Re: [Log4cplus-devel] linking error

[Václav Z. <vha...@gm...>]

On 03/03/2014 05:59 PM, drkmkzs wrote:
> Thank for help, 
> 
> But i was explicitely linking with lib4cplusU DLL when linking my
> application with my static lib. 
> 
> Indeed my error was to forget to add some cmake definition for unicode
> in my cmake, as in the examples...
> 
> So after that, it was ok except my app didn't compile, when logging some
> trace using glibmm methods... 
> 
> So for the moment, I have recompiled log4cplus without unicode support,
> removed the definitions in my cmake, and all compile well  (except for
> some bad things from my side). What is the unicode option for ? I guess
> to treat specific type as unicode compliant types ? 

The Unicode option serves the same purpose as the UNICODE (and _UNICODE)
preprocessor symbols do in Windows headers. They switch between char and
wchar_t in the API. When it is not defined, all the interfaces take
chars and std::strings. When it is defined, all the interfaces take
wchar_ts and std::wstrings.

> 
> 
> 2014-02-28 19:36 GMT+01:00 Václav Zeman <vha...@gm...
> <mailto:vha...@gm...>>:
> 
>     On 02/28/2014 06:42 PM, drkmkzs wrote:
>     > Hello,
>     >
>     > I'm trying to use log4cplus on windows7, with MinGW, but I am
>     > expericencing some problems ...
>     >
>     > I tried the 1.1.3-rc1 and 1.1.2, it has the same behaviour.
>     >
>     > Compilation of log4cplus is OK with Cmake, i have my
>     > liblog4cplusU.dll, so far, cool :)
>     >
>     > In my app i create a static lib that links to the liblog4cplusU.dll,
>     > it's ok.
>     >
>     > But when my exe tries to link with my static library, i have some
>     > error "undefined reference to
>     > `_imp___ZN9log4cplus6Logger11getInstanceERKSs'" I have checked that
>     > my CmakeList of my exe has correct link and libraries directory
>     > specified ...
>     >
>     > I have read some thread :
>     >
>     http://stackoverflow.com/questions/2848556/c-project-compiles-as-static-lib-fails-linker-error-as-dynamic-lib-why
>     >
>     >  I tried to add definitions in my Cmake ( LOG4CPLUS_BUILD_DLL,
>     > log4cplus_EXPORTS, DLL_EXPORT) , but it didn't change anything ....
>     >
>     > Am I missing anything ?
> 
>     I suspect that when you are linking your static library to your
>     executable, it does not pull in the dependency on the log4cplus DLL
>     import library. Try linking your executable specifically to
>     liblog4cplusU.a, or whatever is the correct log4cplus DLL import library
>     file name.

-- 
VZ