save-buffer commented on a change in pull request #12605:
URL: https://github.com/apache/arrow/pull/12605#discussion_r826247125



##########
File path: cpp/cmake_modules/ThirdpartyToolchain.cmake
##########
@@ -1844,10 +1844,14 @@ macro(build_gtest)
   set(GTEST_VENDORED TRUE)
   set(GTEST_CMAKE_CXX_FLAGS ${EP_CXX_FLAGS})
 
-  if(CMAKE_BUILD_TYPE MATCHES DEBUG)
-    set(CMAKE_GTEST_DEBUG_EXTENSION "d")
+  if(NOT CMAKE_GENERATOR STREQUAL Xcode)

Review comment:
       Now it seems to be not evaluating it 
   ```
   ninja: error: 'googletest_ep-prefix/lib/libgtest$<$<CONFIG:Debug>:d>.dylib', 
needed by 'debug/libarrow_testing.800.0.0.dylib', missing and no known rule to 
make it
   ```
   
   I think generator expressions may be unnecessary overall, everything is 
known at configuration-time, so there's no need to evaluate anything at 
build-time. Multiconfiguration generators always want the flag set, and 
single-configuration generators only want it set in debug mode. 




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