KT-56369: [cinterop] Add gradle integration test on '-fmodules' hint

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/native/CinteropIT.kt

@@ -7,8 +7,9 @@ package org.jetbrains.kotlin.gradle.native
 
 import org.gradle.util.GradleVersion
 import org.jetbrains.kotlin.gradle.testbase.*
+import org.junit.jupiter.api.condition.OS
 
-@MppGradlePluginTests
+@NativeGradlePluginTests
 class CinteropIT : KGPBaseTest() {
 
     @GradleTest
@@ -35,4 +36,21 @@ class CinteropIT : KGPBaseTest() {
             }
         }
     }
+
+    @GradleTest
+    @OsCondition(supportedOn = [OS.MAC], enabledOnCI = [OS.MAC])
+    fun `cinterop gives hint about -fmodules`(gradleVersion: GradleVersion) {
+        nativeProject("cinterop-fmodules", gradleVersion = gradleVersion) {
+            val defFile = projectPath.resolve("native_lib/nlib.def").toFile()
+
+            buildAndFail(":cinteropNlibIosX64") {
+                assertOutputContains("Try adding `-compiler-option -fmodules` to cinterop.")
+            }
+
+            defFile.appendText("\ncompilerOpts = -fmodules")
+            build(":cinteropNlibIosX64") {
+                assertOutputDoesNotContain("Try adding `-compiler-option -fmodules` to cinterop.")
+            }
+        }
+    }
 }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/cinterop-fmodules/build.gradle.kts

@@ -0,0 +1,19 @@
+plugins {
+    kotlin("multiplatform")
+}
+
+repositories {
+    mavenLocal()
+    mavenCentral()
+}
+
+kotlin {
+    iosX64 {
+        compilations.getByName("main") {
+            cinterops.create("nlib") {
+                defFile(file("$projectDir/native_lib/nlib.def"))
+                includeDirs("$projectDir/native_lib")
+            }
+        }
+    }
+}

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/cinterop-fmodules/native_lib/foo.h

@@ -0,0 +1 @@
+@import Bar;

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/cinterop-fmodules/native_lib/module.modulemap

@@ -0,0 +1,6 @@
+module Bar {
+  header "bar.h"
+}
+module Foo {
+  header "foo.h"
+}

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/cinterop-fmodules/native_lib/nlib.def

@@ -0,0 +1,3 @@
+modules = Foo
+package = lib.Foo
+language = Objective-C