Only depend on CFG_VERSION in rustc_interface

this avoids having to rebuild the whole compiler on each commit when
`omit-git-hash = false`.

1 files changed, 7 insertions, 9 deletions

diff --git a/compiler/rustc_codegen_ssa/src/lib.rs b/compiler/rustc_codegen_ssa/src/lib.rs
index c3cc17c255b..cdf50bdf1a4 100644
--- a/compiler/rustc_codegen_ssa/src/lib.rs
+++ b/compiler/rustc_codegen_ssa/src/lib.rs
@@ -36,6 +36,7 @@ use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
 use rustc_session::config::{CrateType, OutputFilenames, OutputType, RUST_CGU_EXT};
 use rustc_session::cstore::{self, CrateSource};
 use rustc_session::utils::NativeLibKind;
+use rustc_session::Session;
 use rustc_span::symbol::Symbol;
 use rustc_span::DebuggerVisualizerFile;
 use std::collections::BTreeSet;
@@ -175,11 +176,11 @@ pub struct CodegenResults {
     pub crate_info: CrateInfo,
 }
 
-pub enum CodegenErrors<'a> {
+pub enum CodegenErrors {
     WrongFileType,
     EmptyVersionNumber,
     EncodingVersionMismatch { version_array: String, rlink_version: u32 },
-    RustcVersionMismatch { rustc_version: String, current_version: &'a str },
+    RustcVersionMismatch { rustc_version: String },
 }
 
 pub fn provide(providers: &mut Providers) {
@@ -213,10 +214,9 @@ pub fn looks_like_rust_object_file(filename: &str) -> bool {
 const RLINK_VERSION: u32 = 1;
 const RLINK_MAGIC: &[u8] = b"rustlink";
 
-const RUSTC_VERSION: Option<&str> = option_env!("CFG_VERSION");
-
 impl CodegenResults {
     pub fn serialize_rlink(
+        sess: &Session,
         rlink_file: &Path,
         codegen_results: &CodegenResults,
     ) -> Result<usize, io::Error> {
@@ -225,12 +225,12 @@ impl CodegenResults {
         // `emit_raw_bytes` is used to make sure that the version representation does not depend on
         // Encoder's inner representation of `u32`.
         encoder.emit_raw_bytes(&RLINK_VERSION.to_be_bytes());
-        encoder.emit_str(RUSTC_VERSION.unwrap());
+        encoder.emit_str(sess.cfg_version);
         Encodable::encode(codegen_results, &mut encoder);
         encoder.finish()
     }
 
-    pub fn deserialize_rlink<'a>(data: Vec<u8>) -> Result<Self, CodegenErrors<'a>> {
+    pub fn deserialize_rlink(sess: &Session, data: Vec<u8>) -> Result<Self, CodegenErrors> {
         // The Decodable machinery is not used here because it panics if the input data is invalid
         // and because its internal representation may change.
         if !data.starts_with(RLINK_MAGIC) {
@@ -252,11 +252,9 @@ impl CodegenResults {
 
         let mut decoder = MemDecoder::new(&data[4..], 0);
         let rustc_version = decoder.read_str();
-        let current_version = RUSTC_VERSION.unwrap();
-        if rustc_version != current_version {
+        if rustc_version != sess.cfg_version {
             return Err(CodegenErrors::RustcVersionMismatch {
                 rustc_version: rustc_version.to_string(),
-                current_version,
             });
         }