Create single place in gradle to specify the version of kotlin to use

[JohnLCaron]

https://discuss.kotlinlang.org/t/specifying-the-kotlin-version-in-gradle-multi-project-builds/23838

Adding this to buildSrc/build.gradle.kts:

dependencies {
    implementation("org.jetbrains.kotlin:kotlin-gradle-plugin:1.7.21")
}

gives error:

Build file '/home/snake/dev/github/electionguard-kotlin-multiplatform/egklib/build.gradle.kts' line: 10

Error resolving plugin [id: 'org.jetbrains.kotlin.multiplatform', version: '1.7.21']
> The request for this plugin could not be satisfied because the plugin is already on the classpath with an unknown version, so compatibility cannot be checked.

seems to interfere with the use of dependencyResolutionManagement in settings.gradle.kts

[JohnLCaron]

https://discuss.kotlinlang.org/t/specifying-the-kotlin-version-in-gradle-multi-project-builds/23838

create root level build.gradle.kts::

plugins {
    java
    kotlin("jvm") version "1.7.21" apply false
}

gives error:

org.gradle.internal.exceptions.LocationAwareException: Build file '/home/snake/dev/github/electionguard-kotlin-multiplatform/egklib/build.gradle.kts' line: 10
Error resolving plugin [id: 'org.jetbrains.kotlin.multiplatform', version: '1.7.21']
    at org.gradle.plugin.use.internal.DefaultPluginRequestApplicator.resolveToFoundResult(DefaultPluginRequestApplicator.java:233)

    ... 185 more
Caused by: org.gradle.plugin.management.internal.InvalidPluginRequestException: The request for this plugin could not be satisfied because the plugin is already on the classpath with an unknown version, so compatibility cannot be checked.
    at org.gradle.plugin.use.resolve.internal.AlreadyOnClasspathPluginResolver.resolve(AlreadyOnClasspathPluginResolver.java:84)
    at org.gradle.plugin.use.internal.DefaultPluginRequestApplicator.resolveToFoundResult(DefaultPluginRequestApplicator.java:229)

[JohnLCaron]

Part of the problem may be that is that egklib and hacllib use:

kotlin("multiplatform") version "1.7.21"

but webapps uses

kotlin("jvm") version "1.7.21"

[JohnLCaron]

Would be nice to put

val kotlinVersion by extra("1.7.21") in some common place, then use it like

kotlin("multiplatform") version kotlinVersion

putting it in buildSrc/build.gradle.kts doesnt work putting it in build.gradle.kts doesnt work

[JohnLCaron]

putting

kotlinVersion=1.7.21

into gradle.properties

and then can use

plugins {
    kotlin("multiplatform") version providers.gradleProperty("kotlinVersion").get()
    ...

but only if theres a

buildscript {
    repositories {
    }
}

above the plugins (ok to be empty), otherwise you get

/home/snake/dev/github/electionguard-kotlin-multiplatform/hacllib/build.gradle.kts:3:37: Unresolved reference: providers

The usual gradle "ya just gotta know" bullshit