解决对`LLVMInitializeAArch64TargetInfo‘未定义引用的未定义引用的正确方法是什么？

Question

在Clion中，当我构建llvm项目时，我得到了以下消息：

CMakeFiles/codegen_llvm.dir/main.cpp.o: In function `llvm::InitializeAllTargetInfos()':
/usr/lib/llvm-9/include/llvm/Config/Targets.def:26: undefined reference to `LLVMInitializeAArch64TargetInfo'
/usr/lib/llvm-9/include/llvm/Config/Targets.def:27: undefined reference to `LLVMInitializeAMDGPUTargetInfo'
/usr/lib/llvm-9/include/llvm/Config/Targets.def:28: undefined reference to `LLVMInitializeARMTargetInfo'
/usr/lib/llvm-9/include/llvm/Config/Targets.def:29: undefined reference to `LLVMInitializeBPFTargetInfo'
/usr/lib/llvm-9/include/llvm/Config/Targets.def:30: undefined reference to `LLVMInitializeHexagonTargetInfo'
/usr/lib/llvm-9/include/llvm/Config/Targets.def:31: undefined reference to `LLVMInitializeLanaiTargetInfo'

我的CmakeLists在这里：

cmake_minimum_required(VERSION 3.15)
project(codegen_llvm)
find_package(LLVM REQUIRED CONFIG)

message(STATUS "Found ${LLVM_PACKAGE_VERSION}")
message(STATUS "Using LLVMConfig.cmake in: ${LLVM_DIR}")

include_directories(${LLVM_INCLUDE_DIRS})
add_definitions(${LLVM_DEFINITIONS})

set(CMAKE_CXX_STANDARD 14)

add_executable(codegen_llvm main.cpp)

llvm_map_components_to_libnames(llvm_libs support core irreader executionEngine)
target_link_libraries(codegen_llvm  ${llvm_libs})
...

我该怎么办？

Answer 1

在您的倒数第二行中，config不是一个llvm组件，所以您可能想要删除它。要查看官方组件的列表，请使用llvm-config --components命令。

Answer 2

cmake解决方案

cmake_minimum_required(VERSION 3.10)
project(project_name )

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

set(CMAKE_C_COMPILER clang)
set(CMAKE_CXX_COMPILER clang++)

link_libraries()
execute_process(COMMAND llvm-config --libs OUTPUT_VARIABLE LIBS)
execute_process(COMMAND llvm-config --system-libs OUTPUT_VARIABLE SYS_LIBS)
execute_process(COMMAND llvm-config --ldflags OUTPUT_VARIABLE LDF)
#message(STATUS "Found LLVM" ${LIBS})

string(STRIP ${LIBS} LIBS)
string(STRIP ${SYS_LIBS} SYS_LIBS)
string(STRIP ${LDF} LDF)

link_libraries(${LIBS} ${SYS_LIBS} ${LDF})

execute_process(COMMAND llvm-config --cxxflags OUTPUT_VARIABLE CMAKE_CXX_FLAGS)
string(STRIP ${CMAKE_CXX_FLAGS} CMAKE_CXX_FLAGS)

add_executable(project_name   toy.cpp)

clang++ -g toy.cpp $(llvm-config --cxxflags --ldflags --system-libs --libs) -O3 -o toy

Answer 3

如果您仍然没有针对此错误的解决方案，请尝试将${LLVM_TARGETS_TO_BUILD}添加到链接库。

我也在使用CLion，我通过修改以下代码解决了这个问题：

llvm_map_components_to_libnames(llvm_libs support core irreader codegen mc mcparser option)

至：

llvm_map_components_to_libnames(llvm_libs ${LLVM_TARGETS_TO_BUILD} support core irreader codegen mc mcparser option)