FAQ - Kotlin 官方参考文档中文版 - 扣丁书屋

A: Define a top level function fun main(args: Array<String>) or just fun main() if you are not interested
in passed arguments, please ensure it's not in a package.
Also compiler switch -entry could be used to make any function taking Array<String> or no arguments
and return Unit as an entry point.

Q: What is Kotlin/Native memory management model?

A: Kotlin/Native provides an automated memory management scheme, similar to what Java or Swift provides.
The current implementation includes an automated reference counter with a cycle collector to collect cyclical
garbage.

Q: How do I create a shared library?

A: Use the -produce dynamic compiler switch, or compilations.main.outputKinds 'DYNAMIC' in Gradle, i.e.

targets {
    fromPreset(presets.iosArm64, 'mylib') {
       compilations.main.outputKinds 'DYNAMIC'
    }
}

It will produce a platform-specific shared object (.so on Linux, .dylib on macOS, and .dll on Windows targets) and a
C language header, allowing the use of all public APIs available in your Kotlin/Native program from C/C++ code.
See samples/python_extension for an example of using such a shared object to provide a bridge between Python and
Kotlin/Native.

Q: How do I create a static library or an object file?

A: Use the -produce static compiler switch, or compilations.main.outputKinds 'STATIC' in Gradle, i.e.

targets {
    fromPreset(presets.iosArm64, 'mylib') {
       compilations.main.outputKinds 'STATIC'
    }
}

It will produce a platform-specific static object (.a library format) and a C language header, allowing you to
use all the public APIs available in your Kotlin/Native program from C/C++ code.

Q: How do I run Kotlin/Native behind a corporate proxy?

A: As Kotlin/Native needs to download a platform specific toolchain, you need to specify
-Dhttp.proxyHost=xxx -Dhttp.proxyPort=xxx as the compiler's or gradlew arguments,
or set it via the JAVA_OPTS environment variable.

Q: How do I specify a custom Objective-C prefix/name for my Kotlin framework?

A: Use the -module_name compiler option or matching Gradle DSL statement, i.e.

```groovy targets { fromPreset(presets.iosArm64, 'myapp') { compilations.main.outputKinds 'FRAMEWORK' compilations.main.extraOpts '-module_name', 'TheName' } } ```

Q: How do I enable bitcode for my Kotlin framework?

A: Use either -Xembed-bitcode or -Xembed-bitcode-marker compiler option
or matching Gradle DSL statement, i.e.

```groovy targets { fromPreset(presets.iosArm64, 'myapp') { compilations.main.outputKinds 'FRAMEWORK' compilations.main.extraOpts '-Xembed-bitcode' // for release binaries // or '-Xembed-bitcode-marker' for debug binaries } ``` These options have nearly the same effect as clang's `-fembed-bitcode`/`-fembed-bitcode-marker` and swiftc's `-embed-bitcode`/`-embed-bitcode-marker`.

Q: Why do I see `InvalidMutabilityException`?

A: It likely happens, because you are trying to mutate a frozen object. An object can transfer to the
frozen state either explicitly, as objects reachable from objects on which the kotlin.native.concurrent.freeze is called,
or implicitly (i.e. reachable from enum or global singleton object - see the next question).

Q: How do I make a singleton object mutable?

A: Currently, singleton objects are immutable (i.e. frozen after creation), and it's generally considered
good practise to have the global state immutable. If for some reason you need a mutable state inside such an
object, use the @konan.ThreadLocal annotation on the object. Also the kotlin.native.concurrent.AtomicReference class could be
used to store different pointers to frozen objects in a frozen object and automatically update them.

Q: How can I compile my project against the Kotlin/Native master?

A: We release dev builds frequently, usually at least once a week. You can check the list of available versions. But if we recently fixed an issue and you want to check it before a release is done, you can do:

For the CLI, you can compile using gradle as stated in the README (and if you get errors, you can try to do a ./gradlew clean):

```bash ./gradlew dependencies:update ./gradlew dist distPlatformLibs ```

You can then set the `KONAN_HOME` env variable to the generated `dist` folder in the git repository.

For Gradle, you can use Gradle composite builds like this:

```bash # Set with the path of your kotlin-native clone export KONAN_REPO=$PWD/../kotlin-native # Run this once since it is costly, you can remove the `clean` task if not big changes were made from the last time you did this pushd $KONAN_REPO && git pull && ./gradlew clean dependencies:update dist distPlatformLibs && popd # In your project, you set have to the konan.home property, and include as composite the shared and gradle-plugin builds ./gradlew check -Pkonan.home=$KONAN_REPO/dist --include-build $KONAN_REPO/shared --include-build $KONAN_REPO/tools/kotlin-native-gradle-plugin ```

Kotlin 官方参考文档 中文版

Q: How do I run my program?