C++：如何将 LLVM 嵌套到你的项目中去

• IDE: Clion
• LLVM

cmake_minimum_required(VERSION 3.9)
project(clang_demo)  

find_package(LLVM REQUIRED CONFIG)  

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

set(CMAKE_CXX_STANDARD 17)  

# Set your project compile flags.
# E.g. if using the C++ header files
# you will need to enable C++11 support
# for your compiler.  

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

add_executable(clang_demo main.cpp)
# Find the libraries that correspond to the LLVM components
# that we wish to use
llvm_map_components_to_libnames(llvm_libs support core irreader)  

# Link against LLVM libraries
target_link_libraries(clang_demo ${llvm_libs})

// main.cpp
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"  

using namespace llvm;  

static std::unique_ptr<LLVMContext> my_Context;
static std::unique_ptr<Module> my_Module;  

static void InitializeModule() {
    my_Context = std::make_unique<LLVMContext>();
    my_Module = std::make_unique<Module>("Hello Modlue", *my_Context);
}  

int main(int argc, char *argv[]) {
    InitializeModule();
    my_Module->print(outs(), nullptr);  

    return 0;
}

不使用 cmake 构建项目，可执行以下命令

clang++ -g mai.cpp `llvm-config --cxxflags --ldflags --system-libs --libs core` -o hello_world

获取 LLVM 配置信息

llvm-config --cxxflags --ldflags --system-libs --libs core