Use rsp for kotlin classpath

Support long classpaths by passing the classpath in a file to the script
that generates build.xml.

Bug: 308016794
Test: builds
Flag: EXEMPT refactor
Change-Id: Ib238a83a26acba7ede8e55298397dbeb9a57a866
diff --git a/java/kotlin.go b/java/kotlin.go
index aa2db0e..c28bc3f 100644
--- a/java/kotlin.go
+++ b/java/kotlin.go
@@ -101,6 +101,10 @@
 		commonSrcFilesArg = "--common_srcs " + commonSrcsList.String()
 	}
 
+	classpathRspFile := android.PathForModuleOut(ctx, "kotlinc", "classpath.rsp")
+	android.WriteFileRule(ctx, classpathRspFile, strings.Join(flags.kotlincClasspath.Strings(), " "))
+	deps = append(deps, classpathRspFile)
+
 	ctx.Build(pctx, android.BuildParams{
 		Rule:           kotlinc,
 		Description:    "kotlinc",
@@ -109,7 +113,7 @@
 		Inputs:         srcFiles,
 		Implicits:      deps,
 		Args: map[string]string{
-			"classpath":         flags.kotlincClasspath.FormJavaClassPath(""),
+			"classpath":         classpathRspFile.String(),
 			"kotlincFlags":      flags.kotlincFlags,
 			"commonSrcFilesArg": commonSrcFilesArg,
 			"srcJars":           strings.Join(srcJars.Strings(), " "),
@@ -205,6 +209,10 @@
 	kotlinName := filepath.Join(ctx.ModuleDir(), ctx.ModuleSubDir(), ctx.ModuleName())
 	kotlinName = strings.ReplaceAll(kotlinName, "/", "__")
 
+	classpathRspFile := android.PathForModuleOut(ctx, "kapt", "classpath.rsp")
+	android.WriteFileRule(ctx, classpathRspFile, strings.Join(flags.kotlincClasspath.Strings(), "\n"))
+	deps = append(deps, classpathRspFile)
+
 	// First run kapt to generate .java stubs from .kt files
 	kaptStubsJar := android.PathForModuleOut(ctx, "kapt", "stubs.jar")
 	ctx.Build(pctx, android.BuildParams{
@@ -214,7 +222,7 @@
 		Inputs:      srcFiles,
 		Implicits:   deps,
 		Args: map[string]string{
-			"classpath":         flags.kotlincClasspath.FormJavaClassPath(""),
+			"classpath":         classpathRspFile.String(),
 			"kotlincFlags":      flags.kotlincFlags,
 			"commonSrcFilesArg": commonSrcFilesArg,
 			"srcJars":           strings.Join(srcJars.Strings(), " "),
diff --git a/scripts/gen-kotlin-build-file.py b/scripts/gen-kotlin-build-file.py
index 99afdca..8b7876f 100644
--- a/scripts/gen-kotlin-build-file.py
+++ b/scripts/gen-kotlin-build-file.py
@@ -37,7 +37,7 @@
   parser.add_argument('--out', dest='out',
                       help='file to which the module.xml contents will be written.')
   parser.add_argument('--classpath', dest='classpath', action='append', default=[],
-                      help='classpath to pass to kotlinc.')
+                      help='file containing classpath to pass to kotlinc.')
   parser.add_argument('--name', dest='name',
                       help='name of the module.')
   parser.add_argument('--out_dir', dest='out_dir',
@@ -65,8 +65,8 @@
     f.write('  <module name="%s" type="java-production" outputDir="%s">\n' % (args.name, args.out_dir or ''))
 
     # Print classpath entries
-    for c in args.classpath:
-      for entry in c.split(':'):
+    for classpath_rsp_file in args.classpath:
+      for entry in NinjaRspFileReader(classpath_rsp_file):
         path = os.path.abspath(entry)
         f.write('    <classpath path="%s"/>\n' % path)