(arrow) 04/04: GH-45987: [C++] Set CMAKE_POLICY_VERSION_MINIMUM=3.5 for bundled dependencies (#45997)

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brycemecum pushed a commit to branch maint-19.0.1.1-r
in repository https://gitbox.apache.org/repos/asf/arrow.git

commit 709d70ff85ea7dc6047b7f1860738bf69b552f92
Author: Jacob Wujciak-Jens <ja...@wujciak.de>
AuthorDate: Tue Apr 1 14:45:01 2025 +0200

    GH-45987: [C++] Set CMAKE_POLICY_VERSION_MINIMUM=3.5 for bundled dependencies (#45997)
    
    ### Rationale for this change
    Enable building with CMake 4.0 and bundled dependencies that still set `cmake_minimum_required(VERSION 3.5)` or less.
    
    ### What changes are included in this PR?
    Set https://cmake.org/cmake/help/latest/variable/CMAKE_POLICY_VERSION_MINIMUM.html
    ### Are these changes tested?
    CI
    ### Are there any user-facing changes?
    No
    * GitHub Issue: #45987
    
    Authored-by: Jacob Wujciak-Jens <ja...@wujciak.de>
    Signed-off-by: Jacob Wujciak-Jens <ja...@wujciak.de>
---
 cpp/cmake_modules/ThirdpartyToolchain.cmake | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/cpp/cmake_modules/ThirdpartyToolchain.cmake b/cpp/cmake_modules/ThirdpartyToolchain.cmake
index abfe6d274f..1d71283063 100644
--- a/cpp/cmake_modules/ThirdpartyToolchain.cmake
+++ b/cpp/cmake_modules/ThirdpartyToolchain.cmake
@@ -967,7 +967,8 @@ set(EP_COMMON_CMAKE_ARGS
     -DCMAKE_FIND_PACKAGE_NO_PACKAGE_REGISTRY=${CMAKE_FIND_PACKAGE_NO_PACKAGE_REGISTRY}
     -DCMAKE_INSTALL_LIBDIR=lib
     -DCMAKE_OSX_SYSROOT=${CMAKE_OSX_SYSROOT}
-    -DCMAKE_VERBOSE_MAKEFILE=${CMAKE_VERBOSE_MAKEFILE})
+    -DCMAKE_VERBOSE_MAKEFILE=${CMAKE_VERBOSE_MAKEFILE}
+    -DCMAKE_POLICY_VERSION_MINIMUM=3.5)
 
 # if building with a toolchain file, pass that through
 if(CMAKE_TOOLCHAIN_FILE)
@@ -1033,6 +1034,8 @@ macro(prepare_fetchcontent)
   set(CMAKE_COMPILE_WARNING_AS_ERROR FALSE)
   set(CMAKE_EXPORT_NO_PACKAGE_REGISTRY TRUE)
   set(CMAKE_MACOSX_RPATH ${ARROW_INSTALL_NAME_RPATH})
+  set(CMAKE_POLICY_VERSION_MINIMUM 3.5)
+
   if(MSVC)
     string(REPLACE "/WX" "" CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG}")
     string(REPLACE "/WX" "" CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}")