[jira] [Resolved] (LOGCXX-558) Prevent MSVC compilation warnings "needs to have dll-interface"

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

     [ https://issues.apache.org/jira/browse/LOGCXX-558?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Middleton resolved LOGCXX-558.
-------------------------------------
    Resolution: Fixed

> Prevent MSVC compilation warnings "needs to have dll-interface"
> ---------------------------------------------------------------
>
>                 Key: LOGCXX-558
>                 URL: https://issues.apache.org/jira/browse/LOGCXX-558
>             Project: Log4cxx
>          Issue Type: Improvement
>            Reporter: Stephen Webb
>            Priority: Minor
>             Fix For: 1.0.0
>
>
> The private data of classes do not prevent Microsoft compiler warning messages.
>  
> As the private data is inaccessible by client application it should be safe to ignore the warning. This can be done using a macro 
> ```
> #if _WIN32
> #define LOG4CXX_DECLARE_PRIVATE_MEMBER_PTR(T, V) \
> __pragma( warning( push ) ) \
> __pragma( warning( disable : 4251 ) ) \
>     struct T; std::unique_ptr<T> V; \
> __pragma( warning( pop ) )
> #else
> #define LOG4CXX_DECLARE_PRIVATE_MEMBER_PTR(T, V) struct T; std::unique_ptr<T> V;
> #endif /* WIN32 */
> ```



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