C++ Code Completion Doesn't Work

Question

I have a project with both C++ and ObjC code in Xcode 10 and the C++ code completion doesn't work anymore at all. I get the "No Completions" popup message when there should be suggestions.

This is specific to C++ and Xcode 10 as I can open the same project in Xcode 9 and the code completion works as expected and the ObjC part of the project works too in Xcode 10.

I've tried rebuilds, deleting ~/Library/DerivedData folder, unchecking and checking in Preferences | Text Editor | Code Completion (with accompanied restarts of Xcode) and nothing works.

Ideas of Xcode 10 bug?

Xcode

3.3k

Posted by

spiffyfish

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Answer 1

I filed a bug with Apple and actually got a fix. Problem seems to be their New Build System introduced in Xcode 10. If you set it back to Legacy Build System in File | Project Settings, close your project and reopen it, then it works for me.

I'm not aware of what consequences this might have, but I suspect performance is the reason for the new build system.

Posted by

spiffyfish

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Answer 2

I posted a similar issue with headers not being suggested or autocompleted in C++ with Xcode 10. I'm glad I'm not the only one with issues. Can any others confirm or let us know if there have been bug reports?

Posted by

JosephT++

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Answer 3

I came up with the same problem, and tried to reinstall XCode for serveral times. Is there a way to fix it?

Posted by

LCLx

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Answer 4

I filed a bug with Apple and actually got a fix. Problem seems to be their New Build System introduced in Xcode 10. If you set it back to Legacy Build System in File | Project Settings, close your project and reopen it, then it works for me.

I'm not aware of what consequences this might have, but I suspect performance is the reason for the new build system.

Posted by

spiffyfish

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C++ Code Completion Doesn't Work

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