RE: GNU-GCC cross compiler issue

["Dhananjay R. Deshpande" <dhananjayd at kpit dot com>]

> Hello Everyone,
> 
> We are trying to port an embedded system code from microtec 
> compiler to gnu
> gcc. For testing purpose we are using a debugger and running 
> the code in
> RAM.
> 
> In that process We are facing problem in initializing the 
> global and static
> vaiables.
> 
> We have implemeneted the following steps for the same:
> 1. We have included crt0.o file in our linker script.
> 2. We have implemented start function which calls our main function.
> 3. we have verified that GNU compiler inserts a call to 
> __main function in
> the starting of our main function ( Using Assembely code).
> 4. We have implemented the code to copy the .data section 
> (initialized data
> section) to the ram.

Removing this step (4) while debugging program in GDB may solve your problem. 

> 5. If we allow gnu to use the internal __main function it 
> gives an error at
> run time in do_global_ctors function. To avoid this problem, we have
> implemented an empty __main function, which is called from 
> our main(). But
> now that, we have written our own __main function, the global 
> and static
> variables are not being initialized as it is empty.
> 6. Please note that the complete source is written in 'C and 
> we have defined
> any specific data initialization routine.
> 
> Hope to hear from anyone of you soon..
> Thanks and Regards,
> Suman Jha
> 
> 
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