mill.scalalib.GenIdea/idea needs to include scala-library compiler-classpath.

[htmldoug]

For https://github.com/lihaoyi/upickle/ (7d22de9 at time of writing), mill mill.scalalib.GenIdea/idea generates a definition of .idea/libraries/scala_library_2_11_12_jar.xml that does not include the compiler-classpath necessary for IntelliJ to be able to build the project. Attempting to run/build in IntelliJ project produces Error:scalac: No 'scala-compiler*.jar' in Scala compiler classpath in Scala SDK scala-library-2.11.12.jar.

The mill generated value of .idea/libraries/scala_library_2_11_12_jar.xml is:

<component name="libraryTable">
  <library name="scala-library-2.11.12.jar" type="Scala">
    <CLASSES>
      <root url="jar://$USER_HOME$/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.11.12/scala-library-2.11.12.jar!/" />
    </CLASSES>
    <JAVADOC />
    <SOURCES>
      <root url="jar://$USER_HOME$/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.11.12/scala-library-2.11.12-sources.jar!/" />
    </SOURCES>
  </library>
</component>

IntelliJ builds work after manually adding libs to the compiler classpath:

<component name="libraryTable">
  <library name="scala-library-2.11.12.jar" type="Scala">
    <properties>
      <compiler-classpath>
        <root url="file://$USER_HOME$/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-compiler/2.11.12/scala-compiler-2.11.12.jar" />
        <root url="file://$USER_HOME$/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.11.12/scala-library-2.11.12.jar" />
        <root url="file://$USER_HOME$/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/modules/scala-xml_2.11/1.0.5/scala-xml_2.11-1.0.5.jar" />
        <root url="file://$USER_HOME$/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/modules/scala-parser-combinators_2.11/1.0.4/scala-parser-combinators_2.11-1.0.4.jar" />
        <root url="file://$USER_HOME$/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-reflect/2.11.12/scala-reflect-2.11.12.jar" />
      </compiler-classpath>
    </properties>
    <CLASSES>
      <root url="jar://$USER_HOME$/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.11.12/scala-library-2.11.12.jar!/" />
    </CLASSES>
    <JAVADOC />
    <SOURCES>
      <root url="jar://$USER_HOME$/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.11.12/scala-library-2.11.12-sources.jar!/" />
    </SOURCES>
  </library>
</component>

Seems like mill mill.scalalib.GenIdea/idea should be modified to generate the compiler-classpath elements.

[tekumara]

I also experienced this. Thanks for the fix above.

[kascakm]

This was a blocker for our experimental project. Switched back to sbt.