CODEWITHSUNDEEP
lldbxcode10swift4.2
asclepix
asclepix

Reputation: 8061

Xcode 10, LLDB: Couldn't IRGen expression

Using Xcode 10, when I stop my app using a breakpoint and try to print the content of an object in the Console, I obtain:

"Couldn't IRGen expression, no additional error"

However, I can see the value of the object in the Variables View panel.

enter image description here

How can I make it evaluate my expression instead?

Upvotes: 15

Views: 4945

Answers (5)

Kamil.S
Kamil.S

Reputation: 5543

In lldb as a workaround you can use:

fr v productVersion
fr v productBuild

since Xcode 10.2

v productVersion
v productBuild

which prints local variable type and address from current call stack frame.

Apple documentation for these kind of lldb capabilities: https://developer.apple.com/library/archive/documentation/General/Conceptual/lldb-guide/chapters/C5-Examining-The-Call-Stack.html

UPDATE: Another trick that seems to help is to set enter image description here

Upvotes: 13

infinity_coding7
infinity_coding7

Reputation: 494

My env: Xcode 11.6 and Xcode 12 Beta 6, carthage 0.34.0

In my case, my company wants me to make build of our app out of Xcode 12 beta and see what's broken. I did it and encounter another bug that crippled the carthage. I fixed it by following this answer in the same thread.

Then I switched back to Xcode 11.6, the error started to appear

error: Couldn't IRGen expression, no additional error

The variable inspector works normally but debug console is useless without print or po. It took me some time to search in SO before I realized this might be related to carthage. Then I updated all my dependencies using the following command

carthage bootstrap --platform iOS --no-use-binaries --cache-builds

Then the debug resume normal and I can use print/po again

Upvotes: 0

Genki
Genki

Reputation: 3195

For my colleague, carthage update --platform iOS --no-use-binaries was working but it was not for me. When I removed the Carthage folder and reran the command, the po command started working 🎉. I'm not sure if it's related but I'm on macOS Catalina 10.15.3 and he is on Mojave. We both have Carthage version 0.34.0.

Upvotes: 0

Vins
Vins

Reputation: 385

I had defined as build system: "Legacy Build System", I changed it to "New Build System", then I build the project, and then I put it back as "Legacy Build System" and it worked again.

For to change the build mode: File->Workspace settings...->Build System

Upvotes: 1

Luigi Marino
Luigi Marino

Reputation: 139

Thanks. I solved with rebuild carthage framework like imtx.me/archives/2719.html

carthage update --platform iOS --no-use-binaries

Upvotes: 8

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