[I] Impossible to build shared Arrow with ZSTD without hitting xtl dependency (Debian 12) [arrow]

[via GitHub]

aborruso opened a new issue, #45899:
URL: https://github.com/apache/arrow/issues/45899

   ### Describe the bug, including details regarding any error messages, 
version, and platform.
   
   Hi folks,
   
   I'm trying to build Apache Arrow from source on **Debian 12** with Parquet 
and ZSTD support, but without optional dependencies like `xtl`, `xsimd`, 
`xtensor`, etc.
   
   Despite setting what I believe are the correct CMake flags:
   
   ```bash
   cmake .. \
     -DCMAKE_BUILD_TYPE=Release \
     -DARROW_PARQUET=ON \
     -DARROW_WITH_ZSTD=ON \
     -DARROW_WITH_ZLIB=ON \
     -DARROW_WITH_SNAPPY=ON \
     -DARROW_WITH_LZ4=OFF \
     -DARROW_WITH_BROTLI=OFF \
     -DARROW_WITH_XSIMD=OFF \
     -DARROW_SIMD_LEVEL=NONE \
     -DARROW_DEPENDENCY_SOURCE=SYSTEM
   ```
   
   …the build **always fails when linking `libarrow.so`**, with:
   
   ```
   /usr/bin/ld: cannot find -lxtl: No such file or directory
   ```
   
   I’ve confirmed there are **no direct references to `xtl` in the codebase** 
(`grep -ri xtl` returns nothing in `src/`).  
   I've tried all of the following:
   
   - clean builds from scratch
   - `-DARROW_WITH_XSIMD=OFF`
   - `-DARROW_SIMD_LEVEL=NONE`
   - cloning a fresh copy of the repo to avoid contaminated CMakeCache
   - even tried forcing all dependencies to `SYSTEM`
   
   ### 🧩 Related issues & workarounds
   
   I’ve seen this mentioned in:
   
   - 
[https://github.com/apache/arrow/issues/37678](https://github.com/apache/arrow/issues/37146)
   - and the linked xsimd issue: 
[https://github.com/xtensor-stack/xsimd/issues/788](https://github.com/xtensor-stack/xsimd/issues/788)
   
   …but it's still unclear **why Arrow links to `xtl` even with xsimd disabled**
   
   * * *
   
   ### 🙏 Request
   
   Could we please:
   
   - clarify in the documentation **how to avoid `xtl` / `xsimd` altogether**
   - explain how `xtl` gets into the shared build path even when not requested
   - maybe provide a proper flag like `-DARROW_WITH_XTL=OFF`?
   
   Thanks a lot for all your great work — I love Arrow, but this one really 
stumped me.
   
   All the best,  
   
   Andrea
   
   ### Component(s)
   
   Parquet


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