1 files changed, 15 insertions, 0 deletions
diff --git a/compilerplugins/clang/compat.hxx b/compilerplugins/clang/compat.hxx
index 9e35049e5f75..d4d92a0ad122 100644
--- a/compilerplugins/clang/compat.hxx
+++ b/compilerplugins/clang/compat.hxx
@@ -12,6 +12,9 @@
 
 #include "clang/AST/Decl.h"
 #include "clang/AST/Type.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticIDs.h"
+#include "llvm/ADT/StringRef.h"
 
 // Compatibility wrapper to abstract over (trivial) chanes in the Clang API:
 namespace compat {
@@ -42,6 +45,18 @@ inline clang::QualType getParamType(
 #endif
 }
 
+inline unsigned getCustomDiagID(
+    clang::DiagnosticsEngine const & engine, clang::DiagnosticsEngine::Level L,
+    llvm::StringRef FormatString)
+{
+#if (__clang_major__ == 3 && __clang_minor__ >= 5) || __clang_major__ > 3
+    return engine.getDiagnosticIDs()->getCustomDiagID(
+        static_cast<clang::DiagnosticIDs::Level>(L), FormatString);
+#else
+    return engine.getCustomDiagID(L, FormatString);
+#endif
+}
+
 }
 
 #endif