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I was coding a wxWidgets application many days or a week ago, and after the break returned to work today. Before the break, application built and ran successfully, but today ( without changing any code in the project ) I get this build error : 

obj\Debug\appwx.o||In function `Z8wxStrdupPKc':| C:\wxWidgets-3.0.1\include\wx\wxcrtbase.h|679|undefined reference to `wxCRT_StrdupA(char const*)'|

I am using wxWidgets 3.0.1 & CodeBlocks on a Win 7 system.
Obviously during the break I didn't touch that particular project, so the code is same. I did of course search for the solution and found this thread, as well as this thread. Reading them reminded me that I did change a compiler setting meanwhile -> -std=c++11 for gcc to follow the ISO C++11 standard.
I unchecked that option now, but the build error remains.

What do I need to change in the project so that it will build successfully again like it did the last time I was building it ?

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You must recompile everything (i.e. both wxWidgets and your application) using the same compiler options and if you use configure to build wxWidgets, you also need to ensure it uses the same options as well.

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