Remove deprecated K/N targets for 1.9.20 (#2325)

See https://kotl.in/native-targets-tiers for details.

Author: projedi

gradle/configure-source-sets.gradle

@@ -102,6 +102,7 @@ kotlin {
         }
     }
 
+    // TODO: Remove deprecated linuxArm32Hfp and mingwX86 targets in 1.9.20.
     def targetsWithoutTestRunners = ["linuxArm32Hfp", "linuxArm64", "mingwX86"]
     configure(targets) {
         // Configure additional binaries to run tests in the background

gradle/native-targets.gradle

@@ -96,6 +96,13 @@ kotlin {
 
     targets {
         if (project.ext.nativeState == NativeState.DISABLED) return
+
+        String[] versionComponents = (~/[.-]/).split(compilerVersion, 4)
+        String[] versionComponents1920 = ["1", "9", "20"]
+        def isAtLeast1920 = Arrays.compare(versionComponents, versionComponents1920) { lhs, rhs ->
+            (lhs as int) <=> (rhs as int)
+        } >= 0
+
         if (project.ext.singleTargetMode) {
             fromPreset(project.ext.ideaPreset, 'native')
         } else {
@@ -131,20 +138,22 @@ kotlin {
 
             addTarget(presets.mingwX64)
 
-            // Deprecated, but were provided by kotlinx.serialization; can be removed only when K/N drops the target
-            addTarget(presets.watchosX86)
+            // Deprecated, but were provided by kotlinx.serialization; can be removed only in 1.9.20 release.
+            if (!isAtLeast1920) {
+                addTarget(presets.watchosX86)
 
-            if (doesNotDependOnOkio(project)) {
-                addTarget(presets.iosArm32)
-                addTarget(presets.linuxArm32Hfp)
-                addTarget(presets.mingwX86)
+                if (doesNotDependOnOkio(project)) {
+                    addTarget(presets.iosArm32)
+                    addTarget(presets.linuxArm32Hfp)
+                    addTarget(presets.mingwX86)
+                }
             }
 
         }
 
         if (project.ext.nativeState == NativeState.HOST) {
             // linux targets that can cross-compile on all three hosts
-            def linuxCrossCompileTargets = [linuxX64, linuxArm32Hfp, linuxArm64]
+            def linuxCrossCompileTargets = isAtLeast1920 ? [presets.linuxX64] : [presets.linuxX64, presets.linuxArm32Hfp, presets.linuxArm64]
             if (getHostName() != "linux") {
                 disableCompilation(linuxCrossCompileTargets)
             }