Enable HMPP, declare missing cinterop externals

Since nativeMain sourceSet is now compiled individually, it cannot find declarations provided by cinterop.
Declare them as expect and call external declarations in actuals in each native platform.
Move external declarations to kotlinx.datetime.internal package.

Author: ilya-g

core/build.gradle.kts

@@ -86,6 +86,15 @@ kotlin {
 //        }
     }
 
+    sourceSets.all {
+        kotlin.setSrcDirs(listOf("$name/src"))
+        resources.setSrcDirs(listOf("$name/resources"))
+        languageSettings.apply {
+            //            progressiveMode = true
+            useExperimentalAnnotation("kotlin.Experimental")
+        }
+    }
+
     targets.withType<org.jetbrains.kotlin.gradle.plugin.mpp.KotlinNativeTarget> {
         compilations["main"].cinterops {
             create("date") {
@@ -108,19 +117,14 @@ kotlin {
                 extraOpts("-Xcompile-source", "$cinteropDir/cpp/windows.cpp")
             }
         }
+        compilations["main"].defaultSourceSet {
+            kotlin.srcDir("nativeMain/cinterop_actuals")
+        }
         compilations["test"].kotlinOptions {
             freeCompilerArgs += listOf("-trw")
         }
     }
 
-    sourceSets.all {
-        kotlin.setSrcDirs(listOf("$name/src"))
-        resources.setSrcDirs(listOf("$name/resources"))
-        languageSettings.apply {
-            //            progressiveMode = true
-            useExperimentalAnnotation("kotlin.Experimental")
-        }
-    }
 
     sourceSets {
         commonMain {
@@ -177,10 +181,19 @@ kotlin {
         }
 
         val nativeMain by getting {
+            dependsOn(commonMain.get())
         }
 
         val nativeTest by getting {
         }
+
+//        val mingwX64Main by getting {
+//            kotlin.srcDir("nativeMain/cinterop_actuals")
+//        }
+//
+//        val linuxX64Main by getting {
+//            kotlin.srcDir("nativeMain/cinterop_actuals")
+//        }
     }
 }
 

core/nativeMain/cinterop/date.def

@@ -1,4 +1,4 @@
-package = kotlinx.datetime
+package = kotlinx.datetime.internal
 
 # requirements of the `date` library: https://howardhinnant.github.io/date/tz.html#Installation
 linkerOpts.mingw_x64 = -lole32

core/nativeMain/cinterop_actuals/TimeZoneNative.kt

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2019-2020 JetBrains s.r.o.
+ * Use of this source code is governed by the Apache 2.0 License that can be found in the LICENSE.txt file.
+ */
+package kotlinx.datetime
+
+internal actual fun available_zone_ids(): kotlinx.cinterop.CPointer<kotlinx.cinterop.CPointerVar<kotlinx.cinterop.ByteVar>>? =
+        kotlinx.datetime.internal.available_zone_ids()
+
+internal actual fun get_system_timezone(id: kotlinx.cinterop.CValuesRef<kotlinx.datetime.TZIDVar /* = kotlinx.cinterop.ULongVarOf<kotlin.ULong> */>?): kotlinx.cinterop.CPointer<kotlinx.cinterop.ByteVar /* = kotlinx.cinterop.ByteVarOf<kotlin.Byte> */>? =
+        kotlinx.datetime.internal.get_system_timezone(id)
+
+internal actual fun offset_at_datetime(zone: kotlinx.datetime.TZID /* = kotlin.ULong */, epoch_sec: platform.posix.int64_t /* = kotlin.Long */, offset: kotlinx.cinterop.CValuesRef<kotlinx.cinterop.IntVar /* = kotlinx.cinterop.IntVarOf<kotlin.Int> */>?): kotlin.Int =
+        kotlinx.datetime.internal.offset_at_datetime(zone, epoch_sec, offset)
+
+internal actual fun offset_at_instant(zone: kotlinx.datetime.TZID /* = kotlin.ULong */, epoch_sec: platform.posix.int64_t /* = kotlin.Long */): kotlin.Int =
+        kotlinx.datetime.internal.offset_at_instant(zone, epoch_sec)
+
+internal actual fun timezone_by_name(zone_name: kotlin.String?): kotlinx.datetime.TZID /* = kotlin.ULong */ =
+        kotlinx.datetime.internal.timezone_by_name(zone_name)
+
+internal actual val TZID_INVALID: TZID
+    get() = kotlinx.datetime.internal.TZID_INVALID

core/nativeMain/src/TimeZone.kt

@@ -13,6 +13,16 @@ import kotlinx.cinterop.*
 import platform.posix.*
 import kotlin.native.concurrent.*
 
+
+internal typealias TZIDVar = kotlinx.cinterop.ULongVarOf<kotlinx.datetime.TZID>
+internal typealias TZID = platform.posix.size_t
+internal expect val TZID_INVALID: TZID
+internal expect fun available_zone_ids(): kotlinx.cinterop.CPointer<kotlinx.cinterop.CPointerVar<kotlinx.cinterop.ByteVar>>?
+internal expect fun get_system_timezone(id: kotlinx.cinterop.CValuesRef<kotlinx.datetime.TZIDVar /* = kotlinx.cinterop.ULongVarOf<kotlin.ULong> */>?): kotlinx.cinterop.CPointer<kotlinx.cinterop.ByteVar /* = kotlinx.cinterop.ByteVarOf<kotlin.Byte> */>?
+internal expect fun offset_at_datetime(zone: kotlinx.datetime.TZID /* = kotlin.ULong */, epoch_sec: platform.posix.int64_t /* = kotlin.Long */, offset: kotlinx.cinterop.CValuesRef<kotlinx.cinterop.IntVar /* = kotlinx.cinterop.IntVarOf<kotlin.Int> */>?): kotlin.Int
+internal expect fun offset_at_instant(zone: kotlinx.datetime.TZID /* = kotlin.ULong */, epoch_sec: platform.posix.int64_t /* = kotlin.Long */): kotlin.Int
+internal expect fun timezone_by_name(zone_name: kotlin.String?): kotlinx.datetime.TZID /* = kotlin.ULong */
+
 public actual open class TimeZone internal constructor(private val tzid: TZID, actual val id: String) {
 
     actual companion object {

gradle.properties

@@ -2,8 +2,8 @@ group=org.jetbrains.kotlinx
 version=0.0.1
 versionSuffix=SNAPSHOT
 
-#kotlin.mpp.enableGranularSourceSetsMetadata=true
-#kotlin.mpp.enableCompatibilityMetadataVariant=true
+kotlin.mpp.enableGranularSourceSetsMetadata=true
+kotlin.mpp.enableCompatibilityMetadataVariant=true
 
 # Workaround for Bintray treating .sha512 files as artifacts
 # https://github.com/gradle/gradle/issues/11412