From 425963cdf2c9706926fb97bfffc9c3ce85338831 Mon Sep 17 00:00:00 2001
From: Pratyush Adhikari <pratyushadk990@gmail.com>
Date: Wed, 29 Jul 2026 22:15:14 +0530
Subject: [PATCH] GH-50702: [Python] Fix .pyx edits requiring two builds by
 enabling BYPRODUCTS in Cython CMake target

---
 cpp/cmake_modules/UseCython.cmake | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/cpp/cmake_modules/UseCython.cmake b/cpp/cmake_modules/UseCython.cmake
index 7d88daa4fade..fd558d78ca78 100644
--- a/cpp/cmake_modules/UseCython.cmake
+++ b/cpp/cmake_modules/UseCython.cmake
@@ -154,9 +154,7 @@ function(compile_pyx
             "${CMAKE_CURRENT_BINARY_DIR}/${output_file}"
             "${CMAKE_CURRENT_SOURCE_DIR}/${pyx_file}"
     DEPENDS ${pyx_location}
-            # Do not specify byproducts for now since they don't work with the older
-            # version of cmake available in the apt repositories.
-            #BYPRODUCTS ${_generated_files}
+    BYPRODUCTS ${_generated_files}
     COMMENT ${comment})
 
   # Remove their visibility to the user.