Index: lib/Frontend/InitPreprocessor.cpp
===================================================================
--- lib/Frontend/InitPreprocessor.cpp
+++ lib/Frontend/InitPreprocessor.cpp
@@ -587,12 +587,12 @@
                       "\"" CLANG_VERSION_STRING " "
                       + getClangFullRepositoryVersion() + "\"");
   if (!LangOpts.MSVCCompat) {
-    // Currently claim to be compatible with GCC 4.2.1-5621, but only if we're
+    // Currently claim to be compatible with GCC 8.2, but only if we're
     // not compiling for MSVC compatibility
     Builder.defineMacro("__GNUC_MINOR__", "2");
-    Builder.defineMacro("__GNUC_PATCHLEVEL__", "1");
-    Builder.defineMacro("__GNUC__", "4");
-    Builder.defineMacro("__GXX_ABI_VERSION", "1002");
+    Builder.defineMacro("__GNUC_PATCHLEVEL__", "0");
+    Builder.defineMacro("__GNUC__", "8");
+    Builder.defineMacro("__GXX_ABI_VERSION", "1013");
   }
 
   // Define macros for the C11 / C++11 memory orderings