adam-markovics commented on a change in pull request #1149:
URL: https://github.com/apache/nifi-minifi-cpp/pull/1149#discussion_r682377404



##########
File path: cmake/BundledPahoMqttC.cmake
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@@ -45,7 +45,7 @@ function(use_bundled_pahomqttc SOURCE_DIR BINARY_DIR)
     ExternalProject_Add(
             paho.mqtt.c-external
             GIT_REPOSITORY "https://github.com/eclipse/paho.mqtt.c.git";
-            GIT_TAG "6aa07f575bc9369402b1b252fd280373f8d585ef" # This is not a 
tagged/released version, but the exact one that was in our repo.
+            GIT_TAG "3b7ae6348bc917d42c04efa962e4868c09bbde9f" # Once tagged 
as v1.3.9 release, but tags may move

Review comment:
       They can move like this: delete tag (`git tag -d tagname`), put the same 
tag somewhere else.
   From Professional CMake by Craig Scott on ExternalProject_Add (chapter 
27.1.1):
   "While GIT_TAG does support these different choices, it should be noted that 
only a commit hash is truly unambiguous.
   With git, the commit referenced by a branch or tag name can move over time, 
so using them does not guarantee a repeatable build."




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