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

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You’ll have this issue when targeting iOS App. It’s stated in the Release note:

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)

Source: Release Notes of XCode Beta 2

Side Note:

You need to be logged to access the page.
Link might break in next beta release (URLs change), but it’s in the part Developers/Download

XCode 10 being officially released with its release note, it’s still as such:

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)

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