hi, how I can do it right?

# gradle

[lex]

hi, how I can do it right?

[gildor]

arrayOf -> listOf?

[gildor]

Oh, I see, you cannot use += here

[gildor]

just add element using add options.compilerArgs.add("someArg") or something like addAll

[lex]

yes, thnx

[lex]

tasks.withType<JavaCompile> {
options.compilerArgs.addAll(arrayOf("S", generatedPath))
}

[gildor]

I don’t think that Collection has method addAll for array, probably you need listOf instead

[gildor]

oh no

[gildor]

sorry, yes, it has

[gildor]

anyway, I would recommend to use listOf always

[lex]

of course it has

[lex]

why plus assign is not win there?

[lex]

another question, why plus also chosen? 🙂

[lex]

maybe because plusAssign is inline?

[gildor]

Because Kotlin cannot choose between MutableList and Collection operator overloading, because doesn’t know type of this list with platform type. In case of Kotlin List will be created a new list with new content and assigned to variable/field, in case of MutableList new element will be added to an existing list

[lex]

yes, a look at realization. ok, it is just receiver determination problem

[gildor]

and it’s hard to decide what to do without knowing type:
1. Kotlin create a new list from options.compilerArgs (call getCompilerArgs) + your arguments and call setCompilerArgs with a new list as argument
2. Or just call getCompilerArgs and add elements to existing list

[lex]

yes

[gildor]

it’s problem of Gradle API. Maybe make sense to rise an issue, maybe Gradle Team would solve it at least for bundled Gradle plugins

[gildor]

also approach with add, addAll works not for all the apis of Gradle and especially third-party plugins.
Many API return defence copy of list from getter, so you always should check implementation, or use setter, but in this case you can override some default values