Compile project and its libray using single GCC command

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I am looking for an assistance with this task:
I have a main project and static library linked to it. 
It all works as expected. 
Since BOTH projects are under development I have to compile the library
first and then the main project.
I know there is a way to automate this process , used it years ago in MFC (
batch files ?) , but do not remember the details. Something related to pre /
post processing. 
Any help wold be greatly appreciated.
Thanks 






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