On Sun, Apr 12, 2020 at 9:06 AM William Tambe <tambewilliam@xxxxxxxxx> wrote: > I can hardly find examples on how to use startfile_prefixes. Currently > when running gcc as follow: > arch-elf-gcc -v test.c > > I get the following excerpt showing how gcc looks for includes: You have the source code. You can find a lot of info by using grep to search for obvious things, like /usr/include for instance, and then follow the code to see where it takes you. But include files are handled differently than startfiles. This is a different question than the previous one. See cppdefault.c. It isn't a good idea to try to change this. Stuff will break. See also include_prefixes in gcc.c. Jim