Hi,
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I suppose it is somehow possible to ccross-compile the gcc compiler to have it run on the NIOS itself, such as there is a Debian Linux distribution that runs on ARM and can d/l additional packets in source code and compile and install them.
t I don't think anybody would bother to do that for a deeply embedded arch like NIOS, as it does not make much sense.
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For embedded systems, to have their own self-compiler means the War of Independence for PC Imperial.:D But to get the true independence, we must obtain a Thoroughbred gcc. This means to rebuild the 'nios2gcc' on Nios system....:p
Kazu