kotlin {
  iosX64('ios') {
    binaries {
      framework()
    }
  }
}

In 1.3.20 when I try to create framework for iOS with above config, looks like link task name is

linkDebugFrameworkIos

, but

kotlin.targets.ios.compilations.main.linkTaskName('FRAMEWORK', 'DEBUG')

is

linkMainDebugFrameworkIos

.

This is correct. Actually they are link tasks of different binaries. As you know, the

compilation.outputKinds

method was used to declare final binaries in 1.3.0. Such an approach allowed creating only one binary for each pair of binary kind (executable, framework etc) and build type (debug/release). So the

compilations.main.linkTaskName('FRAMEWORK', 'DEBUG')

returns the link task name for such a pair. In 1.3.20 the new API allows creating several binaries for the same compilation with the same kind and build type, so it's impossible to get a link task only by a pair of binary kind and build type. But almost all the APIs introduced in 1.3.0 were saved in 1.3.20 to make build scripts compatible. To achieve this, the plugin creates binaries for all kinds listed using the

compilation.outputKinds

method in addition to all binaries declared in the

binaries

block by a user. Thus the

compilation.linkTaskName

returns a link task name of a binary created using the

compilation.outputKinds

method, not a binary declared in the

binaries

block by a user. But you can get a link task of the second binary too:

kotlin {
  iosX64('ios') {
    binaries {
      framework {
        println(linkTask.name)
      }
    }
  }
}

See also:https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html#building-final-native-binaries.