Only llvm-link generated files in CompileToBitcode (#4536)

kotlin-native/build-tools/src/main/kotlin/org/jetbrains/kotlin/bitcode/CompileToBitcode.kt

@@ -43,9 +43,6 @@ open class CompileToBitcode @Inject constructor(
     var srcDirs: FileCollection = project.files(srcRoot.resolve("cpp"))
     var headersDirs: FileCollection = project.files(srcRoot.resolve("headers"))
 
-    @Input
-    var skipLinkagePhase = false
-
     @Input
     var language = Language.CPP
 
@@ -92,6 +89,9 @@ open class CompileToBitcode @Inject constructor(
             }
         }
 
+    private fun outputFileForInputFile(file: File, extension: String) = objDir.resolve("${file.nameWithoutExtension}.${extension}")
+    private fun bitcodeFileForInputFile(file: File) = outputFileForInputFile(file, "bc")
+
     @get:InputFiles
     protected val headers: Iterable<File>
         get() {
@@ -142,15 +142,13 @@ open class CompileToBitcode @Inject constructor(
             it.args = compilerFlags + inputFiles.map { it.absolutePath }
         }
 
-        if (!skipLinkagePhase) {
-            project.exec {
-                val llvmDir = project.findProperty("llvmDir")
-                it.executable = "$llvmDir/bin/llvm-link"
-                it.args = listOf("-o", outFile.absolutePath) + linkerArgs +
-                        project.fileTree(objDir) {
-                            it.include("**/*.bc")
-                        }.files.map { it.absolutePath }
-            }
+        project.exec {
+            val llvmDir = project.findProperty("llvmDir")
+            it.executable = "$llvmDir/bin/llvm-link"
+            it.args = listOf("-o", outFile.absolutePath) + linkerArgs +
+                    inputFiles.map {
+                        bitcodeFileForInputFile(it).absolutePath
+                    }
         }
     }
 }