kou commented on code in PR #34765:
URL: https://github.com/apache/arrow/pull/34765#discussion_r1151436316
##########
cpp/cmake_modules/SetupCxxFlags.cmake:
##########
@@ -115,6 +115,9 @@ elseif(ARROW_CPU_FLAG STREQUAL "aarch64")
if(ARROW_SIMD_LEVEL STREQUAL "DEFAULT")
set(ARROW_SIMD_LEVEL "NEON")
endif()
+ if(APPLE)
+ set(GTest_SOURCE "BUNDLED")
+ endif()
Review Comment:
We should not change `*_SOURCE` in `SetupCxxFlags.cmake`.
We should process `*_SOURCE` in `ThirdpartyToolchain.cmake`.
This problem is caused by C++ standard difference, right?
For example, this problem is caused when Apache Arrow C++ uses C++17 and
system GoogleTest uses C++14.
Can we detect whether system GoogleTest uses different C++ standard than
Apache Arrow C++? If we can detect it, we can fallback to bundled GoogleTest
automatically when system GoogleTest uses different C++ standard.
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