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https://issues.apache.org/jira/browse/LOGCXX-533?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Middleton closed LOGCXX-533.
-----------------------------------
Resolution: Resolved
> cannot use log4cxx header files with clang++
> --------------------------------------------
>
> Key: LOGCXX-533
> URL: https://issues.apache.org/jira/browse/LOGCXX-533
> Project: Log4cxx
> Issue Type: Bug
> Components: Core
> Affects Versions: 0.11.0
> Environment: Windows 10/ Visual Studio 2019/clang++
> Reporter: Sergei Delov
> Priority: Major
> Fix For: 0.11.0
>
>
> I initially reported the problem for vcpkg log4cxx package:
> [https://github.com/microsoft/vcpkg/issues/19730]
> Here's the report text:
> ---
> [log4cxx] failure to compile application with clang on Windows/VC2019
> We have an application that uses log4cxx.
> When I compile with clang on Windows VC2019 I observe the following error:
> _[...]_
> _In file included from
> C:\vcpkg\installed\x64-windows\include\log4cxx/logger.h:30:_
> _In file included from
> C:\vcpkg\installed\x64-windows\include\log4cxx/helpers/appenderattachableimpl.h:27:_
> _In file included from
> C:\vcpkg\installed\x64-windows\include\log4cxx/spi/appenderattachable.h:30:_
> _C:\vcpkg\installed\x64-windows\include\log4cxx\appender.h(140,1): error :
> explicit instantiation of 'allocator' not in a namespace enclosing 'std'_
> _LOG4CXX_LIST_DEF(AppenderList, AppenderPtr);_
> _^_
> _C:\vcpkg\installed\x64-windows\include\log4cxx\log4cxx.h(91,45): note:
> expanded from macro 'LOG4CXX_LIST_DEF'_
> _extern template class LOG4CXX_EXPORT std::allocator;_
> _^_
> _C:\Program Files (x86)\Microsoft Visual
> Studio\2019\Professional\VC\Tools\MSVC\14.27.29110\include\iosfwd(167,7):
> note: explicit instantiation refers here_
> _class allocator;_
> _^_
> I found this error appears because clang compiler included with Visual Studio
> has _MSC_VER macro defined.
> (Intel icx compiler also has _MSC_VER macro defined on Windows)
> The simple fix worked for me for both compilers:
> (log4cxx.h, line 81)
> {code:java}
> #elif defined(_MSC_VER) && !defined(__clang__) &&
> !defined(LOG4CXX_STATIC){code}
> I didn't try to compile with LOG4CXX_STATIC defined, though.
> ---
> vcpkg folks recommended to address "upstream" team.
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