--- a/gcc/config/i386/i386-opts.h	Fri Oct 27 22:46:09 2017 +0900
+++ b/gcc/config/i386/i386-opts.h	Thu Oct 25 07:37:49 2018 +0900
@@ -1,5 +1,5 @@
 /* Definitions for option handling for IA-32.
-   Copyright (C) 1988-2017 Free Software Foundation, Inc.
+   Copyright (C) 1988-2018 Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -99,4 +99,24 @@
   SSP_GLOBAL    /* global canary */
 };
 
+enum prefer_vector_width {
+    PVW_NONE,
+    PVW_AVX128,
+    PVW_AVX256,
+    PVW_AVX512
+};
+
+/* This is used to mitigate variant #2 of the speculative execution
+   vulnerabilities on x86 processors identified by CVE-2017-5715, aka
+   Spectre.  They convert indirect branches and function returns to
+   call and return thunks to avoid speculative execution via indirect
+   call, jmp and ret.  */
+enum indirect_branch {
+  indirect_branch_unset = 0,
+  indirect_branch_keep,
+  indirect_branch_thunk,
+  indirect_branch_thunk_inline,
+  indirect_branch_thunk_extern
+};
+
 #endif