Support clippy-driver as rustc

[yaahc]

The Preface

There is some vague talk of maybe someday integrating clippy-driver into cargo build and cargo check rust-lang/cargo#7382, so I went and tried to test if we could just use clippy-driver as a drop in replacement for rustc under cargo build and sccache did not play nicely with it.

The Problem

sccache flat out errors out if clippy-driver is passed in the place of rustc

The Fix

@mystor suggested that someone fix it @

sccache/src/compiler/compiler.rs

Line 842 in 6371211

let rustc_vv = if filename.to_string_lossy().to_lowercase() == "rustc" {

to work with clippy-driver.

[luser]

I don't have clippy-driver installed locally. If you run clippy-driver -vV what does it output? sccache needs some way to determine whether the compiler is rustc or a C/C++ compiler.

[yaahc]

It's the same output as rustc. For more details and entertainment check out

rust-lang/libc#1544

--version mentions it is clippy, with --vV clippy pretends to be rustc