Better checking of ABI compatibility.

Split ${target}CheckAbiCompatibility into two:
1) check${targetName}PlatformAbiCompatibility -- check platform libs compatibility of the given target
2) checkStdlibAbiCompatibility -- check only stdlib.

This approach allows to avoid repeated check of stdlib for each target.

kotlin-native/build-tools/src/main/kotlin/org/jetbrains/kotlin/CompareDistributionSignatures.kt

@@ -12,9 +12,6 @@ import java.io.File
  */
 open class CompareDistributionSignatures : DefaultTask() {
 
-    @Input
-    lateinit var target: String
-
     @Input
     lateinit var oldDistribution: String
 
@@ -31,22 +28,52 @@ open class CompareDistributionSignatures : DefaultTask() {
     @Input
     var onMismatchMode: OnMismatchMode = OnMismatchMode.NOTIFY
 
+    sealed class Libraries {
+        object Standard : Libraries()
+
+        class Platform(val target: String) : Libraries()
+    }
+
+    @Input
+    lateinit var libraries: Libraries
+
+    private fun computeDiff(): KlibDiff = when (val libraries = libraries) {
+        Libraries.Standard -> KlibDiff(
+                emptyList(),
+                emptyList(),
+                listOf(RemainingLibrary(newDistribution.stdlib(), oldDistribution.stdlib()))
+        )
+        is Libraries.Platform -> {
+            val oldPlatformLibs = oldDistribution.platformLibs(libraries.target)
+            val oldPlatformLibsNames = oldPlatformLibs.list().toSet()
+            val newPlatformLibs = newDistribution.platformLibs(libraries.target)
+            val newPlatformLibsNames = newPlatformLibs.list().toSet()
+            KlibDiff(
+                    (newPlatformLibsNames - oldPlatformLibsNames).map(newPlatformLibs::resolve),
+                    (oldPlatformLibsNames - newPlatformLibsNames).map(oldPlatformLibs::resolve),
+                    oldPlatformLibsNames.intersect(newPlatformLibsNames).map {
+                        RemainingLibrary(newPlatformLibs.resolve(it), oldPlatformLibs.resolve(it))
+                    }
+            )
+        }
+    }
+
     @TaskAction
     fun run() {
-        val klibs = getKlibs(oldDistribution, newDistribution)
-        if (klibs.missingLibs.isNotEmpty()) {
+        val platformLibsDiff = computeDiff()
+        if (platformLibsDiff.missingLibs.isNotEmpty()) {
             messageBuilder.apply {
-                appendln("Following libraries are missing in the new distro:")
-                klibs.missingLibs.forEach { appendln(it) }
+                appendln("Following platform libraries are missing in the new distro:")
+                platformLibsDiff.missingLibs.forEach { appendln(it) }
             }
         }
-        if (klibs.newLibs.isNotEmpty()) {
+        if (platformLibsDiff.newLibs.isNotEmpty()) {
             messageBuilder.apply {
-                appendln("Following libraries were added:")
-                klibs.newLibs.forEach { appendln(it) }
+                appendln("Following platform libraries were added:")
+                platformLibsDiff.newLibs.forEach { appendln(it) }
             }
         }
-        for ((new, old) in klibs.remainingLibs) {
+        for ((new, old) in platformLibsDiff.remainingLibs) {
             val result = compareSignatures(new, old)
             if (result.run { newKlibOnly.isNotEmpty() || oldKlibOnly.isNotEmpty() }) {
                 reportMismatch(result, new.name)
@@ -92,19 +119,6 @@ open class CompareDistributionSignatures : DefaultTask() {
     private fun String.platformLibs(target: String): File =
             File("$this/klib/platform/$target")
 
-    private fun getKlibs(oldDistribution: String, newDistribution: String): KlibDiff {
-        val oldPlatformLibs = oldDistribution.platformLibs(target)
-        val oldPlatformLibsNames = oldPlatformLibs.list().toSet()
-        val newPlatformLibs = newDistribution.platformLibs(target)
-        val newPlatformLibsNames = newPlatformLibs.list().toSet()
-        return KlibDiff(
-                (newPlatformLibsNames - oldPlatformLibsNames).map(newPlatformLibs::resolve),
-                (oldPlatformLibsNames - newPlatformLibsNames).map(oldPlatformLibs::resolve),
-                oldPlatformLibsNames.intersect(newPlatformLibsNames).map {
-                    RemainingLibrary(newPlatformLibs.resolve(it), oldPlatformLibs.resolve(it))
-                } + RemainingLibrary(newDistribution.stdlib(), oldDistribution.stdlib())
-        )
-    }
 
     private fun getKlibSignatures(klib: File): List<String> {
         val tool = if (HostManager.hostIsMingw) "klib.bat" else "klib"

kotlin-native/build.gradle

@@ -792,12 +792,20 @@ task compdb(type: Copy) {
 
 if (project.hasProperty("anotherDistro")) {
     targetList.each { targetName ->
-        task "${targetName}CheckAbiCompatibility"(type: CompareDistributionSignatures) {
+        task "${targetName}CheckPlatformAbiCompatibility"(type: CompareDistributionSignatures) {
             dependsOn "${targetName}PlatformLibs"
 
-            target = targetName
+            libraries = new CompareDistributionSignatures.Libraries.Platform(targetName)
             oldDistribution = project.findProperty("anotherDistro")
             onMismatchMode = CompareDistributionSignatures.OnMismatchMode.FAIL
         }
     }
+
+    task "checkStdlibAbiCompatibility"(type: CompareDistributionSignatures) {
+        dependsOn "distRuntime"
+
+        libraries = CompareDistributionSignatures.Libraries.Standard.INSTANCE
+        oldDistribution = project.findProperty("anotherDistro")
+        onMismatchMode = CompareDistributionSignatures.OnMismatchMode.FAIL
+    }
 }