ClickHouse/cmake/linux/default_libs.cmake

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# Set standard, system and compiler libraries explicitly.
# This is intended for more control of what we are linking.
set (DEFAULT_LIBS "-nodefaultlibs")
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# We need builtins from Clang's RT even without libcxx - for ubsan+int128.
# See https://bugs.llvm.org/show_bug.cgi?id=16404
execute_process (COMMAND ${CMAKE_CXX_COMPILER} --target=${CMAKE_CXX_COMPILER_TARGET} --print-libgcc-file-name --rtlib=compiler-rt OUTPUT_VARIABLE BUILTINS_LIBRARY OUTPUT_STRIP_TRAILING_WHITESPACE)
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# Apparently, in clang-19, the UBSan support library for C++ was moved out into ubsan_standalone_cxx.a, so we have to include both.
if (SANITIZE STREQUAL undefined)
string(REPLACE "builtins.a" "ubsan_standalone_cxx.a" EXTRA_BUILTINS_LIBRARY "${BUILTINS_LIBRARY}")
endif ()
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if (NOT EXISTS "${BUILTINS_LIBRARY}")
set (BUILTINS_LIBRARY "-lgcc")
endif ()
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if (OS_ANDROID)
# pthread and rt are included in libc
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set (DEFAULT_LIBS "${DEFAULT_LIBS} ${BUILTINS_LIBRARY} ${EXTRA_BUILTINS_LIBRARY} ${COVERAGE_OPTION} -lc -lm -ldl")
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elseif (USE_MUSL)
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set (DEFAULT_LIBS "${DEFAULT_LIBS} ${BUILTINS_LIBRARY} ${EXTRA_BUILTINS_LIBRARY} ${COVERAGE_OPTION} -static -lc")
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else ()
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set (DEFAULT_LIBS "${DEFAULT_LIBS} ${BUILTINS_LIBRARY} ${EXTRA_BUILTINS_LIBRARY} ${COVERAGE_OPTION} -lc -lm -lrt -lpthread -ldl")
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endif ()
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message(STATUS "Default libraries: ${DEFAULT_LIBS}")
set(CMAKE_CXX_STANDARD_LIBRARIES ${DEFAULT_LIBS})
set(CMAKE_C_STANDARD_LIBRARIES ${DEFAULT_LIBS})
# Unfortunately '-pthread' doesn't work with '-nodefaultlibs'.
# Just make sure we have pthreads at all.
set(THREADS_PREFER_PTHREAD_FLAG ON)
find_package(Threads REQUIRED)
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include (cmake/unwind.cmake)
include (cmake/cxx.cmake)
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if (NOT OS_ANDROID)
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if (NOT USE_MUSL)
# Our compatibility layer doesn't build under Android, many errors in musl.
add_subdirectory(base/glibc-compatibility)
endif ()
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add_subdirectory(base/harmful)
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endif ()
link_libraries(global-group)
target_link_libraries(global-group INTERFACE
-Wl,--start-group
$<TARGET_PROPERTY:global-libs,INTERFACE_LINK_LIBRARIES>
-Wl,--end-group
)