diff --git a/buildSrc/src/main/kotlin/KotlinConfiguration.kt b/buildSrc/src/main/kotlin/KotlinConfiguration.kt
index 3d9aee1f..1412fe12 100644
--- a/buildSrc/src/main/kotlin/KotlinConfiguration.kt
+++ b/buildSrc/src/main/kotlin/KotlinConfiguration.kt
@@ -1,8 +1,8 @@
 @file:JvmName("KotlinConfiguration")
 
+import org.gradle.api.GradleException
 import org.gradle.api.Project
-import org.gradle.api.artifacts.dsl.RepositoryHandler
-import java.net.URI
+import org.jetbrains.kotlin.gradle.dsl.KotlinCommonCompilerOptions
 import java.util.logging.Logger
 
 /*
@@ -83,3 +83,49 @@ fun getOverridingKotlinApiVersion(project: Project): String? {
  */
 fun irValidationMode(project: Project): String? =
     project.providers.gradleProperty("kotlin_ir_validation_mode").orNull
+
+/**
+ * Unconditional compiler flags required of Kotlin User Projects. See KT-75078.
+ */
+fun KotlinCommonCompilerOptions.addKotlinUserProjectFlags() {
+    freeCompilerArgs.addAll(
+        "-Xreport-all-warnings",
+        "-Xrender-internal-diagnostic-names",
+    )
+}
+
+/**
+ * Use `kotlin_Werror_override` property to override the state of -Werror:
+ * `true` means that warnings should be treated as errors,`false` means that they should not.
+ */
+private fun warningsAreErrorsOverride(project: Project): Boolean? =
+    project.providers.gradleProperty("kotlin_Werror_override").orNull.let {
+        when (it) {
+            "enable" -> true
+            "disable" -> false
+            null -> true
+            else -> throw GradleException("Invalid kotlin_Werror_override value. Use 'enable' or 'disable'")
+        }
+    }
+
+/**
+ * Set warnings as errors but allow the Kotlin User Project configuration to override. See KT-75078.
+ */
+fun KotlinCommonCompilerOptions.setWarningsAsErrors(project: Project) {
+    if (warningsAreErrorsOverride(project) == false) {
+        freeCompilerArgs.addAll("-Wextra", "-Xuse-fir-experimental-checkers")
+    } else {
+        allWarningsAsErrors.set(true)
+    }
+}
+
+/**
+ * Pass additional CLI options to the Kotlin compiler.
+ */
+fun KotlinCommonCompilerOptions.addExtraCompilerFlags(project: Project) {
+    project.providers.gradleProperty("kotlin_additional_cli_options").orNull?.let { options ->
+        options.split(" ").filter { it.isNotBlank() }.forEach {
+            freeCompilerArgs.add(it)
+        }
+    }
+}
\ No newline at end of file
diff --git a/buildSrc/src/main/kotlin/gradle-compatibility.gradle.kts b/buildSrc/src/main/kotlin/gradle-compatibility.gradle.kts
index a6f2d5fc..8546f430 100644
--- a/buildSrc/src/main/kotlin/gradle-compatibility.gradle.kts
+++ b/buildSrc/src/main/kotlin/gradle-compatibility.gradle.kts
@@ -21,7 +21,7 @@ kotlin {
     // Gradle plugin must be compiled targeting the same Kotlin version as used by Gradle
     @Suppress("DEPRECATION", "DEPRECATION_ERROR")
     compilerOptions {
-        allWarningsAsErrors.set(true)
+        setWarningsAsErrors(project)
         freeCompilerArgs.add("-Xsuppress-version-warnings")
 
         languageVersion = getOverridingKotlinLanguageVersion(project)?.let { KotlinVersion.fromVersion(it) }
diff --git a/buildSrc/src/main/kotlin/kotlin-multiplatform-conventions.gradle.kts b/buildSrc/src/main/kotlin/kotlin-multiplatform-conventions.gradle.kts
index b78c8ffd..82dd9019 100644
--- a/buildSrc/src/main/kotlin/kotlin-multiplatform-conventions.gradle.kts
+++ b/buildSrc/src/main/kotlin/kotlin-multiplatform-conventions.gradle.kts
@@ -29,8 +29,17 @@ tasks.withType<KotlinCompile>().configureEach {
 
 tasks.withType<KotlinCompilationTask<*>>().configureEach {
     compilerOptions {
+        addKotlinUserProjectFlags()
+        addExtraCompilerFlags(project)
         irValidationMode(project)?.let {
             freeCompilerArgs.addAll("-Xverify-ir=$it", "-Xverify-ir-visibility")
         }
     }
 }
+
+tasks.withType<KotlinCompilationTask<*>>().configureEach {
+    doFirst {
+        logger.info("Added Kotlin compiler flags: ${compilerOptions.freeCompilerArgs.get().joinToString(", ")}")
+        logger.info("allWarningsAsErrors=${compilerOptions.allWarningsAsErrors.get()}")
+    }
+}