[jira] [Assigned] (LOGCXX-551) CMake documented build option for Boost vs C++17 Implementation for shared_mutex

["Robert Middleton (Jira)" <lo...@logging.apache.org>]

     [ https://issues.apache.org/jira/browse/LOGCXX-551?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Middleton reassigned LOGCXX-551:
---------------------------------------

    Assignee: Robert Middleton

> CMake documented build option for Boost vs C++17 Implementation for shared_mutex
> --------------------------------------------------------------------------------
>
>                 Key: LOGCXX-551
>                 URL: https://issues.apache.org/jira/browse/LOGCXX-551
>             Project: Log4cxx
>          Issue Type: Wish
>          Components: Build, Documentation
>    Affects Versions: 0.12.1
>            Reporter: Nicholas Clark
>            Assignee: Robert Middleton
>            Priority: Minor
>             Fix For: 0.13.0
>
>
> There was a recent approach to detecting if boost' implementation is needed, but I feel that it is not succinct and cannot be when it comes to linker issues. Referencing PR: [https://github.com/apache/logging-log4cxx/pull/107.|https://github.com/apache/logging-log4cxx/pull/107]
> I have large applications that use shared_mutex, but require boost' implementation as not all components linked are able to use C+\+17 implementation at this time. A problem occurs during linkage when log4cxx is built using C+\+17's implementation but our other component is built using boost' implementation.
>  
> *Workaround:*
> We currently can force cmake into using Boost' implementation by passing:
> {code:java}
> -DSTD_SHARED_MUTEX_FOUND=0{code}
> This isn't a documented 'feature'. I would like a documented approach to this. If -DSTD_SHARED_MUTEX_FOUND=0 is what we should use for this feature request, then it should be documented as such. I am putting forth this issue as current usage is not documented as supported and thus I suspect it may be lost in future commits.



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