cpp
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SharedLibraryHandler.cpp
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SharedLibraryHandlerFactory.cpp
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)
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if (OS_LINUX)
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set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--no-export-dynamic")
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endif ()
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clickhouse_add_executable(clickhouse-library-bridge ${CLICKHOUSE_LIBRARY_BRIDGE_SOURCES})
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target_link_libraries(clickhouse-library-bridge PRIVATE
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daemon
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dbms
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bridge
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)
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set_target_properties(clickhouse-library-bridge PROPERTIES RUNTIME_OUTPUT_DIRECTORY ..)
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if (SPLIT_DEBUG_SYMBOLS)
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clickhouse_split_debug_symbols(TARGET clickhouse-library-bridge DESTINATION_DIR ${CMAKE_CURRENT_BINARY_DIR}/../${SPLITTED_DEBUG_SYMBOLS_DIR} BINARY_PATH ../clickhouse-library-bridge)
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else()
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clickhouse_make_empty_debug_info_for_nfpm(TARGET clickhouse-library-bridge DESTINATION_DIR ${CMAKE_CURRENT_BINARY_DIR}/../${SPLITTED_DEBUG_SYMBOLS_DIR})
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install(TARGETS clickhouse-library-bridge RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT clickhouse)
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endif()
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