[ARROW-13600] [C++] Maybe uninitialized warnings

• 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/29244
• Assignee: Keith Kraus
• Reporter: Keith Kraus
• Created: 10/Aug/21 22:06
• Updated: 11/Jan/23 08:34
• Resolved: 16/Aug/21 01:51

Description

Building CXX object src/arrow/CMakeFiles/arrow_objlib.dir/compute/exec/key_hash.cc.o
/home/keith/git/arrow/cpp/src/arrow/compute/exec/key_hash.cc: In static member function 'static void arrow::compute::Hashing::hash_varlen_helper(uint32_t, const uint8_t*, uint32_t*)':
/home/keith/git/arrow/cpp/src/arrow/compute/exec/key_hash.cc:202:16: warning: 'last_stripe' may be used uninitialized in this function [-Wmaybe-uninitialized]
  202 |       uint32_t lane = reinterpret_cast<const uint32_t*>(last_stripe)[j];
      |                ^~~~

Building CXX object src/arrow/CMakeFiles/arrow_objlib.dir/tensor.cc.o
/home/keith/git/arrow/cpp/src/arrow/tensor.cc: In member function 'arrow::Result<long int> arrow::Tensor::CountNonZero() const':
/home/keith/git/arrow/cpp/src/arrow/tensor.cc:337:18: warning: '*((void*)& counter +8)' may be used uninitialized in this function [-Wmaybe-uninitialized]
  337 |   NonZeroCounter counter(*this);

Issue Links

• links to: GitHub Pull Request #10907