What happens when you type gcc main.c?
What is the GCC?
GCC is a shortcut of ‘GNU Compiler Collection’ its’s produced by GNU project and it compiles many programming languages which : C , C++ … for a linux and GNU project so to compile a C file for example we use the command gcc filename just like this
What happens when you type gcc main.c?
first (1) prepocessing:
when you type gcc main.c the compiler start interepting lines of the file main.c by that way :
it delete the comments then include codes from header (exactly from the source file)
second(2) compilation:
the output passe to compilation and gcc generates assembly code
third(3) assembly:
the assembler convert assembly code to binary code so that the computer can interpret it
fourth (4) linking :
in this step the compiler links the code with a runtime library and accept the main.o as an input and since we didn’t use any option (-o -s ..) the executable file will be saved in the default file a.out
Finally
we can execute the saved file just by typing ./a.out
