FW: GNU-GCC cross compiler issue

["suman jha" <suman dot jha at patni 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.
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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