kou opened a new pull request, #37412:
URL: https://github.com/apache/arrow/pull/37412

   ### Rationale for this change
   
   Gandiva always links LLVM statically. But we can use LLVM shared library 
instead to reduce `libgandiva.so` size.
   
   ### What changes are included in this PR?
   
   Add `ARROW_LLVM_USE_SHARED` like other dependencies.
   
   ### Are these changes tested?
   
   Yes.
   
   ### Are there any user-facing changes?
   
   Yes.
   
   This has a backward incompatible change. LLVM shared library not static 
libraries is used by default. If you want to use LLVM static libraries, you 
need to specify `-DARROW_LLVM_USE_SHARED=OFF` or 
`-DARROW_DEPENDENCY_USE_SHARED=OFF` explicitly.


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