[ARROW-15603] [C++] Clang 13 build fails on unused var

• Type: Bug
• Status: Resolved
• Priority: Minor
• 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/31065

Language

C++

• Assignee: Will Jones
• Reporter: Will Jones
• Created: 07/Feb/22 16:53
• Updated: 11/Jan/23 11:38
• Resolved: 07/Feb/22 18:38

Description

Just a small issue. When I build with clang 13 I get the following error from a unused var warning:

/Users/willjones/Documents/arrows/arrow/cpp/src/arrow/python/numpy_to_arrow.cc:791:13: error: variable 'n' set but not used [-Werror,-Wunused-but-set-variable]
    int64_t n = 0;
            ^
/Users/willjones/Documents/arrows/arrow/cpp/src/arrow/python/numpy_to_arrow.cc:799:13: error: variable 'n' set but not used [-Werror,-Wunused-but-set-variable]
    int64_t n = 0;
            ^ 

Issue Links

• links to: GitHub Pull Request #12359