**QUICK FIX**

This is happening because you have multiple versions of Xcode installed. MacOS unfortunately only supports running one version of Xcode at a time, and it needs to know the location of the currently running version. To sort things out, choose one of the following: 

**Quit all instances of Xcode and restart it**

Try one of the other options below if that hasn&#39;t solved it.

**Using the command line:**

1. run   `sudo xcode-select --switch /Applications/your_custom_folder_if_needed/Xcode.app`

2. Restart your terminal and Xcode and it will work just fine.

**No-command line users:**

1. Quit all instances of Xcode
2. Start the instance of Xcode that you want to use
3. Go to Xcode -&gt; Preferences -&gt; Locations
4. Select the correct version in Command Line Tools
5. Done!



It&#39;s due to **multiple Xcode** installed in your system. This is how you make it work:

 1. Quit all running Xcodes
 2. Re-launch Xcode
 3. Go to Xcode &gt; Preferences &gt; Locations
 4. Change to the correct version in `Command Line Tools`

Clean project and clear Derived data if necessary, then run!

In my case quitting and re-launching given Xcode was enough. I had two Xcodes, stable and beta.

For me, restarting the Mac OS worked (multiple times).

My question is whether all integer values are guaranteed to have a perfect double representation. 

Consider the following code sample that prints &quot;Same&quot;:

    // Example program
    #include &lt;iostream&gt;
    #include &lt;string&gt;
    
    int main()
    {
      int a = 3;
      int b = 4;
      double d_a(a);
      double d_b(b);
      
      double int_sum = a + b;
      double d_sum = d_a + d_b;
      
      if (double(int_sum) == d_sum)
      {
          std::cout &lt;&lt; &quot;Same&quot; &lt;&lt; std::endl;
      }
    }

Is this guaranteed to be true for any architecture, any compiler, any values of `a` and `b`? Will any integer `i` converted to `double`, always be represented as `i.0000000000000` and not, for example, as `i.000000000001`?

I tried it for some other numbers and it always was true, but was unable to find anything about whether this is coincidence or by design.


Note: This is different from [this question][1] (aside from the language) since I am adding the two integers. 


  [1]: https://stackoverflow.com/questions/12629087/is-floatinteger-integer-guaranteed-to-be-equal-in-c

Are all integer values perfectly represented as doubles?

I have an existing PHP project with jquery and bootstrap, not using any front-end framework.

I am trying to use webpack module bundler in order to create a single entry point for my project resources, manage js dependencies with node js package manager, run tasks as minify js css, image re-size...etc. And improve the browser loading time required to load a single page.

I came across the webpack tutorials and got to install it and install its dev-server, but the problem is that I am not able to understand how I will convert all my current js scripts and css links in the project (where I have a lot of jquery and CSS libraries used to provide multiple features in the project) to use webpack.

**Do I have to rewrite all my JS and CSS files in a way that suits webpack? How do I make a successful migration?**

**Besides, I am not able to run my current php application on the webpack dev-server, is it meant to run there in the first place? It is only listing the directories of the project in the meantime.**

I have created a test `index.js` file and used the following webpack configuration:

    var path = require(&#39;path&#39;);
    var webpack = require(&#39;webpack&#39;);
    
    module.exports =
    {
        entry: [
            &#39;./public/js/index.js&#39;,
            &#39;webpack/hot/dev-server&#39;,
            &#39;webpack-dev-server/client?http://localhost:8080&#39;
        ],
        plugins: [
          new webpack.HotModuleReplacementPlugin()
        ],
        output: {
            path: path.join(__dirname, &quot;public/dist/js&quot;),
            publicPath : &quot;http://localhost:8080/my_proj/public/dist/js&quot;,
            filename: &quot;bundle.js&quot;
        }
       
    };

I added the `bundle.js` to my script loads just for testing as follows hoping that the application will run on the webpack dev-server:

    &lt;script type=&quot;text/javascript&quot; src=&quot;public/dist/js/bundle.js&quot;&gt;&lt;/script&gt;
    &lt;script type=&quot;text/javascript&quot; src=&quot;public/js/jquery.min.js&quot;&gt;&lt;/script&gt;
    &lt;script type=&quot;text/javascript&quot; src=&quot;public/js/jquery.migrate.js&quot;&gt;&lt;/script&gt;
    &lt;script type=&quot;text/javascript&quot; src=&quot;public/js/jquery.bxslider.min.js&quot;&gt;&lt;/script&gt;
    &lt;script type=&quot;text/javascript&quot; src=&quot;public/js/jquery.appear.js&quot;&gt;&lt;/script&gt;
    &lt;script type=&quot;text/javascript&quot; src=&quot;public/js/jquery.countTo.js&quot;&gt;&lt;/script&gt;
    &lt;script type=&quot;text/javascript&quot; src=&quot;public/js/bootstrap.js&quot;&gt;&lt;/script&gt;

**Please help me understand the concept here and how can I make this migration successfully?**

Using webpack with an existing PHP and JS project

When I try to run my project through the Xcode simulator, it keeps giving me the error &quot;Software caused connection abort&quot;.

Tried restarting the simulator &amp; Xcode, and I recently deleted the DerivedData folder [as suggested in this post about broken playgrounds][1] so that also didn&#39;t help.

  [1]: https://stackoverflow.com/a/43072476/832136

Xcode error connecting to simulator &quot;Software caused connection abort&quot;

<p>When I try to run my project through the Xcode simulator, it keeps giving me the error "Software caused connection abort".</p>
<p>Tried restarting the simulator &#x26; Xcode, and I recently deleted the DerivedData folder <a href="https://stackoverflow.com/a/43072476/832136" target="_blank" rel="noopener noreferrer">as suggested in this post about broken playgrounds</a> so that also didn't help.</p>


I am getting a message in my debugger:

&gt;The LLDB RPC server has crashed. The crash log is located in ~/Library/Logs/DiagnosticReports and has a prefix &#39;lldb-rpc-server&#39;. Please file a bug and attach the most recent crash log.

[![enter image description here][1]][1]


  [1]: https://i.stack.imgur.com/tzzbN.png

What is LLDB RPC Server ? When does it crash in Xcode? Why it crashes?

I am very new to macOS, I just need a mac with Xcode to compile my app. However, with macOS Sierra, I have a problem with my USB that is not working anymore (i can&#39;t plug my ipad pro)

Under OSX el capitan my usb works great, but now the problem is that app store offer me to download the Xcode 8.3 only that can work only on Sierra (strange they offer you to download something not compatible with your system but doesn&#39;t matter, it&#39;s apple). so the only way i have is to download manually the xcode 8.2.1

Now my question, how to install the Xcode_8.2.1.xip I just downloaded? and in near future, if I need to update xcode (I guess downloading myself a new version), how will I do? Also where the preferences and configurations settings are saved? does these preferences will be lost on each update?


How to install Xcode from xip file

I&#39;m following an internet tutorial on Firebase and as part of it, I had to do some work on the command line. I&#39;m pretty comfortable with the command line, but I&#39;m unfamiliar with Cocoapods. I ran `pod repo update` but after doing so I realized I ran it on my entire Documents folder of my Mac instead of the folder that contained my project. I took over 20 mins to execute and it printed out literally thousands of things when it finally completed, some of which included &quot;create&quot; and &quot;deleted&quot;. I was kind of concerned- would run this command have modified anything in my Documents besides the Firebase project? And what does `pod repo update` even do for that matter?

What exactly does `pod repo update` do?

I can&#39;t get rid of this error!

[![][1]][1]


I have tried all sorts of things like clearing Derived Data(Preferences-&gt;Locations-&gt;click gray arrow to open Derived Data folder in Finder-&gt;right-click, move to trash), cleaning the project(CMD+Shift+K or Product-&gt;Clean), updating carthage and dependencies, checked other answers on StackOverflow (mostly adjustments in Build Settings/Phases), and recloned the app from github, etc.

The same project works on my collaborators computers..

EDIT:
From the current top-rated answer, I was able to debug a little further...I am still not sure how to fix though. It looks like I have something in the project twice? I looked and can&#39;t find anything showing up twice!

Here&#39;s a picture of the log:
[![][2]][2]


  [1]: https://i.stack.imgur.com/JwtrU.png
  [2]: https://i.stack.imgur.com/gngDH.png

Linker Command failed with exit code 1 (use -v to see invocation), Xcode 8, Swift 3

When I&#39;m running a unit test and want to debug something, I set a breakpoint and type for instance &quot;po myVariable&quot;. The response I get from LLDB is:

    error: Couldn&#39;t IRGen expression, no additional error



Example:

I have the smallest little unit test defined here:

    class MyExampleTests: XCTestCase {
        func testLLDB() {
            let world = &quot;World&quot;
            print(&quot;Breakpoint goes here&quot;)
            print(&quot;Hello \(world)&quot;)
        }
    }

I set my breakpoint in &quot;Breakpoint goes here&quot;, and when I run, I do &#39;po world&#39;:

    (lldb) po world
    error: Couldn&#39;t IRGen expression, no additional error

Any suggestions to how I can make it evaluate my expression instead?


LLDB: Couldn&#39;t IRGen expression

Running my App in the iPhone X Simulator (GM Seed) I am noticing two strange effects:

- the App does not use the full screen space (top and bottom area is black)
- a strange white bar beneath the title bar

[![enter image description here][1]][1]

Does anybody know what is happening here and how to resolve this? I can&#39;t find any new settings in Interface Builder.


  [1]: https://i.stack.imgur.com/mMMvmm.jpg

Seeing black bars at the top and bottom of the iPhone X Simulator

After updating to Xcode 9, using Swift 3 and the iPhone X simulator, my console is full of:

    TIC Read Status [11:0x0]: 1:57
    TIC Read Status [11:0x0]: 1:57
    TIC Read Status [11:0x0]: 1:57
    ...

What is that and how do I fix it? Help is very appreciated. 

PS: I prefer not to just &quot;silence&quot; it with an `Environment Variable` in the build scheme. 

What is TIC Read Status 1:57 in iOS11/Xcode 9?

I would like to find an easier way to call deep links in the iOS simulator.

On Android you can use ADB to pipe links into the simulator by using the console.  

Is there a similar way or a workaround to open deep links with the latest iOS Simulator?  

Pass deep link into iOS Simulator?

Can someone tell me how can I add files to be used as test files for uploading from the simulator?

I dragged a PDF to the simulator and this is all I get. Can&#39;t really tap the **Add** button.

[![screenshot of the &quot;add item&quot; dialog][1]][1]

  [1]: https://i.stack.imgur.com/zNy9dl.png

How can I add files to the iOS simulator?

I am trying to create a sample application with Flutter (fresh installation). [Android Studio][1] is also installed (fresh installation).

Here is the output of `flutter run`

    flutter run
    No connected devices.

The output of `flutter doctor`:

```lang-none
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel beta, v0.1.5, on Linux, locale en_US.UTF-8)
[✓] Android toolchain - develop for Android devices (Android SDK 27.0.3)
[✓] Android Studio (version 3.0)
[!] VS Code (version 1.20.1)
[!] Connected devices
! No devices available

! Doctor found issues in 2 categories.
```

Is there a solution to this problem?

  [1]: https://en.wikipedia.org/wiki/Android_Studio


Content Type	Original Author	Original Content on Stackoverflow
Question	Hannele	View Question on Stackoverflow
Solution 1 - Xcode	Gabriel Goncalves	View Answer on Stackoverflow
Solution 2 - Xcode	Umit Kaya	View Answer on Stackoverflow
Solution 3 - Xcode	Chuck Boris	View Answer on Stackoverflow
Solution 4 - Xcode	Deepak	View Answer on Stackoverflow

Xcode error connecting to simulator "Software caused connection abort"

Xcode Problem Overview

Xcode Solutions

Solution 1 - Xcode

Solution 2 - Xcode

Solution 3 - Xcode

Solution 4 - Xcode

Using webpack with an existing PHP and JS project

Are all integer values perfectly represented as doubles?

Attributions