Sergey Igushkin
1abcfc76df
When a non-Kotlin (JVM) project resolves an MPP library dependency,
it expects only one variant per Java Usage value ('java-api',
'java-runtime-jars'). If there's more than one, it will report
ambiguity and fail.
So we need to avoid creating non-JVM variants with Java Usage values
to ensure that non-Kotlin consumers can resolve the dependencies on
an MPP library with a single JVM target (if there's more than one
JVM target, there will still be ambiguity, but that's quite what one
would expect and what can be solved with custom attributes).
Instead, we define two Kotlin-specific Usage values, 'kotlin-api' and
'kotlin-runtime', so that:
* input configurations with these Usage values can consume plain Java
artifacts, for compatibility with plain old Kotlin modules
* if a consumer does not request a Kotlin usage and receives the two,
let it use the runtime one as it is more complete
We then use the two Usage values on those Kotlin input and output
configurations which are not JVM-related, and leave the Java Usages
for the JVM targets.
Kotlin Libraries
This part of the project contains the sources of the following libraries:
- kotlin-stdlib, the standard library for Kotlin/JVM, Kotlin/JS and its additional parts for JDK 7 and JDK 8
- kotlin-reflect, the library for full reflection support
- kotlin-test, the library for multiplatform unit testing
- kotlin-annotations-jvm, the annotations to improve types in the Java code to look better when being consumed in the Kotlin code.
These libraries are built as a part of the root Gradle project.
Kotlin Maven Tools
This area of the project is the root for Maven build.
You can work with the maven modules of this maven project in IDEA from the root IDEA project. After importing you'll be able to explore maven projects and run goals directly from IDEA with the instruments on the right sidebar.
Building
You need to install a recent (at least 3.3) Maven distribution.
Before building this Maven project you need to build and install the required artifacts built with Gradle to the local maven repository, by issuing the following command in the root project:
./gradlew install
Note: on Windows type
gradlewwithout the leading./
This command assembles and puts the artifacts to the local maven repository to be used by the subsequent maven build. See also root ReadMe.md, section "Building".
Then you can build maven artifacts with Maven:
mvn install
If your maven build is failing with Out-Of-Memory errors, set JVM options for maven in MAVEN_OPTS environment variable like this:
MAVEN_OPTS="-Xmx2G"