add DEV_BUILD as a preprocessor

The preprocessor automatically activates if the mod version contains "dev"

build.gradle

@@ -12,7 +12,14 @@ plugins {
     id "dev.architectury.loom" version "0.10.0-SNAPSHOT" apply false
 }
 
+/**
+ * Creates the list of preprocessors to use.
+ *
+ * @param mcVers array of all MC versions
+ * @param mcIndex array index of the currently active MC version
+ */
 def writeBuildGradlePredefine(List<String> mcVers, int mcIndex) {
+
     ArrayList<String> redefineList = new ArrayList<String>()
     for (int i=0; i<mcVers.size(); i++) {
         String mcStr = mcVers.get(i).replace(".", "_")
@@ -26,9 +33,21 @@ def writeBuildGradlePredefine(List<String> mcVers, int mcIndex) {
             redefineList.add("POST_MC_"+mcStr)
         }
     }
+
+    // build the list of preprocessors to use
     StringBuilder sb = new StringBuilder()
-    for (String s : redefineList) {
-        sb.append(s)
+
+    // check if this is a development build
+    if (mod_version.toLowerCase().contains("dev")) {
+        // WARNING: only use this for logging, we don't want to have confusion
+        // when a method doesn't work correctly in the release build.
+        sb.append("DEV_BUILD")
+        sb.append("=\n")
+    }
+
+    // build the MC version preprocessors
+    for (String redefinedVersion : redefineList) {
+        sb.append(redefinedVersion)
         sb.append("=\n")
     }
     new File(projectDir, "build.properties").text = sb.toString()