From 922fcc4049c116920a4b43b5d4af829b8eaa911f Mon Sep 17 00:00:00 2001
From: Sergey Bogolepov <sergey.bogolepov@jetbrains.com>
Date: Sat, 24 Jul 2021 22:36:41 +0700
Subject: [PATCH] [K/N] Fix windows dynamic tests for LLD

Adjust compilation and linking flags to workaround absence of direct
DLL linkage in LLD.
---
 kotlin-native/backend.native/tests/build.gradle       |  3 +++
 .../kotlin/org/jetbrains/kotlin/KotlinNativeTest.kt   | 11 ++++++++++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/kotlin-native/backend.native/tests/build.gradle b/kotlin-native/backend.native/tests/build.gradle
index 9dc38d77f1e..9b76416ca44 100644
--- a/kotlin-native/backend.native/tests/build.gradle
+++ b/kotlin-native/backend.native/tests/build.gradle
@@ -327,6 +327,9 @@ Task dynamicTest(String name, Closure<KonanDynamicTest> configureClosure) {
                     baseDir  "$testOutputLocal/$name"
                     extraOpts task.flags
                     extraOpts project.globalTestArgs
+                    if (targetName == "mingw_x64" || targetName == "mingw_x86") {
+                        extraOpts "-linker-option", "-Wl,--out-implib,$testOutputLocal/$name/$targetName/${name}.dll.a"
+                    }
                 }
             }
             def buildTask = UtilsKt.findKonanBuildTask(project, name, target)
diff --git a/kotlin-native/build-tools/src/main/kotlin/org/jetbrains/kotlin/KotlinNativeTest.kt b/kotlin-native/build-tools/src/main/kotlin/org/jetbrains/kotlin/KotlinNativeTest.kt
index cc1871299bb..f22aab1d65a 100644
--- a/kotlin-native/build-tools/src/main/kotlin/org/jetbrains/kotlin/KotlinNativeTest.kt
+++ b/kotlin-native/build-tools/src/main/kotlin/org/jetbrains/kotlin/KotlinNativeTest.kt
@@ -17,6 +17,8 @@ import org.gradle.language.base.plugins.LifecycleBasePlugin
 import org.gradle.process.ExecSpec
 import org.jetbrains.kotlin.konan.exec.Command
 import org.jetbrains.kotlin.konan.target.HostManager
+import org.jetbrains.kotlin.konan.target.KonanTarget
+import org.jetbrains.kotlin.konan.target.Family
 import org.jetbrains.kotlin.konan.target.LinkerOutputKind
 import java.io.ByteArrayOutputStream
 import java.io.File
@@ -505,11 +507,18 @@ open class KonanDynamicTest : KonanStandaloneTest() {
         execResult.assertNormalExitValue()
 
         val linker = project.platformManager.platform(project.testTarget).linker
+        val linkerArgs = when (project.testTarget.family) {
+            // rpath is meaningless on Windows (and isn't supported by LLD).
+            // --allow-multiple-definition is needed because finalLinkCommands statically links a lot of MinGW-specific libraries,
+            // that are already included in DLL produced by Kotlin/Native.
+            Family.MINGW -> listOf("-L", artifactsDir, "-Wl,--allow-multiple-definition")
+            else -> listOf("-L", artifactsDir, "-rpath", artifactsDir)
+        }
         val commands = linker.finalLinkCommands(
                 objectFiles = listOf("${this@KonanDynamicTest.executable}.o"),
                 executable = executable,
                 libraries = listOf("-l$name"),
-                linkerArgs = listOf("-L", artifactsDir, "-rpath", artifactsDir),
+                linkerArgs = linkerArgs,
                 optimize = isOpt,
                 debug = isDebug,
                 kind = LinkerOutputKind.EXECUTABLE,