From 877b9fae6fa8f6dfc837b51d2bc758ddb34b1d9e Mon Sep 17 00:00:00 2001
From: Markus Hitter <mah@jump-ing.de>
Date: Wed, 7 Dec 2016 11:21:13 +0100
Subject: [PATCH] ARM: turn on link time optimisation (LTO).

Suggested by @Wurstnase. Apparently gcc got better, so it's
actually an advantage now.

Actually a pretty big advantage. While binary size decreases some
200 bytes, pulse length of the debug LED is a lot shorter
(measured on the scope):

  without LTO:  4.59 us
  with LTO:     3.65 us

That's a 25% performance increase by just turning on a flag!
---
 Makefile-ARM | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile-ARM b/Makefile-ARM
index db85f90..7fc1279 100644
--- a/Makefile-ARM
+++ b/Makefile-ARM
@@ -107,7 +107,7 @@ endif
 CFLAGS += -Wall
 CFLAGS += -Wstrict-prototypes
 CFLAGS += -Os
-#CFLAGS += -flto
+CFLAGS += -flto
 CFLAGS += -ffunction-sections
 CFLAGS += -fdata-sections
 #CFLAGS += -dM -E # To list all predefined macros into the .o file.