ld：警告：重新导出的库 libunwind.1.dylib 无法与任何父库匹配

Question

我正在尝试在 macOS Sonoma (14.6) 上设置 C++20 开发环境。

我已经使用 Homebrew 安装了

llvm

和

cmake

。

clang

版本信息：

Homebrew clang version 18.1.8
Target: arm64-apple-darwin23.6.0
Thread model: posix
InstalledDir: /opt/homebrew/opt/llvm/bin

~/.zshenv

中的C++配置：

export LDFLAGS="-L/opt/homebrew/opt/llvm/lib"
export CPPFLAGS="-I/opt/homebrew/opt/llvm/include"
export MACOSX_DEPLOYMENT_TARGET=$(sw_vers -productVersion)
path=('/opt/homebrew/opt/llvm/bin' $path)  # --> this is at the bottom of the file

该项目在一个文件中实现和测试，目录结构如下：

.
├── CMakeLists.txt
├── LICENSE.txt
├── Makefile
├── README.md
├── scripts
│   └── build.sh
└── src
    ├── foo
    │    ├── file1.cpp
    │    └── file2.cpp
    └── bar
         ├── file3.cpp
         └── file4.cpp

和

CMakeLists.txt

 看起来像：

cmake_minimum_required(VERSION 3.30)
project(algorithms)

set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

enable_testing()

# Find all source files recursively
file(GLOB_RECURSE SOURCE_FILES "src/**/*.cpp")

# Create executables for each source file
foreach(src_file ${SOURCE_FILES})
    # Extract file name without extension
    get_filename_component(exec_name ${src_file} NAME_WE)

    # Only create executables from files that contain a main function
    if(NOT "${exec_name}" STREQUAL "main")
        add_executable(${exec_name} ${src_file})

        # Register a test for each executable
        add_test(NAME ${exec_name} COMMAND ${exec_name})
    endif()
endforeach()

在执行项目时，我看到以下警告：

ld: warning: reexported library with install name '/opt/homebrew/opt/llvm/lib/libunwind.1.dylib' found at '/opt/homebrew/Cellar/llvm/18.1.8/lib/libunwind.1.0.dylib' couldn't be matched with any parent library and will be linked directly 我尝试注释掉

export LDFLAGS

 中的 

.zshenv

 指令，但仍然看到同样的事情。

如何修复此问题以消除警告？

Answer 1

更新

LDFLAGS

至：

LDFLAGS+=" -L/opt/homebrew/opt/llvm/lib/c++ -L/opt/homebrew/opt/llvm/lib -lunwind" 基于跑步

brew info llvm

。