cppBehaviorTree/BehaviorTree.CPP #1119Not a task: not reproduced

BTCPP_LIBRARY_VERSION can be set uncorrectly

envgap__BehaviorTree__BehaviorTree.CPP-1119

Original GitHub issue ↗Dated source checkout ↗Opened 2026-02-17

01 / FAILURE SIGNATURE

As reported upstream

No identifying execution failure has been captured.

Not a benchmark task.

In a clean container the reported failure did not reproduce, or the known fix did not make the project run.

02 / ENVIRONMENT RECIPE

Base commit: c88a9f429a421b312599a07fa8902524b09bf90a
Manifest: CMakeLists.txt
Reproduce: Awaiting issue-specific recipe
Run under trace: Awaiting a meaningful runtime command

03 / ORIGINAL ISSUE TEXT

BehaviorTree/BehaviorTree.CPP #1119 · read the original issue

**Describe the bug**

BTCPP_LIBRARY_VERSION can get the value of CMAKE_PROJECT_VERSION from the project parent.

```
grep -rnHe "BTCPP_LIBRARY_VERSION"
src/behavior_tree.cpp:118:    auto const parts = splitString(BTCPP_LIBRARY_VERSION, '.');
src/behavior_tree.cpp:127:  return BTCPP_LIBRARY_VERSION;
CMakeLists.txt:257:target_compile_definitions(${BTCPP_LIBRARY} PUBLIC BTCPP_LIBRARY_VERSION="${CMAKE_PROJECT_VERSION}")
```

**How to Reproduce**

I'm not totally sure how to reproduce.

Inside a CMakeList.txt:

```
  FetchContent_Declare(
    BehaviorTree
    GIT_REPOSITORY https://github.com/BehaviorTree/BehaviorTree.CPP.git
    GIT_TAG 4.6.2)
  FetchContent_MakeAvailable(BehaviorTree)
```

Compiling in verbose mode, you can see different values :

- Either get the GIT_TAG of another FetchContent_Declare
```
... -DBTCPP_LIBRARY_VERSION=\"0.11.1\"
```
- or a dummy value:
```
... -DBTCPP_LIBRARY_VERSION=\"\"
```
- or even:
```
... -DBTCPP_LIBRARY_VERSION=\"1.0.0\"
```

Continue on GitHub ↗

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