This part of the GCC docs covers all of them, AFAIK: https://www.gnu.org/software/libc/manual/html_node/Reserved-Names.html https://www.gnu.org/software/libc/m

This part of the GCC docs covers all of them, AFAIK: https://www.gnu.org/software/libc/manual/html_node/Reserved-Names.html https://www.gnu.org/software/libc/manual/html_node/Reserved-...