[KT-40670] Allow override konan.properties

It is painful to edit konan.properties just to override some value (e.g. compiler flags or LLVM location), especially if it is needed only in a single project. Thus `-Xoverride-konan-properties` is added.

kotlin-native/backend.native/cli.bc/src/org/jetbrains/kotlin/cli/bc/K2Native.kt

@@ -252,6 +252,7 @@ class K2Native : CLICompiler<K2NativeCompilerArguments>() {
                 }
                 put(DISABLE_FAKE_OVERRIDE_VALIDATOR, arguments.disableFakeOverrideValidator)
                 putIfNotNull(PRE_LINK_CACHES, parsePreLinkCachesValue(configuration, arguments.preLinkCaches))
+                putIfNotNull(OVERRIDE_KONAN_PROPERTIES, parseOverrideKonanProperties(arguments, configuration))
             }
         }
     }
@@ -455,6 +456,24 @@ private fun parseDebugPrefixMap(
     }
 }.toMap()
 
+private fun parseOverrideKonanProperties(
+        arguments: K2NativeCompilerArguments,
+        configuration: CompilerConfiguration
+): Map<String, String>? =
+        arguments.overrideKonanProperties?.mapNotNull {
+            val keyValueSeparatorIndex = it.indexOf('=')
+            if (keyValueSeparatorIndex > 0) {
+                it.substringBefore('=') to it.substringAfter('=')
+            } else {
+                configuration.report(
+                        ERROR,
+                        "incorrect property format: expected '<key>=<value>', got '$it'"
+                )
+                null
+            }
+        }?.toMap()
+
+
 
 fun main(args: Array<String>) = K2Native.main(args)
 fun mainNoExitWithGradleRenderer(args: Array<String>) = K2Native.mainNoExitWithGradleRenderer(args)

kotlin-native/backend.native/cli.bc/src/org/jetbrains/kotlin/cli/bc/K2NativeCompilerArguments.kt

@@ -278,6 +278,16 @@ class K2NativeCompilerArguments : CommonCompilerArguments() {
     )
     var preLinkCaches: String? = null
 
+    // We use `;` as delimiter because properties may contain comma-separated values.
+    // For example, target cpu features.
+    @Argument(
+            value = "-Xoverride-konan-properties",
+            valueDescription = "key1=value1;key2=value2;...",
+            description = "Override konan.properties.values",
+            delimiter = ";"
+    )
+    var overrideKonanProperties: Array<String>? = null
+
     override fun configureAnalysisFlags(collector: MessageCollector): MutableMap<AnalysisFlag<*>, Any> =
             super.configureAnalysisFlags(collector).also {
                 val useExperimental = it[AnalysisFlags.useExperimental] as List<*>

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/KonanConfig.kt

@@ -30,7 +30,8 @@ class KonanConfig(val project: Project, val configuration: CompilerConfiguration
     internal val distribution = Distribution(
             configuration.get(KonanConfigKeys.KONAN_HOME) ?: KonanHomeProvider.determineKonanHome(),
             false,
-            configuration.get(KonanConfigKeys.RUNTIME_FILE)
+            configuration.get(KonanConfigKeys.RUNTIME_FILE),
+            configuration.get(KonanConfigKeys.OVERRIDE_KONAN_PROPERTIES)
     )
 
     private val platformManager = PlatformManager(distribution)

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/KonanConfigurationKeys.kt

@@ -144,6 +144,8 @@ class KonanConfigKeys {
                 = CompilerConfigurationKey.create("remap file source paths in debug info")
         val PRE_LINK_CACHES: CompilerConfigurationKey<Boolean>
                 = CompilerConfigurationKey.create("perform compiler caches pre-link")
+        val OVERRIDE_KONAN_PROPERTIES: CompilerConfigurationKey<Map<String, String>>
+                = CompilerConfigurationKey.create("override konan.properties values")
     }
 }