[ARROW-13819] [C++] Build fails with "'subseconds' may be used uninitialized in this function"

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 6.0.0
• Component/s: C++
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/29445
• Assignee: David Li
• Reporter: David Li
• Created: 31/Aug/21 14:57
• Updated: 11/Jan/23 08:35
• Resolved: 31/Aug/21 16:34

Description

Started happening after updating my Conda environment.

In file included from /home/lidavidm/Code/upstream/arrow-13812/cpp/src/arrow/util/value_parsing.cc:18:
/home/lidavidm/Code/upstream/arrow-13812/cpp/src/arrow/util/value_parsing.h: In member function 'virtual bool arrow::internal::{anonymous}::ISO8601Parser::operator()(const char*, size_t, arrow::TimeUnit::type, int64_t*) const':
/home/lidavidm/Code/upstream/arrow-13812/cpp/src/arrow/util/value_parsing.h:532:29: error: 'subseconds' may be used uninitialized in this function [-Werror=maybe-uninitialized]
  532 |           *out = subseconds * 10;
      |                  ~~~~~~~~~~~^~~~
/home/lidavidm/Code/upstream/arrow-13812/cpp/src/arrow/util/value_parsing.h:527:14: note: 'subseconds' was declared here
  527 |     uint32_t subseconds;
      |              ^~~~~~~~~~

Issue Links

• links to: GitHub Pull Request #11039