From fe020380b604ea514594360eb77baaccd6533f68 Mon Sep 17 00:00:00 2001
From: Simon John <git@the-jedi.co.uk>
Date: Tue, 11 Oct 2016 15:23:36 +0100
Subject: Changed LTO support check to avr-gcc > 4.9.0 as the 4.8.1 bundled
 with the IDE prior to 1.6.10 doesn't support LTO or plugins. Fixes Issue #456

So essentially LTO support will only be enabled with avr-gcc 4.9.2 which comes with 1.6.10 or later
and Debian, Ubuntu etc; not 4.8.1 which comes with IDE 1.6.9 and a few earlier versions.

Tested with:

 * 1.6.8 (avr-gcc 4.8.1 which doesn't support LTO so uses avr-ar and doesn't set LTO flags)
 * 1.6.12 (avr-gcc 4.9.2 which supports LTO so uses avr-gcc-ar and sets LTO flags)
 * 1.0.5 with Debian avr-gcc 4.9.2 (supports LTO so uses avr-gcc-ar and sets LTO flags)
---
 Arduino.mk | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

(limited to 'Arduino.mk')

diff --git a/Arduino.mk b/Arduino.mk
index 15e242d..133a9a2 100644
--- a/Arduino.mk
+++ b/Arduino.mk
@@ -1032,7 +1032,7 @@ CC_VERNUM = $(shell $(CC) -dumpversion | sed 's/\.//g')
 
 # moved from above so we can find version-dependant ar
 ifndef AR_NAME
-    ifeq ($(shell expr $(CC_VERNUM) '>' 480), 1)
+    ifeq ($(shell expr $(CC_VERNUM) '>' 490), 1)
         AR_NAME      = avr-gcc-ar
     else
         AR_NAME      = avr-ar
@@ -1040,7 +1040,7 @@ ifndef AR_NAME
 endif
 
 ifndef CFLAGS_STD
-    ifeq ($(shell expr $(CC_VERNUM) '>' 480), 1)
+    ifeq ($(shell expr $(CC_VERNUM) '>' 490), 1)
         CFLAGS_STD      = -std=gnu11 -flto -fno-fat-lto-objects
     else
         CFLAGS_STD        =
@@ -1051,7 +1051,7 @@ else
 endif
 
 ifndef CXXFLAGS_STD
-    ifeq ($(shell expr $(CC_VERNUM) '>' 480), 1)
+    ifeq ($(shell expr $(CC_VERNUM) '>' 490), 1)
         CXXFLAGS_STD      = -std=gnu++11 -fno-threadsafe-statics -flto
     else
         CXXFLAGS_STD      =
@@ -1064,11 +1064,11 @@ endif
 CFLAGS        += $(CFLAGS_STD)
 CXXFLAGS      += -fpermissive -fno-exceptions $(CXXFLAGS_STD)
 ASFLAGS       += -x assembler-with-cpp
-ifeq ($(shell expr $(CC_VERNUM) '>' 480), 1)
+ifeq ($(shell expr $(CC_VERNUM) '>' 490), 1)
     ASFLAGS += -flto
 endif
 LDFLAGS       += -$(MCU_FLAG_NAME)=$(MCU) -Wl,--gc-sections -O$(OPTIMIZATION_LEVEL)
-ifeq ($(shell expr $(CC_VERNUM) '>' 480), 1)
+ifeq ($(shell expr $(CC_VERNUM) '>' 490), 1)
     LDFLAGS += -flto -fuse-linker-plugin
 endif
 SIZEFLAGS     ?= --mcu=$(MCU) -C
-- 
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