Hi,
I am building a complex application for AT91SAM9RL target. Here is a brief description of my system:
- CodeSourcery arm-none-eabi compiler
- AT91SAM9RL64 IC on custom board (similar to AT91SAM9RL-EK)

I successfully run a simple graphical application on my system, written in pure C.
I prefer to avoid using third party libraries and systems (with their own licenses), even well knowing the efforts needed to build a functional gui framework library for my application. But I think that the best approach is to build it in C++ code, since its virtualization capabilities are a big help in such huge projects.

This means I have to update the startup and the linker scripts provided by at91 library in order to support the C++ library startup code and the ctors/dtors related to the classes.

In other words, I need to add in the linker script the .init and the .fini sections, and in the startup code the ctor/dtor callers.

I found sample code for the SAM7 family, but the scripts are completely different. If it is possible, I prefer to try to understand and apply the differences between original Atmel files and C++ requirements.

I don't know well the linker keywords and the code sections that needs to be worked out. Is there anyone that was able to run C++ code with the AT91SAM9 family?

Alternatively, could you explain me the code organization (where to place .init and .fini sections) and other differences between plain C initialization and C++ startup, and the method to be applied?

Any help is really appreciated.

See how Rowley does it
http://www.rowley.co.uk/arm/

I found this document, and I think it is very clear.
I agree with the author, that says:
"While many online and printed resources focus on building and installing the GNU toolchain, it is quite hard to find a comprehensive example of using GNU C/C++ toolchain for bare metal ARM systems [...]. And even if you do find such an example, you most likely won't know WHY things are done the particular way"

I think that sharing this link could be useful for others:
http://www.state-machine.com/arm/Buildi ... th_GNU.pdf

I have just some concern about remapping (that is done once by the ROM bootloader, and then I have to setup IRQ and FIQ...), but probably I need to play with the code...

[quote="kk33"]I found this document, and I think it is very clear.
I agree with the author, that says:
"While many online and printed resources focus on building and installing the GNU toolchain, it is quite hard to find a comprehensive example of using GNU C/C++ toolchain for bare metal ARM systems [...]. And even if you do find such an example, you most likely won't know WHY things are done the particular way"[/quote]
that's the reason why I use a commercial compiler/IDE.
regards