[K/N] Mention test_compile_only in HACKING.md

kotlin-native/HACKING.md

@@ -98,6 +98,9 @@ and then a final native binary is produced from this klibrary using the -Xinclud
         ./gradlew -Ptest_two_stage :kotlin-native:backend.native:tests:array0
         
 * **-Ptest_with_cache_kind=static|dynamic** enables using caches during testing. 
+
+* **-Ptest_compile_only** allows one to only compile tests, without actually running them. It is useful for testing compilation pipeline in 
+case of targets that are tricky to execute tests on.
        
  ### Runtime unit tests
  

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

@@ -87,7 +87,7 @@ val Project.cacheRedirectorEnabled
     get() = findProperty("cacheRedirectorEnabled")?.toString()?.toBoolean() ?: false
 
 val Project.compileOnlyTests: Boolean
-    get() = hasProperty("compile-only-tests")
+    get() = hasProperty("test_compile_only")
 
 fun Project.redirectIfEnabled(url: String):String = if (cacheRedirectorEnabled) {
     val base = URL(url)