Question

I have an app, this app uses Glibc, but i want to compile without linking glibc and i need to remove/change code which uses it. Where can i get list of functions defined in glibc?

Thanks!

Answer 1

You need glibc to provide the startup for your typical main entry point (such as setting up the argc, argv into the right places).

You need glibc to call system calls (it provides the “wrappers” around read, write, open, fork, etc.

You need glibc to provide I/O functions such as printf, scanf, getchar, getc, fopen, fclose,etc.

You need glibc to provide typical string functions, such as strcpy, strcat, strtok, strchr, etc.

You need glibc to provide other standard functions, rand, srand, qsort, assert, exit, setjmp, longjmp, etc.

In summary, you probably can’t write any meaningful program without glibc.

Unless of course, you replace glibc with some other library that provides the same functionality. There uclibc which is supposedly a bit more “lightweight”, as it targets embedded systems, where memory is a little more at a premium.