From 0c87e2e7025140ca6105b7fec2639c78c3cd8109 Mon Sep 17 00:00:00 2001
From: Joel Challis <git@zvecr.com>
Date: Thu, 28 Oct 2021 21:02:22 +0100
Subject: Move LTO logic from common.mk (#14973)

---
 tmk_core/rules.mk | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'tmk_core/rules.mk')

diff --git a/tmk_core/rules.mk b/tmk_core/rules.mk
index 56a331e288..b17f85d375 100644
--- a/tmk_core/rules.mk
+++ b/tmk_core/rules.mk
@@ -82,6 +82,15 @@ endif
 #  -Wall...:     warning level
 #  -Wa,...:      tell GCC to pass this to the assembler.
 #    -adhlns...: create assembler listing
+ifeq ($(strip $(LTO_ENABLE)), yes)
+    ifeq ($(PLATFORM),CHIBIOS)
+        $(info Enabling LTO on ChibiOS-targeting boards is known to have a high likelihood of failure.)
+        $(info If unsure, set LTO_ENABLE = no.)
+    endif
+    CDEFS += -flto
+    CDEFS += -DLTO_ENABLE
+endif
+
 DEBUG_ENABLE ?= yes
 ifeq ($(strip $(SKIP_DEBUG_INFO)),yes)
   DEBUG_ENABLE=no
-- 
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