[jira] [Resolved] (ARROW-3110) [C++] Compilation warnings with gcc 7.3.0

["Wes McKinney (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-3110?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wes McKinney resolved ARROW-3110.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 0.11.0

Issue resolved by pull request 2464
[https://github.com/apache/arrow/pull/2464]

> [C++] Compilation warnings with gcc 7.3.0
> -----------------------------------------
>
>                 Key: ARROW-3110
>                 URL: https://issues.apache.org/jira/browse/ARROW-3110
>             Project: Apache Arrow
>          Issue Type: Task
>          Components: C++
>    Affects Versions: 0.10.0
>            Reporter: Antoine Pitrou
>            Assignee: Antoine Pitrou
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.11.0
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> This is happening when building in release mode:
> {code}
> ../src/arrow/python/python_to_arrow.cc: In function 'arrow::Status arrow::py::detail::BuilderAppend(arrow::BinaryBuilder*, PyObject*, bool*)':
> ../src/arrow/python/python_to_arrow.cc:388:56: warning: 'length' may be used uninitialized in this function [-Wmaybe-uninitialized]
>    if (ARROW_PREDICT_FALSE(builder->value_data_length() + length > kBinaryMemoryLimit)) {
>                                                         ^
> ../src/arrow/python/python_to_arrow.cc:385:11: note: 'length' was declared here
>    int32_t length;
>            ^~~~~~
> In file included from ../src/arrow/python/serialize.cc:32:0:
> ../src/arrow/builder.h: In member function 'arrow::Status arrow::py::SequenceBuilder::Update(int64_t, int8_t*)':
> ../src/arrow/builder.h:413:5: warning: 'offset32' may be used uninitialized in this function [-Wmaybe-uninitialized]
>      raw_data_[length_++] = val;
>      ^~~~~~~~~
> ../src/arrow/python/serialize.cc:90:13: note: 'offset32' was declared here
>      int32_t offset32;
>              ^~~~~~~~
> {code}



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