Auto merge of #85993 - bjorn3:serde_json, r=wesleywiser

Remove all json handling from rustc_serialize

Json is now handled using serde_json. Where appropriate I have replaced json usage with binary serialization (rmeta files) or manual string formatting (emcc linker arg generation).

This allowed for removing and simplifying a lot of code, which hopefully results in faster serialization/deserialization and faster compiles of rustc itself.

Where sensible we now use serde. Metadata and incr cache serialization keeps using a heavily modified (compared to crates.io) rustc-serialize version that in the future could probably be extended with zero-copy deserialization or other perf tricks that serde can't support due to supporting more than one serialization format.

Note that I had to remove `-Zast-json` and `-Zast-json-noexpand` as the relevant AST types don't implement `serde::Serialize`.

Fixes #40177

See also https://github.com/rust-lang/compiler-team/issues/418

1 files changed, 2 insertions, 2 deletions

diff --git a/src/test/ui-fulldeps/extern-mod-syntax.rs b/src/test/ui-fulldeps/extern-mod-syntax.rs
index a90ab7ac438..230194c5377 100644
--- a/src/test/ui-fulldeps/extern-mod-syntax.rs
+++ b/src/test/ui-fulldeps/extern-mod-syntax.rs
@@ -3,8 +3,8 @@
 #![allow(unused_imports)]
 #![feature(rustc_private)]
 
-extern crate rustc_serialize;
-use rustc_serialize::json::Object;
+extern crate libc;
+use libc::c_void;
 
 pub fn main() {
     println!("Hello world!");