From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Sun, 27 Oct 2019 21:32:59 +0000 (+0100)
Subject: mtd: Activate LTO compile option
X-Git-Tag: v19.07.0-rc2~5
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=5cb845ebfedb57716d8694026b9d3f3a2638d2bf;p=openwrt%2Fstaging%2Fhauke.git

mtd: Activate LTO compile option

This decreases the size of the mtd application by 25% on MIPS BE.

old:
20,597 /sbin/mtd

new:
16,421 /sbin/mtd

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit 1eb34b7287ed97ad1e2ae60a436babbb5c68076f)
---

diff --git a/package/system/mtd/Makefile b/package/system/mtd/Makefile
index c307555436..17df3bc475 100644
--- a/package/system/mtd/Makefile
+++ b/package/system/mtd/Makefile
@@ -36,7 +36,8 @@ endef
 target=$(firstword $(subst -, ,$(BOARD)))
 
 MAKE_FLAGS += TARGET="$(target)"
-TARGET_CFLAGS := $(TARGET_CFLAGS) -Dtarget_$(target)=1 -Wall
+TARGET_CFLAGS += -Dtarget_$(target)=1 -Wall -flto
+TARGET_LDFLAGS += -flto=jobserver
 
 ifdef CONFIG_MTD_REDBOOT_PARTS
   MAKE_FLAGS += FIS_SUPPORT=1