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Precompiled header files

Hello forum,
I want to take use of precompiled header files in my project. My project is split into two parts. A library part and an application part.

The application part is using the library part by including a single header file called library.hpp. library.hpp contains a ton of includes.

I want to create a pch file out of library.hpp and force the ARM compiler to use that instead of recompiling each header file over and over again.
My problem is that I don't get uVision3 configured in a way that this pch file is properly created.

Here is what I did so far:
- create a cpp file called library.cpp
- configured the library.cpp C/C++ options with --create_pch=library.pch
- configured the overall project C/C++ options with --use_pch=library.pch

When I compile the project the library.pch is created but for each cpp file that is processed the compiler outputs a warning that the pch file has been created with compiler options different from current options.

Please can you give me a hint what I am doing wrong or direct me to any tutorials, sample projects?
I am using Cortex-M3 on ARM-MDK4.0 with uVision 3.9
Thanks a lot in advance and best regards
Jan

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