(arrow) branch main updated: GH-46388: [C++] Check `Snappy::snappy{,-static}` in `FindSnappyAlt.cmake` (#46389)

[kou]

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The following commit(s) were added to refs/heads/main by this push:
     new 73273e8f00 GH-46388: [C++] Check `Snappy::snappy{,-static}` in 
`FindSnappyAlt.cmake` (#46389)
73273e8f00 is described below

commit 73273e8f0026c4102a81fd7c52b5038198a5dc4a
Author: Sutou Kouhei <k...@clear-code.com>
AuthorDate: Mon May 12 14:12:29 2025 +0900

    GH-46388: [C++] Check `Snappy::snappy{,-static}` in `FindSnappyAlt.cmake` 
(#46389)
    
    ### Rationale for this change
    
    Other projects' `FindSnappy.cmake` may create `Snappy::snappy{,-static}` 
CMake targets. If they are created, our `FindSnappyAlt.cmake` will be failed.
    
    ### What changes are included in this PR?
    
    Check whether `Snappy::snappy{,-static}` are already defined to avoid 
conflicting with other projects' `FindSnappy.cmake`.
    
    ### Are these changes tested?
    
    Yes.
    
    ### Are there any user-facing changes?
    
    Yes.
    * GitHub Issue: #46388
    
    Authored-by: Sutou Kouhei <k...@clear-code.com>
    Signed-off-by: Sutou Kouhei <k...@clear-code.com>
---
 cpp/cmake_modules/FindSnappyAlt.cmake | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/cpp/cmake_modules/FindSnappyAlt.cmake 
b/cpp/cmake_modules/FindSnappyAlt.cmake
index 4d31340064..d0a06f0997 100644
--- a/cpp/cmake_modules/FindSnappyAlt.cmake
+++ b/cpp/cmake_modules/FindSnappyAlt.cmake
@@ -19,6 +19,18 @@ if(SnappyAlt_FOUND)
   return()
 endif()
 
+if(ARROW_SNAPPY_USE_SHARED)
+  if(TARGET Snappy::snappy)
+    set(Snappy_TARGET Snappy::snappy)
+    set(SnappyAlt_FOUND TRUE)
+    return()
+  elseif(TARGET Snappy::snappy-static)
+    set(Snappy_TARGET Snappy::snappy-static)
+    set(SnappyAlt_FOUND TRUE)
+    return()
+  endif()
+endif()
+
 set(find_package_args)
 if(SnappyAlt_FIND_VERSION)
   list(APPEND find_package_args ${SnappyAlt_FIND_VERSION})