diff --git a/src/librustc_llvm/diagnostic.rs b/src/librustc_llvm/diagnostic.rs
index c5cdf656692..e73c570ed82 100644
--- a/src/librustc_llvm/diagnostic.rs
+++ b/src/librustc_llvm/diagnostic.rs
@@ -121,6 +121,7 @@ impl InlineAsmDiagnostic {
 pub enum Diagnostic {
     Optimization(OptimizationDiagnostic),
     InlineAsm(InlineAsmDiagnostic),
+    PGO(DiagnosticInfoRef),
 
     /// LLVM has other types that we do not wrap here.
     UnknownDiagnostic(DiagnosticInfoRef),
@@ -160,6 +161,10 @@ impl Diagnostic {
                 Optimization(OptimizationDiagnostic::unpack(OptimizationFailure, di))
             }
 
+            Dk::PGOProfile => {
+                PGO(di)
+            }
+
             _ => UnknownDiagnostic(di),
         }
     }
diff --git a/src/librustc_llvm/ffi.rs b/src/librustc_llvm/ffi.rs
index 25506f6a86e..1271773fa02 100644
--- a/src/librustc_llvm/ffi.rs
+++ b/src/librustc_llvm/ffi.rs
@@ -322,6 +322,7 @@ pub enum DiagnosticKind {
     OptimizationRemarkAnalysisAliasing,
     OptimizationRemarkOther,
     OptimizationFailure,
+    PGOProfile,
 }
 
 /// LLVMRustArchiveKind
diff --git a/src/librustc_trans/back/write.rs b/src/librustc_trans/back/write.rs
index 2a8d280ee26..99558652d69 100644
--- a/src/librustc_trans/back/write.rs
+++ b/src/librustc_trans/back/write.rs
@@ -498,8 +498,13 @@ unsafe extern "C" fn diagnostic_handler(info: DiagnosticInfoRef, user: *mut c_vo
                                                 opt.message));
             }
         }
-
-        _ => (),
+        llvm::diagnostic::PGO(diagnostic_ref) => {
+            let msg = llvm::build_string(|s| {
+                llvm::LLVMRustWriteDiagnosticInfoToString(diagnostic_ref, s)
+            }).expect("non-UTF8 PGO diagnostic");
+            diag_handler.note_without_error(&msg);
+        }
+        llvm::diagnostic::UnknownDiagnostic(..) => {},
     }
 }
 
diff --git a/src/rustllvm/RustWrapper.cpp b/src/rustllvm/RustWrapper.cpp
index a5644d6f9e2..970c1c6a011 100644
--- a/src/rustllvm/RustWrapper.cpp
+++ b/src/rustllvm/RustWrapper.cpp
@@ -1021,6 +1021,7 @@ enum class LLVMRustDiagnosticKind {
   OptimizationRemarkAnalysisAliasing,
   OptimizationRemarkOther,
   OptimizationFailure,
+  PGOProfile,
 };
 
 static LLVMRustDiagnosticKind toRust(DiagnosticKind Kind) {
@@ -1043,6 +1044,8 @@ static LLVMRustDiagnosticKind toRust(DiagnosticKind Kind) {
     return LLVMRustDiagnosticKind::OptimizationRemarkAnalysisFPCommute;
   case DK_OptimizationRemarkAnalysisAliasing:
     return LLVMRustDiagnosticKind::OptimizationRemarkAnalysisAliasing;
+  case DK_PGOProfile:
+    return LLVMRustDiagnosticKind::PGOProfile;
   default:
     return (Kind >= DK_FirstRemark && Kind <= DK_LastRemark)
                ? LLVMRustDiagnosticKind::OptimizationRemarkOther