[Gradle] Support suppressing KGP diagnostics

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/PropertiesProvider.kt

@@ -530,6 +530,12 @@ internal class PropertiesProvider private constructor(private val project: Proje
     val internalVerboseDiagnostics: Boolean
         get() = booleanProperty(KOTLIN_INTERNAL_VERBOSE_DIAGNOSTICS) ?: false
 
+    val suppressedGradlePluginWarnings: List<String>
+        get() = property(PropertyNames.KOTLIN_SUPPRESS_GRADLE_PLUGIN_WARNINGS)?.split(",").orEmpty()
+
+    val suppressedGradlePluginErrors: List<String>
+        get() = property(PropertyNames.KOTLIN_SUPPRESS_GRADLE_PLUGIN_ERRORS)?.split(",").orEmpty()
+
     /**
      * Retrieves a comma-separated list of browsers to use when running karma tests for [target]
      * @see KOTLIN_JS_KARMA_BROWSERS
@@ -620,6 +626,8 @@ internal class PropertiesProvider private constructor(private val project: Proje
         const val KOTLIN_MPP_ALLOW_LEGACY_DEPENDENCIES = "kotlin.mpp.allow.legacy.dependencies"
         const val KOTLIN_EXPERIMENTAL_TRY_K2 = "kotlin.experimental.tryK2"
         const val KOTLIN_INTERNAL_VERBOSE_DIAGNOSTICS = "kotlin.internal.verboseDiagnostics"
+        const val KOTLIN_SUPPRESS_GRADLE_PLUGIN_WARNINGS = "kotlin.suppressGradlePluginWarnings"
+        const val KOTLIN_SUPPRESS_GRADLE_PLUGIN_ERRORS = "kotlin.internal.suppressGradlePluginErrors"
     }
 
     companion object {

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/diagnostics/KotlinToolingDiagnosticsCollector.kt

@@ -9,6 +9,9 @@ import org.gradle.api.InvalidUserCodeException
 import org.gradle.api.Project
 import org.gradle.api.services.BuildService
 import org.gradle.api.services.BuildServiceParameters
+import org.jetbrains.kotlin.gradle.plugin.PropertiesProvider.Companion.kotlinPropertiesProvider
+import org.jetbrains.kotlin.gradle.plugin.diagnostics.ToolingDiagnostic.Severity.ERROR
+import org.jetbrains.kotlin.gradle.plugin.diagnostics.ToolingDiagnostic.Severity.WARNING
 import org.jetbrains.kotlin.gradle.utils.registerClassLoaderScopedBuildService
 import java.util.*
 import java.util.concurrent.ConcurrentHashMap
@@ -17,11 +20,20 @@ private typealias ToolingDiagnosticId = String
 private typealias GradleProjectPath = String
 
 internal abstract class KotlinToolingDiagnosticsCollector : BuildService<BuildServiceParameters.None> {
-    private val diagnosticsFromProject: MutableMap<GradleProjectPath, MutableList<ToolingDiagnostic>> = ConcurrentHashMap()
+    private val rawDiagnosticsFromProject: MutableMap<GradleProjectPath, MutableList<ToolingDiagnostic>> = ConcurrentHashMap()
     private val reportedIds: MutableSet<ToolingDiagnosticId> = Collections.newSetFromMap(ConcurrentHashMap())
 
-    fun getDiagnosticsForProject(project: Project): Collection<ToolingDiagnostic> = diagnosticsFromProject[project.path].orEmpty()
+    fun getDiagnosticsForProject(project: Project): Collection<ToolingDiagnostic> {
-    fun getAllDiagnostics(): Collection<ToolingDiagnostic> = diagnosticsFromProject.values.flatten()
+        val rawDiagnostics = rawDiagnosticsFromProject[project.path] ?: return emptyList()
+
+        val suppressedWarnings = project.kotlinPropertiesProvider.suppressedGradlePluginWarnings.toSet()
+        val suppressedErrors = project.kotlinPropertiesProvider.suppressedGradlePluginErrors.toSet()
+
+        fun ToolingDiagnostic.isSuppressed(): Boolean =
+            severity == WARNING && id in suppressedWarnings || severity == ERROR && id in suppressedErrors
+
+        return rawDiagnostics.filter { !it.isSuppressed() }
+    }
 
     fun report(project: Project, diagnostic: ToolingDiagnostic) {
         saveDiagnostic(project, diagnostic)
@@ -43,7 +55,7 @@ internal abstract class KotlinToolingDiagnosticsCollector : BuildService<BuildSe
         if (diagnostic.severity == ToolingDiagnostic.Severity.FATAL) {
             throw InvalidUserCodeException(diagnostic.message)
         }
-        diagnosticsFromProject.compute(project.path) { _, previousListIfAny ->
+        rawDiagnosticsFromProject.compute(project.path) { _, previousListIfAny ->
             previousListIfAny?.apply { add(diagnostic) } ?: mutableListOf(diagnostic)
         }
     }

libraries/tools/kotlin-gradle-plugin/src/functionalTest/kotlin/org/jetbrains/kotlin/gradle/diagnosticsTests/DiagnosticsReportingFunctionalTest.kt

@@ -7,6 +7,7 @@ package org.jetbrains.kotlin.gradle.diagnosticsTests
 
 import org.gradle.api.Project
 import org.gradle.api.internal.project.ProjectInternal
+import org.jetbrains.kotlin.gradle.plugin.PropertiesProvider
 import org.jetbrains.kotlin.gradle.plugin.diagnostics.*
 import org.jetbrains.kotlin.gradle.util.applyKotlinJvmPlugin
 import org.jetbrains.kotlin.gradle.util.buildProject
@@ -15,6 +16,7 @@ import org.jetbrains.kotlin.gradle.plugin.diagnostics.ToolingDiagnostic
 import org.jetbrains.kotlin.gradle.plugin.diagnostics.ToolingDiagnostic.Severity
 import org.jetbrains.kotlin.gradle.plugin.diagnostics.ToolingDiagnostic.Severity.ERROR
 import org.jetbrains.kotlin.gradle.plugin.diagnostics.ToolingDiagnostic.Severity.WARNING
+import org.jetbrains.kotlin.gradle.plugin.extraProperties
 import org.junit.Test
 
 class DiagnosticsReportingFunctionalTest {
@@ -112,6 +114,39 @@ class DiagnosticsReportingFunctionalTest {
 
         root.checkDiagnostics("oncePerProjectAndOncePerBuildAreEquivalentForRoot")
     }
+
+    @Test
+    fun testSuppressedWarnings() {
+        buildProject().run {
+            applyKotlinJvmPlugin()
+            extraProperties.set(PropertiesProvider.PropertyNames.KOTLIN_SUPPRESS_GRADLE_PLUGIN_WARNINGS, "TEST_DIAGNOSTIC")
+            reportTestDiagnostic()
+            evaluate()
+            checkDiagnostics("suppressedWarnings")
+        }
+    }
+
+    @Test
+    fun testSuppressedErrors() {
+        buildProject().run {
+            applyKotlinJvmPlugin()
+            extraProperties.set(PropertiesProvider.PropertyNames.KOTLIN_SUPPRESS_GRADLE_PLUGIN_ERRORS, "TEST_DIAGNOSTIC")
+            reportTestDiagnostic(severity = ERROR)
+            evaluate()
+            checkDiagnostics("suppressedErrors")
+        }
+    }
+
+    @Test
+    fun testSuppressForWarningsDoesntWorkForErrors() {
+        buildProject().run {
+            applyKotlinJvmPlugin()
+            extraProperties.set(PropertiesProvider.PropertyNames.KOTLIN_SUPPRESS_GRADLE_PLUGIN_WARNINGS, "TEST_DIAGNOSTIC")
+            reportTestDiagnostic(severity = ERROR)
+            evaluate()
+            checkDiagnostics("suppressForWarningsDoesntWorkForErrors")
+        }
+    }
 }
 
 private fun buildProjectWithMockedCheckers(

libraries/tools/kotlin-gradle-plugin/src/functionalTest/kotlin/org/jetbrains/kotlin/gradle/unitTests/KotlinMultiplatformAndroidGradlePluginCompatibilityHealthCheckTest.kt

@@ -316,7 +316,7 @@ class KotlinMultiplatformAndroidGradlePluginCompatibilityHealthCheckTest {
     }
 
     private fun Project.assertNoWarningMessage() {
-        val diagnostics = kotlinToolingDiagnosticsCollector.getAllDiagnostics()
+        val diagnostics = kotlinToolingDiagnosticsCollector.getDiagnosticsForProject(this)
         if (diagnostics.isNotEmpty()) {
             fail("Expected no warning messages to be emitted. Found: $diagnostics")
         }

libraries/tools/kotlin-gradle-plugin/src/functionalTest/resources/expectedDiagnostics/suppressForWarningsDoesntWorkForErrors.txt

@@ -0,0 +1,3 @@
+[TEST_DIAGNOSTIC | ERROR] This is a test diagnostic
+
+It has multiple lines of text