pub const BUILTINS: &str = "librucc_builtins.a";Expand description
Our own runtime library, which every one of the three lines below carries.
Named once because three callers ask about it by name: the line that puts it on,
crate::argv::argv when -fno-builtins-lib asks for it to be left off, and the driver that
goes looking for the file. A second spelling of the name anywhere is a flag that stops working
the day the first one is renamed.
Where the file is, is not this crate’s answer and used to be. Every line below named it inside
the sysroot, as sysroot.lib().join(BUILTINS), and nothing ever put it there: it is this
compiler’s own output for the target rather than anything the platform ships, cargo xtask builtins writes it beside the compiler, and a sysroot fetched from a release will never hold
it. So the lines take the path from whoever built them, which is the driver, and this constant
is the name alone. tamnd/rucc#1514.