[ARROW-15782] [C++] Findre2Alt.cmake did not honor RE2_ROOT

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 7.0.0
• Fix Version/s: 7.0.2, 8.0.0
• Component/s: C++
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/31225
• Assignee: Haowei Yu
• Reporter: Haowei Yu
• Created: 25/Feb/22 00:58
• Updated: 11/Jan/23 11:39
• Resolved: 01/Mar/22 21:10

Description

In Findre2Alt.cmake, cmake module find re2 package config first, which is likely to find system re2 package first over my customized re2 library. We should check RE2_ROOT variable first, and if there is no value existed, then we should search for system re2.

Issue Links

• links to: GitHub Pull Request #12513