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https://issues.apache.org/jira/browse/MESOS-6895?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15811709#comment-15811709
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Benjamin Bannier commented on MESOS-6895:
-----------------------------------------
Not supporting this construct seems [intentional or a documented
limitation|https://github.com/llvm-mirror/clang/blob/2a3dc33f7eb936f76ea1e98154f459fa468b78c3/test/CXX/temp/temp.decls/temp.friend/p5.cpp#L63-L72].
> Loop uses dependent nested names for friend declaration which isn't supported
> by recent clang
> ---------------------------------------------------------------------------------------------
>
> Key: MESOS-6895
> URL: https://issues.apache.org/jira/browse/MESOS-6895
> Project: Mesos
> Issue Type: Bug
> Components: libprocess
> Affects Versions: 1.2.0
> Reporter: Benjamin Bannier
> Assignee: Jan Schlicht
> Labels: mesosphere
>
> https://reviews.apache.org/r/54358/ ({{bbb4058d60}}) introduced
> {{ControlFlow}} for {{process::loop}}. Here a dependent nested name specifier
> is used in a friend declaration which is not supported by recent clang.
> {code}
> In file included from
> ../../../3rdparty/libprocess/src/tests/loop_tests.cpp:20:
> /private/tmp/mesos.master/3rdparty/libprocess/include/process/loop.hpp|214
> col 32| warning: dependent nested name specifier 'ControlFlow<U>::' for
> friend class declaration is not supported; turning off access control for
> 'ControlFlow' [-Wunsupported-friend]
> friend class ControlFlow<U>::Continue;
> ~~~~~~~~~~~~~~~~^
> /private/tmp/mesos.master/3rdparty/libprocess/include/process/loop.hpp|216
> col 32| warning: dependent nested name specifier 'ControlFlow<U>::' for
> friend class declaration is not supported; turning off access control for
> 'ControlFlow' [-Wunsupported-friend]
> friend class ControlFlow<U>::Break;
> ~~~~~~~~~~~~~~~~^
> {code}
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