[Build] Configure API/language version 1.7 for Gradle plugins

Also fixes part of deprecation warnings so that project sync passes.
The rest is disabled to be fixed in the next commits
Note that even though we could use language version 1.8, it's preferrable to have it exactly the same as the bundled compiler for Gradle Kotlin scripts for more reliable compatibility.
^KT-72329 In Progress

Author: ALikhachev

compiler/util-klib/src/org/jetbrains/kotlin/library/encodings/WobblyTF8.kt

@@ -29,11 +29,11 @@ object WobblyTF8 {
             if (char1 < '\u0080') {
                 // U+0000..U+007F -> 0xxxxxxx
                 // 7 meaningful bits -> 1 byte
-                buffer[writtenBytes++] = char1.toInt()
+                buffer[writtenBytes++] = char1.code
             } else if (char1 < '\u0800') {
                 // U+0080..U+07FF -> 110xxxxx 10xxxxxx
                 // 11 meaningful bits -> 2 bytes
-                val codePoint = char1.toInt()
+                val codePoint = char1.code
                 buffer[writtenBytes++] = (codePoint ushr 6) or 0b1100_0000
                 buffer[writtenBytes++] = (codePoint and 0b0011_1111) or 0b1000_0000
             } else {
@@ -55,7 +55,7 @@ object WobblyTF8 {
 
                 // U+0800..U+FFFF -> 1110xxxx 10xxxxxx 10xxxxxx
                 // 16 meaningful bits -> 3 bytes
-                val codePoint = char1.toInt()
+                val codePoint = char1.code
                 buffer[writtenBytes++] = (codePoint ushr 12) or 0b1110_0000
                 buffer[writtenBytes++] = ((codePoint ushr 6) and 0b0011_1111) or 0b1000_0000
                 buffer[writtenBytes++] = (codePoint and 0b0011_1111) or 0b1000_0000

gradle.properties

@@ -90,7 +90,7 @@ kotlin.build.internal.gradle.setup=true
 #kotlin.build.useFirForLibraries=true
 
 # Disable -Werror compiler flag
-#kotlin.build.disable.werror=true
+kotlin.build.disable.werror=true
 
 # Render internal diagostic names
 #kotlin.build.render.diagnostic.names=true

libraries/tools/kotlin-gradle-plugin-idea/build.gradle.kts

@@ -9,16 +9,7 @@ plugins {
     id("org.jetbrains.kotlinx.binary-compatibility-validator")
 }
 
-@Suppress("DEPRECATION", "DEPRECATION_ERROR")
-tasks.withType<KotlinCompilationTask<*>>().configureEach {
-    compilerOptions {
-        apiVersion.value(KotlinVersion.KOTLIN_1_5).finalizeValueOnRead()
-        languageVersion.value(KotlinVersion.KOTLIN_1_5).finalizeValueOnRead()
-        freeCompilerArgs.add("-Xsuppress-version-warnings")
-    }
-}
-
-configureRunViaKotlinBuildToolsApi()
+configureKotlinCompileTasksGradleCompatibility()
 
 kotlin.sourceSets.configureEach {
     languageSettings.optIn("org.jetbrains.kotlin.gradle.InternalKotlinGradlePluginApi")

libraries/tools/kotlin-gradle-plugin/build.gradle.kts

@@ -339,9 +339,9 @@ tasks {
             /*
              * This excludes .kotlin_module files for compiler modules from the fat jars.
              * These files are required only at compilation time, but we include the modules only for runtime
-             * Hack for not limiting LV to 1.5 for those modules. To be removed after KT-70247
+             * Hack for not limiting LV to 1.7 for those modules. To be removed after KT-70247
              */
-            pivotVersion = KotlinMetadataPivotVersion(1, 6, 0)
+            pivotVersion = KotlinMetadataPivotVersion(1, 8, 0)
         }
         asmDeprecation {
             val exclusions = listOf(

native/utils/src/org/jetbrains/kotlin/konan/target/utils.kt

@@ -5,6 +5,8 @@
 
 package org.jetbrains.kotlin.konan.target
 
+import java.util.Locale
+
 /**
  * Name of a preset used in the 'kotlin-multiplatform' Gradle plugin to represent this target.
  */
@@ -21,3 +23,5 @@ private fun evaluatePresetName(targetName: String): String {
     val nameParts = targetName.split('_').mapNotNull { it.takeIf(String::isNotEmpty) }
     return nameParts.asSequence().drop(1).joinToString("", nameParts.firstOrNull().orEmpty()) { it.capitalize() }
 }
+
+private fun String.capitalize(): String = replaceFirstChar { if (it.isLowerCase()) it.titlecase(Locale.getDefault()) else it.toString() }

native/utils/src/org/jetbrains/kotlin/konan/util/VisibleNamed.kt

@@ -5,7 +5,7 @@
 
 package org.jetbrains.kotlin.konan.util
 
-val <T : Enum<T>> T.visibleName get() = name.toLowerCase()
+val <T : Enum<T>> T.visibleName get() = name.lowercase()
 
 interface Named {
     val name: String

repo/gradle-build-conventions/buildsrc-compat/src/main/kotlin/GradleCommon.kt

@@ -545,10 +545,10 @@ fun Project.configureKotlinCompileTasksGradleCompatibility() {
         compilerOptions {
             if (!kotlinBuildProperties.isInJpsBuildIdeaSync) {
                 // check https://docs.gradle.org/current/userguide/compatibility.html#kotlin for Kotlin-Gradle versions matrix
-                @Suppress("DEPRECATION", "DEPRECATION_ERROR") // we can't use language version greater than 1.5 as minimal supported Gradle embeds Kotlin 1.4
-                languageVersion.set(KotlinVersion.KOTLIN_1_5)
-                @Suppress("DEPRECATION", "DEPRECATION_ERROR") // we can't use api version greater than 1.4 as minimal supported Gradle version uses kotlin-stdlib 1.4
-                apiVersion.set(KotlinVersion.KOTLIN_1_4)
+                @Suppress("DEPRECATION", "DEPRECATION_ERROR") // we can't use language version greater than 1.8 as our minimal supported Gradle 7.6 embeds Kotlin 1.7.10
+                languageVersion.set(KotlinVersion.KOTLIN_1_7)
+                @Suppress("DEPRECATION", "DEPRECATION_ERROR") // we can't use api version greater than 1.7 as our minimal supported Gradle version 7.6 uses kotlin-stdlib 1.7
+                apiVersion.set(KotlinVersion.KOTLIN_1_7)
             }
             freeCompilerArgs.addAll(
                 listOf(