init code

init code

[dreese]

Does gcc currently posses the functionality to do the following?

I would like to have gcc compile in a function that initializes a global variable into the target programs memory space. I need this initialization function to be called before any code is executed from the target program. I need to have gcc do this for every program that it compiles with out being asked. 

Does anyone have any ideas?

Thanks for your time.
Dale Reese

Re: init code

[David Daney]

dreese@vandals.uidaho.edu wrote:
> Does gcc currently posses the functionality to do the following?
> 
> I would like to have gcc compile in a function that initializes a global variable into the target programs memory space. I need this initialization function to be called before any code is executed from the target program. I need to have gcc do this for every program that it compiles with out being asked. 
> 
> Does anyone have any ideas?
> 

Look at: __attribute__((constructor))

http://gcc.gnu.org/onlinedocs/gcc-4.3.0/gcc/Function-Attributes.html

You would have to force the object containing the constructor to be linked to any program where this behavior is desired.

David Daney