Calling Global Constructors: Difference between revisions

It is very easy to use these object files in user-space, as the cross-compiler automatically will link them in the right order into the final program. The compiler will, as always, provide <tt>crtbegin.o</tt> and <tt>crtend.o</tt>. Your C library will then provide <tt>crt0.o</tt> (program entry point file), <tt>crti.o</tt>, and <tt>crtn.o</tt>. If you have aan [[OS Specific Toolchain]], you can change the name of the program entry point (normally _start), the path where the compiler searches for the <tt>crt{0,i,n}.o</tt> files, and what files is even used (possibly with other names) and what order, by modifying <tt>STARTFILE_SPEC</tt> and <tt>ENDFILE_SPEC</tt>. When you start creating a user-space, it may well be worth creating an OS Specific Toolchain because it allows you great control over exactly how all this works.