Kotlin Multiplatform library for iOS with bitcode

Question

we use Kotlin to share a library between Android and iOS.

We set up everything, but on iOS i need Bitcode enabled. After a research I found solution:

kotlin {
targets {
    fromPreset(presets.jvm, 'jvm') {
        mavenPublication {
            artifactId = 'my-lib-name'
        }
    }
    // Switch here to presets.iosArm64 to build library for iPhone device || iosX64 for emulator
    fromPreset(presets.iosArm64, 'iOS') {
        compilations.main.outputKinds('FRAMEWORK')
        compilations.main.extraOpts '-Xembed-bitcode' // for release binaries
        compilations.main.extraOpts '-Xembed-bitcode-marker'//  for debug binaries
    }
  }
}

But the question is now, do I have and if yes, how do I separate between release and debug binaries and the specific flags? Can i simply add both flags without any drawbacks?

Maybe somebody can enlighten me thanks

Ilya Matveev · Accepted Answer · 2019-01-24 05:21:45Z

10

Since Kotlin 1.3.20 bitcode embedding for iOS frameworks works out of the box. You also can configure embedding manually if you need:

kotlin {
    iosArm64("ios") {
        binaries {
            framework {
                // The following embedding modes are available:
                //   - "marker"  - Embed placeholder LLVM IR data as a marker.
                //                 Has the same effect as '-Xembed-bitcode-marker.'
                //   - "bitcode" - Embed LLVM IR bitcode as data.
                //                 Has the same effect as the '-Xembed-bitcode'.
                //   - "disable" - Don't embed LLVM IR bitcode.
                embedBitcode("marker")
            }
        }
    }
}

answered Jan 24, 2019 at 5:21

Ilya Matveev

1914 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Pavel Over a year ago

How can I disable bitcode generation using groovy in 1.3.20?

hotkey · Accepted Answer · 2018-11-28 20:57:03Z

5

Currently, all of the binary link tasks for the same iOS target share the compiler and linker options, so there's no way to setup the options for them separately. Please follow KT-26887 for updates.

If you can afford running several builds with different options, you can set the options conditionally and run the build with a flag:

compilations.main.outputKinds('FRAMEWORK')

if (project.findProperty("releaseFramework") == "true")
    compilations.main.extraOpts '-Xembed-bitcode' // for release binaries
else
    compilations.main.extraOpts '-Xembed-bitcode-marker'//  for debug binaries

Then run the build with or without the flag, respectively:

./gradlew linkDebugFrameworkIOS

and

./gradlew linkReleaseFrameworkIOS -PreleaseFramework=true

edited Nov 28, 2018 at 20:57

answered Nov 28, 2018 at 20:48

hotkey

149k43 gold badges392 silver badges333 bronze badges

Comments

Niklas · Accepted Answer · 2020-01-16 20:15:34Z

0

I only want to use Bitcode when it's actually needed. Xcode passes down an environment variable ENABLE_BITCODE which we can use to conditionally embed bitcode.

kotlin {
  iosArm64("ios") {
    binaries {
      framework {
        embedBitcode("YES".equals(System.getenv("ENABLE_BITCODE")) ? "bitcode" : "marker")
      }
    }
  }
}

answered Jan 16, 2020 at 20:15

Niklas

25.7k36 gold badges139 silver badges185 bronze badges

3 Comments

JP Illanes Over a year ago

This is not completely correct, Xcode will set ENABLE_BITCODE for both debug and release builds, you should use bitcode only for release builds as it will slow down your compilation process, and mark for debug builds. If ENABLE_BITCODE is false (or not there) you should use disable, instead.

JP Illanes Over a year ago

You can use the env var CONFIGURATION to know if is a debug or release build.

JP Illanes Over a year ago

(By default there are 2 possible values for CONFIGURATION, "Debug" or "Release" but you can add more through Xcode, so check your project config...)

Collectives™ on Stack Overflow

Kotlin Multiplatform library for iOS with bitcode

3 Answers 3

1 Comment

Comments

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related