kou opened a new pull request, #39932:
URL: https://github.com/apache/arrow/pull/39932
### Rationale for this change
We chose Libs{,.private} with libre2.a for system RE2 in GH-10626. Because
"Require{,.private} re2" may add "-std=c++11". If "-std=c++11" was added, users
can't build Apache Arrow C++ because Apache Arrow C++ requires C++17 or later.
But this approach doesn't work with RE2 2024-06-01 or later because it at
least requires Abseil. If we keep the Libs{,.private} approach, we also need to
add Abseil libraries to Libs{,.private}. But it's unmaintainable.
### What changes are included in this PR?
Let's use "Requires{,.private} re2" instead of Libs{,.private}. I hope
recent re2.pc doesn't add "-std=c++11".
### Are these changes tested?
Yes.
### Are there any user-facing changes?
Yes.
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