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

• Type: Wish
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.12.1
• Fix Version/s: 0.13.0
• Component/s: Build, Documentation
• Assignee: Robert Middleton
• Reporter: Nicholas Clark
• Created: 31/Jan/22 16:50
• Updated: 15/Apr/22 01:37
• Resolved: 15/Apr/22 01:37

Description

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.

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:

-DSTD_SHARED_MUTEX_FOUND=0

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.