编译MLIR Toy Chapter1失败，请求解决链接错误问题

问题背景 #

尝试编译MLIR官方Toy教程Chapter1代码，现有CMake配置如下：

cmake_minimum_required(VERSION 3.20)
project(mlir-toy VERSION 0.0.0)

set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED YES)

find_package(MLIR REQUIRED CONFIG)
list(APPEND CMAKE_MODULE_PATH "${MLIR_CMAKE_DIR}")
list(APPEND CMAKE_MODULE_PATH "${LLVM_CMAKE_DIR}")

include(TableGen)
include(AddLLVM)
include(AddMLIR)
include(HandleLLVMOptions)

set(MLIRTOY_SRC_INCLUDE_DIR ${PROJECT_SOURCE_DIR}/include)

include_directories(${LLVM_INCLUDE_DIRS} ${MLIR_INCLUDE_DIRS} ${MLIRTOY_SRC_INCLUDE_DIR})
add_executable(mlir-toy src/main.cpp src/AST.cpp)
target_link_libraries(mlir-toy PRIVATE MLIRSupport)

编译时触发链接错误：

/usr/bin/ld: CMakeFiles/mlir-toy.dir/src/main.cpp.o:(.data.rel.ro._ZTIN4llvm2cl3optIN12_GLOBAL__N_16ActionELb0ENS0_6parserIS3_EEEE+0x18): undefined reference to `typeinfo for llvm::cl::Option'
/usr/bin/ld: CMakeFiles/mlir-toy.dir/src/main.cpp.o:(.data.rel.ro._ZTIN4llvm2cl6parserIN12_GLOBAL__N_16ActionEEE+0x10): undefined reference to `typeinfo for llvm::cl::generic_parser_base'
/usr/bin/ld: CMakeFiles/mlir-toy.dir/src/main.cpp.o:(.data.rel.ro._ZTIN4llvm2cl15OptionValueCopyIN12_GLOBAL__N_16ActionEEE+0x10): undefined reference to `typeinfo for llvm::cl::GenericOptionValue'
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.

环境信息：

• clang++版本：Ubuntu clang version 17.0.6 (++20231128094036+6009708b4367-1~exp1~20231128094051.72)
• 已自行编译并安装MLIR到本地mlir-toy/install目录

解决方案 #

错误原因是代码使用了LLVM命令行解析组件（llvm::cl），但未链接对应的LLVMSupport库。修改CMakeLists.txt的链接库配置，添加LLVMSupport：

cmake_minimum_required(VERSION 3.20)
project(mlir-toy VERSION 0.0.0)

set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED YES)

find_package(MLIR REQUIRED CONFIG)
list(APPEND CMAKE_MODULE_PATH "${MLIR_CMAKE_DIR}")
list(APPEND CMAKE_MODULE_PATH "${LLVM_CMAKE_DIR}")

include(TableGen)
include(AddLLVM)
include(AddMLIR)
include(HandleLLVMOptions)

set(MLIRTOY_SRC_INCLUDE_DIR ${PROJECT_SOURCE_DIR}/include)

include_directories(${LLVM_INCLUDE_DIRS} ${MLIR_INCLUDE_DIRS} ${MLIRTOY_SRC_INCLUDE_DIR})
add_executable(mlir-toy src/main.cpp src/AST.cpp)
# 补充LLVMSupport库以解决命令行解析相关的链接错误
target_link_libraries(mlir-toy PRIVATE MLIRSupport LLVMSupport)

关键说明 #

• LLVMSupport包含了llvm::cl系列类的实现，缺失该库会导致类型信息和函数符号无法找到。
• 若后续编译还出现其他MLIR组件的链接问题，可参考官方Toy教程的CMake配置，添加对应依赖库（如MLIRIR、MLIRParser等）。

内容的提问来源于stack exchange，提问作者Ustinian