serde: Only executables and rlibs can be compiled with -Z sanitizer

[bbigras]

I'm not able to use the sanitizer with one of my program since it uses serde and serde_derive won't build using -Z sanitizer. I'm able to reproduce with:

#[macro_use]
extern crate serde_derive;

extern crate serde_json;

#[derive(Serialize, Deserialize, Debug)]
struct Point {
    x: i32,
    y: i32,
}

fn main() {
    let point = Point { x: 1, y: 2 };

    // Convert the Point to a JSON string.
    let serialized = serde_json::to_string(&point).unwrap();

    // Prints serialized = {"x":1,"y":2}
    println!("serialized = {}", serialized);

    // Convert the JSON string back to a Point.
    let deserialized: Point = serde_json::from_str(&serialized).unwrap();

    // Prints deserialized = Point { x: 1, y: 2 }
    println!("deserialized = {:?}", deserialized);
}

rustc 1.17.0-nightly (0e7727795 2017-02-19)

$ RUSTFLAGS="-Z sanitizer=thread" cargo run
   Compiling dtoa v0.4.1
   Compiling itoa v0.3.1
   Compiling quote v0.3.13
   Compiling unicode-xid v0.0.4
   Compiling serde v0.9.7
   Compiling num-traits v0.1.36
   Compiling synom v0.11.0
   Compiling syn v0.11.6
   Compiling serde_json v0.9.7
   Compiling serde_codegen_internals v0.13.0
   Compiling serde_derive v0.9.7
error: Only executables and rlibs can be compiled with `-Z sanitizer`

error: aborting due to previous error

error: Could not compile `serde_derive`.

[japaric]

RUSTFLAGS="-Z sanitizer=thread" cargo run

Use --target x86_64-unknown-linux-gnu.

$ RUSTFLAGS="-Z sanitizer=thread" cargo run --target x86_64-unknown-linux-gnu

This is in the README:

Be sure to always pass --target x86_64-unknown-linux-gnu to Cargo or else you'll end up sanitizing the build scripts that Cargo runs or run into compilation error if your crate depends on a dylib.

[bbigras]

It's fine with --target x86_64-unknown-linux-gnu. Sorry about that. I should have known.