AVR was/is not affected by CVE-2017-5753, thus applies as obvious.
Johann
--
gcc/
PR target/86776
* config/avr/avr.cc (TARGET_HAVE_SPECULATION_SAFE_VALUE): Define
to speculation_safe_value_not_needed.
diff --git a/gcc/config/avr/avr.cc b/gcc/config/avr/avr.cc
index c3e0995dfc3..a297f4e092a 100644
--- a/gcc/config/avr/avr.cc
+++ b/gcc/config/avr/avr.cc
@@ -15309,6 +15309,12 @@ avr_float_lib_compare_returns_bool
(machine_mode mode, enum rtx_code)
#undef TARGET_CANONICALIZE_COMPARISON
#define TARGET_CANONICALIZE_COMPARISON avr_canonicalize_comparison
+/* According to the opening comment in PR86772, the following applies:
+ "If the port does not (and never will in the future) need to mitigate
+ against unsafe speculation." */
+#undef TARGET_HAVE_SPECULATION_SAFE_VALUE
+#define TARGET_HAVE_SPECULATION_SAFE_VALUE
speculation_safe_value_not_needed
+
struct gcc_target targetm = TARGET_INITIALIZER;
^L
