Add the required OptIn annotations

Author: dkhalanskyjb

core/build.gradle.kts

@@ -118,6 +118,9 @@ kotlin {
         kotlin.srcDir("$targetName/${suffix ?: "src"}")
         resources.srcDir("$targetName/${suffix?.let { it + "Resources" } ?: "resources"}")
         languageSettings {
+            compilerOptions{
+                freeCompilerArgs.add("-Xexpect-actual-classes")
+            }
             //            progressiveMode = true
         }
     }

core/common/src/DayOfWeek.kt

@@ -5,8 +5,6 @@
 
 package kotlinx.datetime
 
-import kotlin.native.concurrent.*
-
 /**
  * The enumeration class representing the days of the week.
  */
@@ -25,8 +23,7 @@ public expect enum class DayOfWeek {
  */
 public val DayOfWeek.isoDayNumber: Int get() = ordinal + 1
 
-@SharedImmutable
-private val allDaysOfWeek = DayOfWeek.values().asList()
+private val allDaysOfWeek = DayOfWeek.entries
 
 /**
  * Returns the [DayOfWeek] instance for the given ISO-8601 week day number. Monday is 1, Sunday is 7.

core/common/src/Month.kt

@@ -5,8 +5,6 @@
 
 package kotlinx.datetime
 
-import kotlin.native.concurrent.*
-
 /**
  * The enumeration class representing the 12 months of the year.
  */
@@ -55,8 +53,7 @@ public expect enum class Month {
  */
 public val Month.number: Int get() = ordinal + 1
 
-@SharedImmutable
-private val allMonths = Month.values().asList()
+private val allMonths = Month.entries
 
 /**
  * Returns the [Month] instance for the given month number. January is 1, December is 12.

core/linux/src/TimeZoneNative.kt

@@ -27,6 +27,7 @@ internal actual class RegionTimeZone(private val tzid: TimeZoneRules, actual ove
             get() = tzdbOnFilesystem.availableTimeZoneIds()
     }
 
+    @OptIn(ExperimentalForeignApi::class)
     actual override fun atStartOfDay(date: LocalDate): Instant = memScoped {
         val ldt = LocalDateTime(date, LocalTime.MIN)
         when (val info = tzid.infoAtDatetime(ldt)) {
@@ -57,15 +58,16 @@ internal actual class RegionTimeZone(private val tzid: TimeZoneRules, actual ove
     actual override fun offsetAtImpl(instant: Instant): UtcOffset = tzid.infoAtInstant(instant)
 }
 
+@OptIn(ExperimentalForeignApi::class)
 internal actual fun currentTime(): Instant = memScoped {
     val tm = alloc<timespec>()
     val error = clock_gettime(CLOCK_REALTIME, tm.ptr)
     if (error != 0) {
         val errorStr: String = strerror(errno)?.toKString() ?: "Unknown error"
         throw IllegalStateException("Could not obtain the current clock readings from the system: $errorStr")
     }
-    val seconds: Long = tm.tv_sec
-    val nanoseconds: Int = tm.tv_nsec.toInt()
+    val seconds: Long = tm.tv_sec.convert<Long>()
+    val nanoseconds: Int = tm.tv_nsec.convert<Int>()
     try {
         require(nanoseconds in 0 until NANOS_PER_ONE)
         return Instant(seconds, nanoseconds)
@@ -74,5 +76,4 @@ internal actual fun currentTime(): Instant = memScoped {
     }
 }
 
-@ThreadLocal
 private val tzdbOnFilesystem = TzdbOnFilesystem(Path.fromString("/usr/share/zoneinfo"))

core/linux/test/TimeZoneRulesCompleteTest.kt

@@ -59,6 +59,7 @@ class TimeZoneRulesCompleteTest {
     }
 }
 
+@OptIn(ExperimentalForeignApi::class)
 private inline fun runUnixCommand(command: String): Sequence<String> = sequence {
     val pipe = popen(command, "r") ?: error("Failed to run command: $command")
     try {

core/nix/src/internal/filesystem.kt

@@ -8,6 +8,7 @@ package kotlinx.datetime.internal
 import kotlinx.cinterop.*
 import platform.posix.*
 
+@OptIn(ExperimentalForeignApi::class)
 internal class Path(val isAbsolute: Boolean, val components: List<String>) {
     fun check(): PathInfo? = memScoped {
         val stat = alloc<stat>()
@@ -58,6 +59,7 @@ internal interface PathInfo {
     val isSymlink: Boolean
 }
 
+@OptIn(ExperimentalForeignApi::class)
 internal fun Path.traverseDirectory(exclude: Set<String> = emptySet(), stripLeadingComponents: Int = this.components.size, actionOnFile: (Path) -> Unit) {
     val handler = opendir(this.toString()) ?: return
     try {
@@ -81,7 +83,7 @@ internal fun Path.traverseDirectory(exclude: Set<String> = emptySet(), stripLead
     }
 }
 
-
+@OptIn(ExperimentalForeignApi::class)
 internal fun Path.readBytes(): ByteArray {
     val handler = fopen(this.toString(), "rb") ?: throw RuntimeException("Cannot open file $this")
     try {
@@ -100,5 +102,6 @@ internal fun Path.readBytes(): ByteArray {
     }
 }
 
+@OptIn(ExperimentalForeignApi::class)
 private val errnoString
     get() = strerror(errno)?.toKString() ?: "Unknown error"