codeconsole commented on code in PR #15127:
URL: https://github.com/apache/grails-core/pull/15127#discussion_r2427779629


##########
grails-gradle/model/src/main/groovy/grails/util/BuildSettings.groovy:
##########
@@ -253,7 +253,7 @@ class BuildSettings {
         }
         BASE_DIR = System.getProperty(APP_BASE_DIR) ? new 
File(System.getProperty(APP_BASE_DIR)) : 
(IOUtils.findApplicationDirectoryFile() ?: new File('.'))
         GRAILS_APP_DIR_PRESENT = new File(BASE_DIR, 'grails-app').exists() || 
new File(BASE_DIR, 'Application.groovy').exists()
-        TARGET_DIR = new File(BASE_DIR, 'build')
+        TARGET_DIR = System.getProperty(PROJECT_TARGET_DIR) ? new 
File(BASE_DIR, System.getProperty(PROJECT_TARGET_DIR)) : new File(BASE_DIR, 
'build')

Review Comment:
   Setting it allows running multiple builds for various versions of Grails 
simultaneously
   ```
   ./gradlew bootRun --project-prop buildDir=build-7.0.0-RC2  
-PgrailsVersion=7.0.0-RC2
   ./gradlew bootRun --project-prop buildDir=build-7.0.0-SNAPSHOT 
-PgrailsVersion=7.0.0-SNAPSHOT
   ```
   
   not setting results in the pidfile being created in the same location and 
throwing an exception.
   
   @jdaugherty how is it breaking? if it is not set, it reverts to the way it 
was previously.



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