#KT-11916 fixed
To use the IC either:
1. set the `kotlin.compiler.incremental` property to `true` in a pom.xml:
```
<properties>
<kotlin.compiler.incremental>true</kotlin.compiler.incremental>
</properties>
```
2. pass the `kotlin.compiler.incremental` property in a command line:
```
mvn install -Dkotlin.compiler.incremental=true
```
When IC is on Kotlin plugin is expected to print the warning in the log:
```
Using experimental Kotlin incremental compilation
```
After each call an incremental compiler will also log how many files it has compiled:
```
Compiled %SOME_NUMBER% Kotlin files using incremental compiler
```
Note that the first build will be non-incremental.
For more diagnostic information (such as an exact list of compiled files) use the `kotlin.compiler.incremental.log.level` system property:
```
mvn install -Dkotlin.compiler.incremental=true -Dkotlin.compiler.incremental.log.level=info
```
To force the rebuild just run the 'clean' goal:
```
mvn clean install
```
Alexey Tsvetkov
30d6af7aae