WillAyd commented on code in PR #47282:
URL: https://github.com/apache/arrow/pull/47282#discussion_r2263016632


##########
cpp/src/arrow/meson.build:
##########
@@ -484,14 +505,22 @@ if needs_compute
     arrow_compute_lib = library(
         'arrow-compute',
         sources: arrow_compute_lib_sources,
-        dependencies: arrow_dep,
+        dependencies: [arrow_dep] + int128_deps,

Review Comment:
   This is to build the library itself, not to expose it to consumers. I 
believe that MSVC/Windows do not offer a native 128 bit integer, so the 
`int128_deps` grabs it from the boost multiprecision header. On other 
platforms, this dependency is empty



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