ld：找不到-lstdc++.6 的库

Question

更新 Xcode 版本到 10.0 beta 后开始出现 "ld: library not found for -lstdc++.6" 错误。相同的代码在 Xcode 9.2

中运行良好

还将 macOS 更新到 10.13.5

Answer 1

定位 iOS 应用程序时会遇到此问题。它在发行说明中说明：

Deprecation Notices:

Building with libstdc++ was deprecated with Xcode 8 and is not supported in Xcode 10 when targeting iOS. C++ projects must now migrate to libc++ and are recommended to set a deployment target of iOS 7 or later. Besides changing the C++ Standard Library build setting, developers should audit hard-coded linker flags and target dependencies to remove references to libstdc++ (including -lstdc++, -lstdc++.6.0.9, libstdc++.6.0.9.tbd, and libstdc++.6.0.9.dylib). Project dependencies such as static archives that were built against libstdc++ will also need to be rebuilt against libc++. (40885260)

来源：Release Notes of XCode Beta 2

旁注：
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Link 可能会在下一个测试版中中断（URL 更改），但它在 Developers/Download

部分

XCode 10 正式发布 release note，还是这样:

Building with libstdc++ was deprecated with Xcode 8 and is not supported in Xcode 10 when targeting iOS. C++ projects must now migrate to libc++ and are recommended to set a deployment target of macOS 10.9 or later, or iOS 7 or later. Besides changing the C++ Standard Library build setting, developers should audit hard-coded linker flags and target dependencies to remove references to libstdc++ (including -lstdc++, -lstdc++.6.0.9, libstdc++.6.0.9.tbd, and libstdc++.6.0.9.dylib). Project dependencies such as static archives that were built against libstdc++ will also need to be rebuilt against libc++. (40885260)

Answer 2

如上所述，lstdc++ 已从 Xcode10 中删除。要解决此问题，

转到 Target -> BuildPhases -> Link Binary With Libraries
搜索 lstdc++ 并将其删除。
现在您可能会在使用上述 "lstdc++" 库的某些框架中遇到错误。现在，您要么必须更新这些框架，要么将其删除，以便 Xcode 可以成功构建它。

Answer 3

如果您使用外部 Makefile 构建 C++ 库，请添加

CXXFLAGS += -stdlib=libc++ 您的外部库 Makefile 并删除了 -stdlib=stdlibc++

的实例

如果没有，忽略上面的步骤，直接进入Project>Target>Link Binary with libraries>
- 删除 (-) libstdc++.6.0.9.tbd
- 添加 (+) libc++.tbd

Answer 4

只需转到构建设置，Link 带有库的二进制文件，然后删除 this.It 解决了我的问题。

Answer 5

快速解决方案是将所有 libstdc++.* 文件从旧 Xcode(9.4) 复制到新 Xcode(10.x)

对于设备：

cp /Applications/Xcode9.4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib/libstdc++.* /Applications/Xcode10.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib/

对于模拟器：

cp /Applications/Xcode9.4.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/lib/libstdc++.* /Applications/Xcode10.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/lib/

Answer 6

我在尝试 make install 时失败了。相反，我运行 make install -stdlib=libc++ 成功了。

Answer 7

我试图编译 C 程序并得到 ld: library not found for -lc++

由于提到的弃用以及告诉 C++ 从旧 mac sdk 读取的解决方法 /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk

# adjust your llvm and CLT include paths to match your setup
export CPLUS_INCLUDE_PATH=/usr/local/opt/llvm/include/c++/v1:/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include
# then set correct var for compiler lib
export LIBRARY_PATH=$LIBRARY_PATH:/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/lib

在 fixing-cpp-compilation-bugs-for-the-mac-os-catalina-upgrade

的演练很不错

ld：找不到-lstdc++.6 的库

ld: library not found for -lstdc++.6

macos

xcode

ios

xcode10