# Content/Chapter Requests Here

**URL:** <https://forums.kodeco.com/t/content-chapter-requests-here/36481>\
**Category:** Advanced Apple Debugging\
**Created:** [November 11, 2017, 3:18pm UTC](https://forums.kodeco.com/t/content-chapter-requests-here/36481 "2017-11-11T15:18:28Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![lolgrep](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/lolgrep/32/106950_2.png) [@lolgrep](https://forums.kodeco.com/u/lolgrep)\
**Post date:** [November 11, 2017, 3:18pm UTC](https://forums.kodeco.com/t/content-chapter-requests-here/36481/1 "2017-11-11T15:18:28Z")

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Hey all,

I am starting a post for any content you want in upcoming versions of the dbg book. For example, @tomn has requested a chapter on Instruments as well as how to best utilize ASL. I can’t guarantee I’ll get to all of them, but I’ll definitely consider each one.

Cheers!

~Derek

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**Author:** ![tomn](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/tomn/32/81494_2.png) [@tomn](https://forums.kodeco.com/u/tomn)\
**Post date:** [November 11, 2017, 3:45pm UTC](https://forums.kodeco.com/t/content-chapter-requests-here/36481/2 "2017-11-11T15:45:07Z")

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@lolgrep Thanks! 🙂 Maybe not ASL, as it is somehow deprecated right now, but more like: “What are the best ways to use Apple Unified Logging and Activity Tracing”. Here is an unfortunately very general article: [https://artandlogic.com/2016/07/smarter-debugging-unified-logging-activity-tracing/](https://artandlogic.com/2016/07/smarter-debugging-unified-logging-activity-tracing/)

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**Author:** ![lolgrep](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/lolgrep/32/106950_2.png) [@lolgrep](https://forums.kodeco.com/u/lolgrep)\
**Post date:** [November 13, 2017, 4:10pm UTC](https://forums.kodeco.com/t/content-chapter-requests-here/36481/3 "2017-11-13T16:10:15Z")

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ahhh dang it, thanks for the correction @tomn; muscle memory 😃

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**Author:** ![wneumann](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/wneumann/32/81494_2.png) [@wneumann](https://forums.kodeco.com/u/wneumann)\
**Post date:** [January 9, 2018, 1:57pm UTC](https://forums.kodeco.com/t/content-chapter-requests-here/36481/4 "2018-01-09T13:57:57Z")

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Not so much a content request, but a note you may want to add to the book. In chapter 1, right as we try to evaluate our first Swift expression I got the following baffling response to trying to import Foundation.

```
(lldb) ex -l swift -- import Foundation
warning: Swift error in module Xcode.
Debug info from this module will be unavailable in the debugger.

warning: Swift error in module dyld.
Debug info from this module will be unavailable in the debugger.

warning: Swift error in module Cocoa.
Debug info from this module will be unavailable in the debugger.

warning: Swift error in module DVTFoundation.
Debug info from this module will be unavailable in the debugger.

warning: Swift error in module DVTKit.
Debug info from this module will be unavailable in the debugger.

warning: Swift error in module IDEFoundation.
Debug info from this module will be unavailable in the debugger.

warning: Swift error in module IDEKit.
Debug info from this module will be unavailable in the debugger.

warning: Swift error in module Foundation.
Debug info from this module will be unavailable in the debugger.

warning: Swift error in module libobjc.A.dylib.
Debug info from this module will be unavailable in the debugger.

warning: Swift error in module libSystem.B.dylib.
Debug info from this module will be unavailable in the debugger.

warning: Swift error in module AppKit.
Debug info from this module will be unavailable in the debugger.

…

```

It does this for a total of 1146 modules before finishing with:

```
Shared Swift state for Xcode could not be initialized.
The REPL and expressions are unavailable.

```

Any further attempts at evaluating swift expressions fail with the bit about shared Swift state not being initialized and the REPL being unavailable.

After some hair pulling and Google massaging, I finally found out that the culprit behind this was that I installed the command line tools _before_ installing Xcode (it was a fresh install of High Sierra in a VM and I installed Homebrew before I installed Xcode). Because of this Xcode had no location set for the command-line tools. I had to go into Xcode \> Preferences \> Locations to set it.

This probably won’t be an issue for most people, but it may still be worth a footnote in the book.

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**Author:** ![system](https://s3.amazonaws.com/cdn.raywenderlich.com/community/forum-assets/noun-game-ghost-878668.png) [@system](https://forums.kodeco.com/u/system)\
**Post date:** [April 27, 2018, 7:18am UTC](https://forums.kodeco.com/t/content-chapter-requests-here/36481/5 "2018-04-27T07:18:30Z")

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