Support precompiled deserialize_in_place

serde_derive/src/lib.rs

@@ -78,6 +78,8 @@ extern crate proc_macro2 as proc_macro;
 mod internals;
 
 use proc_macro::TokenStream;
+#[cfg(precompiled)]
+use std::sync::atomic::AtomicBool;
 use syn::DeriveInput;
 
 #[macro_use]
@@ -102,6 +104,9 @@ macro_rules! parse_macro_input {
     };
 }
 
+#[cfg(precompiled)]
+pub static DESERIALIZE_IN_PLACE: AtomicBool = AtomicBool::new(false);
+
 #[cfg_attr(not(precompiled), proc_macro_derive(Serialize, attributes(serde)))]
 pub fn derive_serialize(input: TokenStream) -> TokenStream {
     let mut input = parse_macro_input!(input as DeriveInput);