Auto merge of #7890 - ehuss:fingerprint-log-rustflags, r=Eh2406

Add new/old rustflags to fingerprint log. Follow up to #7888. Due to a conversation with someone I had with Discord who was having trouble determining why something was rebuilding.
rust-lang · Feb 16, 2020 · 5f07972 · 5f07972
2 parents 1fa0f1b + 25275b0
commit 5f07972
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/src/cargo/core/compiler/fingerprint.rs b/src/cargo/core/compiler/fingerprint.rs
@@ -653,7 +653,11 @@ impl Fingerprint {
             bail!("profile configuration has changed")
         }
         if self.rustflags != old.rustflags {
-            bail!("RUSTFLAGS has changed")
+            bail!(
+                "RUSTFLAGS has changed: {:?} != {:?}",
+                self.rustflags,
+                old.rustflags
+            )
         }
         if self.metadata != old.metadata {
             bail!("metadata changed")