Change policy with legacy compiler backend

[JS] Remove incremental js jps test

[JS] Remove test of maven js archetype

[JS] Fix another one test

[JS] Fix tests for jps

[JS] Try to fix maven test data

[JS] Fix test data

[JS] Fix test data for ant

[JS] Fix jsExtraHelp test

[JS] Fix test run from not-Gradle build tools

[JS] Set flag without compiler error

[JS] Disable warnings and errors in legacy compiler called from Gradle

[JS] Proofread messages

[JS] Not proofread messages

KT-42326

compiler/testData/integration/ant/js/additionalArguments/build.log.expected

@@ -3,7 +3,14 @@ Buildfile: [TestData]/build.xml
 
 build:
 [kotlin2js] Compiling [[TestData]/hello.kt] => [[Temp]/out.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
 
 BUILD SUCCESSFUL
 Total time: [time]

compiler/testData/integration/ant/js/additionalArguments/build.xml

@@ -4,6 +4,7 @@
     <target name="build">
         <kotlin2js src="${test.data}/hello.kt" output="${temp}/out.js">
             <compilerarg value="-Xno-inline"/>
+            <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
         </kotlin2js>
     </target>
 </project>

compiler/testData/integration/ant/js/bothPrefixAndPostfix/build.log.expected

@@ -3,7 +3,14 @@ Buildfile: [TestData]/build.xml
 
 build:
 [kotlin2js] Compiling [[TestData]/root1] => [[Temp]/out.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
 
 BUILD SUCCESSFUL
 Total time: [time]

compiler/testData/integration/ant/js/bothPrefixAndPostfix/build.xml

@@ -5,6 +5,8 @@
     <kotlin2js src="${test.data}/root1"
                output="${temp}/out.js"
                outputPrefix="${test.data}/prefix"
-               outputPostfix="${test.data}/postfix" />
+               outputPostfix="${test.data}/postfix">
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
+    </kotlin2js>
   </target>
 </project>

compiler/testData/integration/ant/js/manySources/build.log.expected

@@ -3,7 +3,14 @@ Buildfile: [TestData]/build.xml
 
 build:
 [kotlin2js] Compiling [[TestData]/root1, [TestData]/bar.kt, [TestData]/root2/Foo.kt] => [[Temp]/out.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
 
 BUILD SUCCESSFUL
 Total time: [time]

compiler/testData/integration/ant/js/manySources/build.xml

@@ -9,6 +9,7 @@
            <include name="**/*.kt"/>
          </fileset>
        </src>
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
     </kotlin2js>
   </target>
 </project>

compiler/testData/integration/ant/js/outputPostfix/build.log.expected

@@ -3,7 +3,14 @@ Buildfile: [TestData]/build.xml
 
 build:
 [kotlin2js] Compiling [[TestData]/root1] => [[Temp]/out.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
 
 BUILD SUCCESSFUL
 Total time: [time]

compiler/testData/integration/ant/js/outputPostfix/build.xml

@@ -2,6 +2,8 @@
   <taskdef resource="org/jetbrains/kotlin/ant/antlib.xml" classpath="${kotlin.lib}/kotlin-ant.jar"/>
 
   <target name="build">
-    <kotlin2js src="${test.data}/root1" output="${temp}/out.js" outputPostfix="${test.data}/postfix" />
+    <kotlin2js src="${test.data}/root1" output="${temp}/out.js" outputPostfix="${test.data}/postfix">
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
+    </kotlin2js>
   </target>
 </project>

compiler/testData/integration/ant/js/outputPrefix/build.log.expected

@@ -3,7 +3,14 @@ Buildfile: [TestData]/build.xml
 
 build:
 [kotlin2js] Compiling [[TestData]/root1] => [[Temp]/out.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
 
 BUILD SUCCESSFUL
 Total time: [time]

compiler/testData/integration/ant/js/outputPrefix/build.xml

@@ -2,6 +2,8 @@
   <taskdef resource="org/jetbrains/kotlin/ant/antlib.xml" classpath="${kotlin.lib}/kotlin-ant.jar"/>
 
   <target name="build">
-    <kotlin2js src="${test.data}/root1" output="${temp}/out.js" outputPrefix="${test.data}/prefix" />
+    <kotlin2js src="${test.data}/root1" output="${temp}/out.js" outputPrefix="${test.data}/prefix">
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
+    </kotlin2js>
   </target>
 </project>

compiler/testData/integration/ant/js/outputWithoutDirectory/build.log.expected

@@ -2,7 +2,14 @@ OUT:
 Buildfile: [TestData]/build.xml
 
 build:
-     [java] warning: legacy compiler is deprecated. Please migrate onto IR.
+     [java] warning: ==========
+     [java] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+     [java]
+     [java] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+     [java] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+     [java]
+     [java] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+     [java] ==========
 
 BUILD SUCCESSFUL
 Total time: [time]

compiler/testData/integration/ant/js/outputWithoutDirectory/build.xml

@@ -6,6 +6,7 @@
         <pathelement location="${kotlin.lib}/kotlin-stdlib.jar"/>
       </classpath>
       <arg value="${test.data}/root1/foo.kt"/>
+      <arg value="-Xuse-deprecated-legacy-compiler"/>
       <arg value="-output"/>
       <arg value="out.js"/>
       <jvmarg value="-noverify"/>

compiler/testData/integration/ant/js/simple/build.log.expected

@@ -3,7 +3,14 @@ Buildfile: [TestData]/build.xml
 
 build:
 [kotlin2js] Compiling [[TestData]/root1] => [[Temp]/out.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
 
 BUILD SUCCESSFUL
 Total time: [time]

compiler/testData/integration/ant/js/simple/build.xml

@@ -2,6 +2,8 @@
   <taskdef resource="org/jetbrains/kotlin/ant/antlib.xml" classpath="${kotlin.lib}/kotlin-ant.jar"/>
 
   <target name="build">
-    <kotlin2js src="${test.data}/root1" output="${temp}/out.js" main="call"/>
+    <kotlin2js src="${test.data}/root1" output="${temp}/out.js" main="call">
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
+    </kotlin2js>
   </target>
 </project>

compiler/testData/integration/ant/js/simpleWithJsFileAsAnotherLib/build.log.expected

@@ -4,9 +4,23 @@ Buildfile: [TestData]/build.xml
 build:
     [mkdir] Created dir: [Temp]/lib
 [kotlin2js] Compiling [[TestData]/jslib-example] => [[Temp]/lib/jslib-example.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
 [kotlin2js] Compiling [[TestData]/root1] => [[Temp]/out.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
      [copy] Copying 2 files to [Temp]
 
 BUILD SUCCESSFUL

compiler/testData/integration/ant/js/simpleWithJsFileAsAnotherLib/build.xml

@@ -5,12 +5,15 @@
   <target name="build">
     <mkdir dir="${temp.library.path}"/>
 
-    <kotlin2js src="${library.path}" output="${temp.library.path}/jslib-example.js" metaInfo="true"/>
+    <kotlin2js src="${library.path}" output="${temp.library.path}/jslib-example.js" metaInfo="true">
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
+    </kotlin2js>
 
     <kotlin2js src="${test.data}/root1" output="${temp}/out.js" main="call">
       <libraries>
         <pathelement path="${temp.library.path}/jslib-example.meta.js"/>
       </libraries>
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
     </kotlin2js>
     <copy todir="${temp}">
       <fileset dir="${temp.library.path}">

compiler/testData/integration/ant/js/simpleWithJsFileAsAnotherLibModuleKind/build.log.expected

@@ -4,9 +4,23 @@ Buildfile: [TestData]/build.xml
 build:
     [mkdir] Created dir: [Temp]/lib
 [kotlin2js] Compiling [[TestData]/jslib-example] => [[Temp]/lib/jslib-example.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
 [kotlin2js] Compiling [[TestData]/root1] => [[Temp]/out.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
      [copy] Copying 2 files to [Temp]
      [copy] Copying 1 file to [Temp]
 

compiler/testData/integration/ant/js/simpleWithJsFileAsAnotherLibModuleKind/build.xml

@@ -5,12 +5,15 @@
   <target name="build">
     <mkdir dir="${temp.library.path}"/>
 
-    <kotlin2js src="${library.path}" output="${temp.library.path}/jslib-example.js" metaInfo="true" moduleKind="umd"/>
+    <kotlin2js src="${library.path}" output="${temp.library.path}/jslib-example.js" metaInfo="true" moduleKind="umd">
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
+    </kotlin2js>
 
     <kotlin2js src="${test.data}/root1" output="${temp}/out.js" main="call" moduleKind="amd">
       <libraries>
         <pathelement path="${temp.library.path}/jslib-example.meta.js"/>
       </libraries>
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
     </kotlin2js>
     <copy todir="${temp}">
       <fileset dir="${temp.library.path}">

compiler/testData/integration/ant/js/simpleWithJsFilesWithTwoModulesAsLibrary/build.log.expected

@@ -4,15 +4,36 @@ Buildfile: [TestData]/build.xml
 build:
     [mkdir] Created dir: [Temp]/lib
 [kotlin2js] Compiling [[TestData]/jslib-example1] => [[Temp]/lib/jslib-example1.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
 [kotlin2js] Compiling [[TestData]/jslib-example2] => [[Temp]/lib/jslib-example2.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
    [delete] Deleting: [Temp]/lib/jslib-example1.js
    [delete] Deleting: [Temp]/lib/jslib-example2.js
    [delete] Deleting: [Temp]/lib/jslib-example1.meta.js
    [delete] Deleting: [Temp]/lib/jslib-example2.meta.js
 [kotlin2js] Compiling [[TestData]/root1] => [[Temp]/out.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
      [copy] Copying 1 file to [Temp]
 
 BUILD SUCCESSFUL

compiler/testData/integration/ant/js/simpleWithJsFilesWithTwoModulesAsLibrary/build.xml

@@ -6,11 +6,14 @@
   <target name="build">
     <mkdir dir="${temp.library.path}"/>
 
-    <kotlin2js src="${library.path1}" output="${temp.library.path}/jslib-example1.js" metaInfo="true"/>
+    <kotlin2js src="${library.path1}" output="${temp.library.path}/jslib-example1.js" metaInfo="true">
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
+    </kotlin2js>
     <kotlin2js src="${library.path2}" output="${temp.library.path}/jslib-example2.js" metaInfo="true">
       <libraries>
         <pathelement path="${temp.library.path}/jslib-example1.meta.js"/>
       </libraries>
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
     </kotlin2js>
 
     <concat destfile="${temp.library.path}/jslib-example.js">
@@ -29,6 +32,7 @@
       <libraries>
         <pathelement path="${temp.library.path}/jslib-example.js"/>
       </libraries>
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
     </kotlin2js>
     <copy todir="${temp}">
       <fileset dir="${temp.library.path}">

compiler/testData/integration/ant/js/simpleWithMain/build.log.expected

@@ -3,7 +3,14 @@ Buildfile: [TestData]/build.xml
 
 build:
 [kotlin2js] Compiling [[TestData]/root1] => [[Temp]/out.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
 
 BUILD SUCCESSFUL
 Total time: [time]

compiler/testData/integration/ant/js/simpleWithMain/build.xml

@@ -2,6 +2,8 @@
   <taskdef resource="org/jetbrains/kotlin/ant/antlib.xml" classpath="${kotlin.lib}/kotlin-ant.jar"/>
 
   <target name="build">
-    <kotlin2js src="${test.data}/root1" output="${temp}/out.js" main="call"/>
+    <kotlin2js src="${test.data}/root1" output="${temp}/out.js" main="call">
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
+    </kotlin2js>
   </target>
 </project>

compiler/testData/integration/ant/js/simpleWithMainFQArgs/build.log.expected

@@ -3,7 +3,14 @@ Buildfile: [TestData]/build.xml
 
 build:
 [kotlin2js] Compiling [[TestData]/root1] => [[Temp]/out.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
 
 BUILD SUCCESSFUL
 Total time: [time]

compiler/testData/integration/ant/js/simpleWithMainFQArgs/build.xml

@@ -2,6 +2,8 @@
   <taskdef resource="org/jetbrains/kotlin/ant/antlib.xml" classpath="${kotlin.lib}/kotlin-ant.jar"/>
 
   <target name="build">
-    <kotlin2js src="${test.data}/root1" output="${temp}/out.js" main="call"/>
+    <kotlin2js src="${test.data}/root1" output="${temp}/out.js" main="call">
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
+    </kotlin2js>
   </target>
 </project>

compiler/testData/integration/ant/js/simpleWithTwoJsFilesAsLibraries/build.log.expected

@@ -4,11 +4,32 @@ Buildfile: [TestData]/build.xml
 build:
     [mkdir] Created dir: [Temp]/lib
 [kotlin2js] Compiling [[TestData]/jslib-example1] => [[Temp]/lib/jslib-example1.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
 [kotlin2js] Compiling [[TestData]/jslib-example2] => [[Temp]/lib/jslib-example2.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
 [kotlin2js] Compiling [[TestData]/root1] => [[Temp]/out.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
      [copy] Copying 4 files to [Temp]
 
 BUILD SUCCESSFUL

compiler/testData/integration/ant/js/simpleWithTwoJsFilesAsLibraries/build.xml

@@ -6,11 +6,14 @@
   <target name="build">
     <mkdir dir="${temp.library.path}"/>
 
-    <kotlin2js src="${library.path1}" output="${temp.library.path}/jslib-example1.js" metaInfo="true"/>
+    <kotlin2js src="${library.path1}" output="${temp.library.path}/jslib-example1.js" metaInfo="true">
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
+    </kotlin2js>
     <kotlin2js src="${library.path2}" output="${temp.library.path}/jslib-example2.js" metaInfo="true">
       <libraries>
         <pathelement path="${temp.library.path}/jslib-example1.meta.js"/>
       </libraries>
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
     </kotlin2js>
 
     <kotlin2js src="${test.data}/root1" output="${temp}/out.js" main="call">
@@ -18,6 +21,7 @@
         <pathelement path="${temp.library.path}/jslib-example1.meta.js"/>
         <pathelement path="${temp.library.path}/jslib-example2.meta.js"/>
       </libraries>
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
     </kotlin2js>
     <copy todir="${temp}">
       <fileset dir="${temp.library.path}">

compiler/testData/integration/ant/js/simpleWithVarargMain/build.log.expected

@@ -3,7 +3,14 @@ Buildfile: [TestData]/build.xml
 
 build:
 [kotlin2js] Compiling [[TestData]/root1] => [[Temp]/out.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
 
 BUILD SUCCESSFUL
 Total time: [time]

compiler/testData/integration/ant/js/simpleWithVarargMain/build.xml

@@ -2,6 +2,8 @@
   <taskdef resource="org/jetbrains/kotlin/ant/antlib.xml" classpath="${kotlin.lib}/kotlin-ant.jar"/>
 
   <target name="build">
-    <kotlin2js src="${test.data}/root1" output="${temp}/out.js" main="call"/>
+    <kotlin2js src="${test.data}/root1" output="${temp}/out.js" main="call">
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
+    </kotlin2js>
   </target>
 </project>

compiler/testData/integration/ant/js/simpleWithoutStdlib/build.log.expected

@@ -3,7 +3,14 @@ Buildfile: [TestData]/build.xml
 
 build:
 [kotlin2js] Compiling [[TestData]/root1] => [[Temp]/out.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
 
 BUILD SUCCESSFUL
 Total time: [time]

compiler/testData/integration/ant/js/simpleWithoutStdlib/build.xml

@@ -2,6 +2,8 @@
   <taskdef resource="org/jetbrains/kotlin/ant/antlib.xml" classpath="${kotlin.lib}/kotlin-ant.jar"/>
 
   <target name="build">
-    <kotlin2js src="${test.data}/root1" noStdlib="true" output="${temp}/out.js"/>
+    <kotlin2js src="${test.data}/root1" noStdlib="true" output="${temp}/out.js">
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
+    </kotlin2js>
   </target>
 </project>

compiler/testData/integration/ant/js/simpleWithoutStdlibAndFolderAsAnotherLib/build.log.expected

@@ -4,9 +4,23 @@ Buildfile: [TestData]/build.xml
 build:
     [mkdir] Created dir: [Temp]/lib
 [kotlin2js] Compiling [[TestData]/jslib-example] => [[Temp]/lib/jslib-example.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
 [kotlin2js] Compiling [[TestData]/root1] => [[Temp]/out.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
      [copy] Copying 2 files to [Temp]
 
 BUILD SUCCESSFUL

compiler/testData/integration/ant/js/simpleWithoutStdlibAndFolderAsAnotherLib/build.xml

@@ -5,12 +5,15 @@
   <target name="build">
     <mkdir dir="${temp.library.path}"/>
 
-    <kotlin2js src="${library.path}" noStdlib="true" output="${temp.library.path}/jslib-example.js" metaInfo="true"/>
+    <kotlin2js src="${library.path}" noStdlib="true" output="${temp.library.path}/jslib-example.js" metaInfo="true">
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
+    </kotlin2js>
 
     <kotlin2js src="${test.data}/root1" noStdlib="true" output="${temp}/out.js" main="call">
       <libraries>
         <pathelement path="${temp.library.path}"/>
       </libraries>
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
     </kotlin2js>
     <copy todir="${temp}">
       <fileset dir="${temp.library.path}">

compiler/testData/integration/ant/js/simpleWithoutStdlibAndJsFileAsAnotherLib/build.log.expected

@@ -4,9 +4,23 @@ Buildfile: [TestData]/build.xml
 build:
     [mkdir] Created dir: [Temp]/lib
 [kotlin2js] Compiling [[TestData]/jslib-example] => [[Temp]/lib/jslib-example.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
 [kotlin2js] Compiling [[TestData]/root1] => [[Temp]/out.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
      [copy] Copying 2 files to [Temp]
 
 BUILD SUCCESSFUL

compiler/testData/integration/ant/js/simpleWithoutStdlibAndJsFileAsAnotherLib/build.xml

@@ -5,12 +5,15 @@
   <target name="build">
     <mkdir dir="${temp.library.path}"/>
 
-    <kotlin2js src="${library.path}" noStdlib="true" output="${temp.library.path}/jslib-example.js" metaInfo="true"/>
+    <kotlin2js src="${library.path}" noStdlib="true" output="${temp.library.path}/jslib-example.js" metaInfo="true">
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
+    </kotlin2js>
 
     <kotlin2js src="${test.data}/root1" noStdlib="true" output="${temp}/out.js" main="call">
       <libraries>
         <pathelement path="${temp.library.path}/jslib-example.meta.js"/>
       </libraries>
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
     </kotlin2js>
     <copy todir="${temp}">
       <fileset dir="${temp.library.path}">

compiler/testData/integration/ant/js/sourceMap/build.log.expected

@@ -3,7 +3,14 @@ Buildfile: [TestData]/build.xml
 
 build:
 [kotlin2js] Compiling [[TestData]/root1] => [[Temp]/out.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
 
 BUILD SUCCESSFUL
 Total time: [time]

compiler/testData/integration/ant/js/sourceMap/build.xml

@@ -2,6 +2,8 @@
   <taskdef resource="org/jetbrains/kotlin/ant/antlib.xml" classpath="${kotlin.lib}/kotlin-ant.jar"/>
 
   <target name="build">
-    <kotlin2js src="${test.data}/root1" output="${temp}/out.js" sourcemap="true"/>
+    <kotlin2js src="${test.data}/root1" output="${temp}/out.js" sourcemap="true">
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
+    </kotlin2js>
   </target>
 </project>

compiler/testData/integration/ant/js/suppressWarnings/build.log.expected

@@ -3,7 +3,14 @@ Buildfile: [TestData]/build.xml
 
 build:
 [kotlin2js] Compiling [[TestData]/root1] => [[Temp]/out.js]
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
 
 BUILD SUCCESSFUL
 Total time: [time]

compiler/testData/integration/ant/js/suppressWarnings/build.xml

@@ -2,6 +2,8 @@
   <taskdef resource="org/jetbrains/kotlin/ant/antlib.xml" classpath="${kotlin.lib}/kotlin-ant.jar"/>
 
   <target name="build">
-    <kotlin2js src="${test.data}/root1" output="${temp}/out.js" nowarn="true"/>
+    <kotlin2js src="${test.data}/root1" output="${temp}/out.js" nowarn="true">
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
+    </kotlin2js>
   </target>
 </project>

compiler/testData/integration/ant/js/verbose/build.log.expected

@@ -6,7 +6,14 @@ build:
 [kotlin2js] logging: using Kotlin home directory [KotlinProjectHome]/dist/kotlinc
 [kotlin2js] logging: exception on loading scripting plugin: java.lang.ClassNotFoundException: org.jetbrains.kotlin.scripting.compiler.plugin.ScriptingCompilerConfigurationComponentRegistrar
 [kotlin2js] logging: compiling source files: [TestData]/root1/foo.kt
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
 
 BUILD SUCCESSFUL
 Total time: [time]

compiler/testData/integration/ant/js/verbose/build.xml

@@ -2,6 +2,8 @@
   <taskdef resource="org/jetbrains/kotlin/ant/antlib.xml" classpath="${kotlin.lib}/kotlin-ant.jar"/>
 
   <target name="build">
-    <kotlin2js src="${test.data}/root1" output="${temp}/out.js" verbose="true"/>
+    <kotlin2js src="${test.data}/root1" output="${temp}/out.js" verbose="true">
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
+    </kotlin2js>
   </target>
 </project>

compiler/testData/integration/ant/js/version/build.log.expected

@@ -4,7 +4,14 @@ Buildfile: [TestData]/build.xml
 build:
 [kotlin2js] Compiling [[TestData]/root1] => [[Temp]/out.js]
 [kotlin2js] info: kotlinc-js [KotlinVersion] (JRE [JREVersion])
-[kotlin2js] warning: legacy compiler is deprecated. Please migrate onto IR.
+[kotlin2js] warning: ==========
+[kotlin2js] This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.
+[kotlin2js]
+[kotlin2js] Please migrate your project to the new IR-based compiler (https://kotl.in/jsir).
+[kotlin2js] Because your build tool will not support the new Kotlin/JS compiler, you will also need to migrate to Gradle.
+[kotlin2js]
+[kotlin2js] You can continue to use the deprecated legacy compiler in the current version of the toolchain by providing the compiler option -Xuse-deprecated-legacy-compiler.
+[kotlin2js] ==========
 
 BUILD SUCCESSFUL
 Total time: [time]

compiler/testData/integration/ant/js/version/build.xml

@@ -2,6 +2,8 @@
   <taskdef resource="org/jetbrains/kotlin/ant/antlib.xml" classpath="${kotlin.lib}/kotlin-ant.jar"/>
 
   <target name="build">
-    <kotlin2js src="${test.data}/root1" output="${temp}/out.js" printVersion="true"/>
+    <kotlin2js src="${test.data}/root1" output="${temp}/out.js" printVersion="true">
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
+    </kotlin2js>
   </target>
 </project>