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where is gccmain

Hi,
    When I assemble a simple C program, there is a call to __gccmain. Does any one know where this is located. Is it somewhere in libgcc.a? Also does this __gccmain call the _init function in order to call constructor of static objects and also registers _fini with __atexit to call their destructors or does this calling of _init and registering of _fini has to be done in crt0.S as it is done in the default crt0.S build for newlib. I am using a gcc toolchain for xscale. The reason I would like to know is I am trying to get C++ programs to run on an OS less system. 

    I would really appreciate you answers. 

Thanks
Vish


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