Native: support objcExportReportNameCollisions=true binary option

This binary option makes the compiler emit a warning whenever it mangles
a name emitted by ObjCExport.

^KT-63153 Fixed

native/native.tests/testData/compilerOutput/ObjCExportDiagnostics/lib1.kt

@@ -0,0 +1,38 @@
+@file:OptIn(kotlin.experimental.ExperimentalObjCName::class)
+
+package pkg.lib1
+
+interface InterfaceClash
+class ClassClash
+
+interface InterfaceClash2
+class ClassClash2
+
+@ObjCName("InterfaceClash2")
+interface InterfaceClashWithObjCName
+@ObjCName("ClassClash2")
+class ClassClashWithObjCName
+
+class Lib1Kt
+
+enum class E {
+    ONE,
+    one,
+    @ObjCName("one")
+    TWO,
+    ENTRIES,
+    @ObjCName("values") VALUES1;
+}
+
+interface I1 {
+    val prop: Int
+    fun method()
+}
+
+interface I2 {
+    val prop: String
+    fun method()
+}
+
+fun topLevel(arg: Int) {}
+fun topLevel(arg: Long) {}

native/native.tests/testData/compilerOutput/ObjCExportDiagnostics/lib2.kt

@@ -0,0 +1,4 @@
+package pkg.lib2
+
+interface InterfaceClash
+class ClassClash

native/native.tests/testData/compilerOutput/ObjCExportDiagnostics/output.txt

@@ -0,0 +1,25 @@
+warning: name is mangled when generating Objective-C header
+    (at class ClassClashWithObjCName defined in pkg.lib1)
+warning: name is mangled when generating Objective-C header
+    (at enum entry one defined in pkg.lib1.E)
+warning: name is mangled when generating Objective-C header
+    (at enum entry TWO defined in pkg.lib1.E)
+warning: name is mangled when generating Objective-C header
+    (at fun values(): Array<E> defined in pkg.lib1.E)
+warning: name is mangled when generating Objective-C header
+    (at val entries: EnumEntries<E> defined in pkg.lib1.E)
+warning: name is mangled when generating Objective-C header
+    (at val prop: String defined in pkg.lib1.I2)
+warning: name is mangled when generating Objective-C header
+    (at fun `<get-prop>`(): String defined in pkg.lib1.I2)
+warning: name is mangled when generating Objective-C header
+    (at interface InterfaceClashWithObjCName defined in pkg.lib1)
+warning: name is mangled when generating Objective-C header
+    (at class ClassClash defined in pkg.lib2)
+warning: name is mangled when generating Objective-C header
+    (at interface InterfaceClash defined in pkg.lib2)
+warning: name "TOCEDLib1Kt" is mangled when generating Objective-C header
+warning: name "Lib1Kt" is mangled when generating Objective-C header
+warning: name is mangled when generating Objective-C header
+    (at fun topLevel(arg: Long): Unit defined in pkg.lib1)
+OK

native/native.tests/tests/org/jetbrains/kotlin/konan/test/blackbox/CompilerOutputTest.kt

@@ -14,6 +14,7 @@ import org.jetbrains.kotlin.konan.test.blackbox.support.EnforcedProperty
 import org.jetbrains.kotlin.konan.test.blackbox.support.LoggedData
 import org.jetbrains.kotlin.konan.test.blackbox.support.TestCompilerArgs
 import org.jetbrains.kotlin.konan.test.blackbox.support.compilation.LibraryCompilation
+import org.jetbrains.kotlin.konan.test.blackbox.support.compilation.ObjCFrameworkCompilation
 import org.jetbrains.kotlin.konan.test.blackbox.support.compilation.TestCompilationArtifact
 import org.jetbrains.kotlin.konan.test.blackbox.support.compilation.TestCompilationResult
 import org.jetbrains.kotlin.konan.test.blackbox.support.compilation.TestCompilationResult.Companion.assertSuccess
@@ -21,6 +22,7 @@ import org.jetbrains.kotlin.konan.test.blackbox.support.group.FirPipeline
 import org.jetbrains.kotlin.konan.test.blackbox.support.settings.PipelineType
 import org.jetbrains.kotlin.konan.test.blackbox.support.settings.Settings
 import org.jetbrains.kotlin.test.KotlinTestUtils
+import org.junit.jupiter.api.Assumptions
 import org.junit.jupiter.api.Tag
 import org.junit.jupiter.api.Test
 import java.io.File
@@ -79,11 +81,39 @@ abstract class CompilerOutputTestBase : AbstractNativeSimpleTest() {
         KotlinTestUtils.assertEqualsToFile(goldenData, compilationResult.toOutput())
     }
 
+    @Test
+    fun testObjCExportDiagnostics() {
+        Assumptions.assumeTrue(targets.hostTarget.family.isAppleFamily)
+
+        val rootDir = File("native/native.tests/testData/compilerOutput/ObjCExportDiagnostics")
+        val settings = testRunSettings
+        val lib1 = compileLibrary(settings, rootDir.resolve("lib1.kt")).assertSuccess().resultingArtifact
+        val lib2 = compileLibrary(settings, rootDir.resolve("lib2.kt")).assertSuccess().resultingArtifact
+
+        val freeCompilerArgs = TestCompilerArgs(
+            "-Xinclude=${lib1.path}",
+            "-Xinclude=${lib2.path}",
+            "-Xbinary=objcExportReportNameCollisions=true"
+        )
+        val expectedArtifact = TestCompilationArtifact.ObjCFramework(buildDir, "testObjCExportDiagnostics")
+
+        val compilationResult = ObjCFrameworkCompilation(
+            settings,
+            freeCompilerArgs,
+            sourceModules = emptyList(),
+            dependencies = emptyList(),
+            expectedArtifact
+        ).result
+        val goldenData = rootDir.resolve("output.txt")
+
+        KotlinTestUtils.assertEqualsToFile(goldenData, compilationResult.toOutput())
+    }
+
     private fun compileLibrary(
         settings: Settings,
         source: File,
-        freeCompilerArgs: List<String>,
-        dependencies: List<TestCompilationArtifact.KLIB>
+        freeCompilerArgs: List<String> = emptyList(),
+        dependencies: List<TestCompilationArtifact.KLIB> = emptyList(),
     ): TestCompilationResult<out TestCompilationArtifact.KLIB> {
         val testCase = generateTestCaseWithSingleModule(source, TestCompilerArgs(freeCompilerArgs))
         val compilation = LibraryCompilation(