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From "Jim Apple (Code Review)" <ger...@cloudera.org>
Subject [Impala-ASF-CR] IMPALA-3200 (buffer pool): warn if Status is ignored
Date Fri, 28 Oct 2016 20:45:21 GMT
Jim Apple has posted comments on this change.

Change subject: IMPALA-3200 (buffer pool): warn if Status is ignored
......................................................................


Patch Set 2:

(1 comment)

http://gerrit.cloudera.org:8080/#/c/4878/2/be/src/bufferpool/buffer-allocator.h
File be/src/bufferpool/buffer-allocator.h:

PS2, Line 38: MUST_USE(Status)
> I guess we'd have to wait for C++17, where in the link Tim sent (http://en.
Good point!

I guess we could pass "c++1z" rather than "c++14", but we might also need to upgrade to a
newer gcc in the toolchain:

https://gcc.gnu.org/projects/cxx-status.html#cxx1z

Another idea is to switch to clang for all builds. I tested it, and clang allows this attribute
on types:

    struct[[gnu::warn_unused_result]] Foo {
      int bar;
    };

    Foo Baz() { return {11}; }

    int main() {
      Baz();
      const auto qux = Baz();                                                            
                          
      return qux.bar;
    }

GCC (4.9.2) warns about using the attribute in the wrong place. Clang (3.8.0-p1) warns about
the unused return value from the Baz call on the first line of main.


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Gerrit-MessageType: comment
Gerrit-Change-Id: I8c26e7532b5f2c7fe167accc73179e8b72b192bc
Gerrit-PatchSet: 2
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Tim Armstrong <tarmstrong@cloudera.com>
Gerrit-Reviewer: Dan Hecht <dhecht@cloudera.com>
Gerrit-Reviewer: Jim Apple <jbapple@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <tarmstrong@cloudera.com>
Gerrit-HasComments: Yes

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