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

["Nicholas Clark (Jira)" <lo...@logging.apache.org>]

Nicholas Clark created LOGCXX-551:
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             Summary: 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


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.

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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