Xcode 10 (iOS 12) does not contain libstdc++6.0.9

Question

I download the newest Xcode from Apple, but I found I cannot search the library named \"libstdc++6.0.9\".

Answer 1

Jeremy Huddleston Sequoia's answer gave me the direction to resolve this issue. So before going ahead, make sure you have read his answer.

Even after updating the C++ library in your project, you might face a linking error where Xcode is not able to link your project with this libstdc++ lib.

The solution is - if your project structure has libstdc++ included, it might have turned red because Xcode couldn't find the reference for it. If you remove that entry from the project structure and add the new lib instead(libc++), you're good to go.

Answer 2

For simulator, just remove libstdc++.6.0.9.tbd from the Linked Frameworks and Libraries.

Answer 3

Xcode 10 cancels the libstdc++ library with built-in the lib so we should copy the file to the lib by hand.

copy the file: (libstdc++.6.0.9.tbd) and (libstdc++.6.tbd) to :

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib

and

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/lib 

(Please note the distinction "iPhoneOS" and "iPhoneSimulator")

clean xcode and rebuild it.

Here is the file.

Answer 4

Taken from Xcode 10 Beta 2 release notes and applicable to all future versions of Xcode:

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)

Apple will unlikely ever support libstdc++ again.

Answer 5

libstdc++ was deprecated 5 years ago. Apple's more recent platforms (tvOS and watchOS) don't support it.

Support was removed from the iOS 12.0 Simulator runtime, but it remains in the iOS 12.0 (device) runtime for binary compatibility with shipping apps.

You should update your project to use libc++ rather than libstdc++ by setting the CLANG_CXX_LIBRARY build setting ("C++ Standard Library") to libc++.

If you have any static libraries that depend on libstdc++.tbd, you can workaround it for now by copying the file from the SDKs in Xcode 9.4 (and libstdc++.*.dylib in the iOS simulator runtime), but that is not a long term solution. You should contact the provider of those libraries and request versions built using libc++.

Answer 6

You may copy it from old Xcode(9.4). It should work.

cp /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib/libstdc++.* /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib/

cp /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/lib/libstdc++.* /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/lib/