Updating to Xcode 10


John Brownie
 

After a hiatus of some months, I'm back to programming, and just got Xcode 10 installed. When I go to build, I get all kinds of changes suggested. I make some, but then I get stuck some that I cannot work out. My project is a mixture of Objective-C, Objective-C++, C++, and a little Swift (in a separate target).

When I start to build the first target, clang gives the the warning:
warning: include path for stdlibc++ headers not found; pass '-std=libc++' on the command line to use the libc++ standard library instead [-Wstdlibcxx-not-found]

OK, so I add a compiler flag as suggested, and I get the following warnings:
error: invalid value 'libc++' in '-std=libc++'
note: use 'c++98' or 'c++03' for 'ISO C++ 1998 with amendments' standard
note: use 'gnu++98' or 'gnu++03' for 'ISO C++ 1998 with amendments and GNU extensions' standard
note: use 'c++11' for 'ISO C++ 2011 with amendments' standard
note: use 'gnu++11' for 'ISO C++ 2011 with amendments and GNU extensions' standard
note: use 'c++14' for 'ISO C++ 2014 with amendments' standard
note: use 'gnu++14' for 'ISO C++ 2014 with amendments and GNU extensions' standard
note: use 'c++17' for 'ISO C++ 2017 with amendments' standard
note: use 'gnu++17' for 'ISO C++ 2017 with amendments and GNU extensions' standard
note: use 'c++2a' for 'Working draft for ISO C++ 2020' standard
note: use 'gnu++2a' for 'Working draft for ISO C++ 2020 with GNU extensions' standard

Using one of those (c++11), brings me back to the first warning. And then the compiler can't find the standard library headers (e.g. <algorithm>), anyway.

One of the suggested changes was "Update C++ Standard Library", so I reverted to pre-changes and didn't make that change, which got me to the second set of warnings.

Anyone have an idea how to break out of this cycle?

John
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John Brownie
Mussau-Emira language, New Ireland Province, Papua New Guinea
Kouvola, Finland

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