Introduce a dummy compiler plugin artifact

KSP now pretends to be a compiler plugin, and gets KotlinCompilation
via KotlinCompilerPluginSupportPlugin, which mandates an non-optional
artifact coordinate.

Author: ting-yuan

gradle-plugin/build.gradle.kts

@@ -143,6 +143,7 @@ tasks.named<Test>("test").configure {
     dependsOn(":api:publishAllPublicationsToTestRepository")
     dependsOn(":common-deps:publishAllPublicationsToTestRepository")
     dependsOn(":gradle-plugin:publishAllPublicationsToTestRepository")
+    dependsOn(":symbol-processing:publishAllPublicationsToTestRepository")
     dependsOn(":symbol-processing-aa-embeddable:publishAllPublicationsToTestRepository")
 }
 

gradle-plugin/src/main/kotlin/com/google/devtools/ksp/gradle/KspSubplugin.kt

@@ -250,6 +250,7 @@ class KspGradleSubplugin @Inject internal constructor(private val registry: Tool
         SubpluginArtifact(
             groupId = "com.google.devtools.ksp",
             artifactId = KSP_COMPILER_PLUGIN_ID,
+            version = KSP_VERSION
         )
 }
 

integration-tests/build.gradle.kts

@@ -34,6 +34,7 @@ fun Test.configureCommonSettings() {
     dependsOn(":api:publishAllPublicationsToTestRepository")
     dependsOn(":gradle-plugin:publishAllPublicationsToTestRepository")
     dependsOn(":common-deps:publishAllPublicationsToTestRepository")
+    dependsOn(":symbol-processing:publishAllPublicationsToTestRepository")
     dependsOn(":symbol-processing-aa-embeddable:publishAllPublicationsToTestRepository")
 }
 

settings.gradle.kts

@@ -22,6 +22,7 @@ include("gradle-plugin")
 include("common-deps")
 include("common-util")
 include("test-utils")
+include("symbol-processing")
 include("integration-tests")
 include("kotlin-analysis-api")
 include("symbol-processing-aa-embeddable")

symbol-processing/build.gradle.kts

@@ -0,0 +1,29 @@
+description = "Dummy Artifact for KotlinCompilerPluginSupportPlugin"
+
+val signingKey: String? by project
+val signingPassword: String? by project
+val kotlinBaseVersion: String by project
+
+plugins {
+    kotlin("jvm")
+    `maven-publish`
+    signing
+}
+
+publishing {
+    publications {
+        create<MavenPublication>("default") {
+            artifactId = "symbol-processing"
+            pom {
+                name.set("com.google.devtools.ksp:symbol-processing")
+                description.set("Symbol processing for Kotlin")
+            }
+        }
+    }
+}
+
+signing {
+    isRequired = hasProperty("signingKey")
+    useInMemoryPgpKeys(signingKey, signingPassword)
+    sign(extensions.getByType<PublishingExtension>().publications)
+}