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https://issues.apache.org/jira/browse/IMPALA-5031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16692455#comment-16692455
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ASF subversion and git services commented on IMPALA-5031:
---------------------------------------------------------
Commit 8f151d0e63aa5f3548e283fadcaf801456cb3354 in impala's branch
refs/heads/master from [~jbapple]
[ https://git-wip-us.apache.org/repos/asf?p=impala.git;h=8f151d0 ]
IMPALA-5031: Zero-length arrays are undefined behavior
This patch prevents the creation of a zero-length array. This is
illegal under paragraph 5 of §6.7.5.2 ("Array declarators") of the C99
standard, which reads:
If the size is an expression that is not an integer constant
expression: if it occurs in a declaration at function prototype
scope, it is treated as if it were replaced by *; otherwise, each
time it is evaluated it shall have a value greater than zero.
Variable-length arrays are not part of C++14, but they are a common
compiler extension and are available in both clang++ and g++. That the
semantics of missing features are the same is implied by [intro.scope]
in the C++14 standard, which reads:
C++ is a general purpose programming language based on the C
programming language as described in ISO/IEC 9899:1999 Programming
languages — C (hereinafter referred to as the C standard).
Change-Id: I93f7d0b0506e4b6a2ff3303477d887a428431f96
Reviewed-on: http://gerrit.cloudera.org:8080/11811
Reviewed-by: Impala Public Jenkins <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
> UBSAN clean and method for testing UBSAN cleanliness
> ----------------------------------------------------
>
> Key: IMPALA-5031
> URL: https://issues.apache.org/jira/browse/IMPALA-5031
> Project: IMPALA
> Issue Type: Task
> Components: Backend, Infrastructure
> Affects Versions: Impala 2.9.0
> Reporter: Jim Apple
> Assignee: Jim Apple
> Priority: Minor
>
> http://releases.llvm.org/3.8.0/tools/clang/docs/UndefinedBehaviorSanitizer.html
> builds are supported after https://gerrit.cloudera.org/#/c/6186/, but
> Impala's test suite triggers many errors under UBSAN. Those errors should be
> fixed and then there should be a way to run the test suite under UBSAN and
> fail if there were any errors detected.
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