llvm-project/compiler-rt/cmake/Modules/CompilerRTLink.cmake

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include(LLVMParseArguments)
# Link a shared library with COMPILER_RT_TEST_COMPILER.
# clang_link_shared(<output.so>
# OBJECTS <list of input objects>
# LINKFLAGS <list of link flags>
# DEPS <list of dependencies>)
macro(clang_link_shared so_file)
parse_arguments(SOURCE "OBJECTS;LINKFLAGS;DEPS" "" ${ARGN})
if(NOT COMPILER_RT_STANDALONE_BUILD)
list(APPEND SOURCE_DEPS clang)
endif()
add_custom_command(
OUTPUT ${so_file}
COMMAND ${COMPILER_RT_TEST_COMPILER} -o "${so_file}" -shared
${SOURCE_LINKFLAGS} ${SOURCE_OBJECTS}
DEPENDS ${SOURCE_DEPS})
endmacro()