commit 887ca45ca78c36834c5f8cf8fbe245ee95237451
author Alexey Brodkin <abrodkin@synopsys.com> Thu Jan 25 00:25:12 2018 +0300
committer Alexey Brodkin <abrodkin@synopsys.com> Wed Mar 21 16:21:34 2018 +0300
tree 9f1705cf5371ee9bb240f5352c63337fb3ae734f
parent b273908ff888f1edd8bda2502b1d2bda0d463992

arc: Eliminate unused code and data with GCC's garbage collector

Finally GCC's garbage collector works on ARC so let's use it.
That's what I may see for HSDK:

Before:
   text	   data	    bss	    dec	    hex	filename
 290153	  10068	 222616	 522837	  7fa55	u-boot

After:
   text	   data	    bss	    dec	    hex	filename
 261999	   9460	 222360	 493819	  788fb	u-boot

Overall ~5% of memory footprint saved.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

arch/arc/config.mk

diff --git a/arch/arc/config.mk b/arch/arc/config.mk
index 3ed0c28..d040454 100644
--- a/arch/arc/config.mk
+++ b/arch/arc/config.mk
@@ -51,9 +51,10 @@
 endif
 
 PLATFORM_CPPFLAGS += -ffixed-r25 -D__ARC__ -gdwarf-2 -mno-sdata
+PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections
 
 # Needed for relocation
-LDFLAGS_FINAL += -pie
+LDFLAGS_FINAL += -pie --gc-sections
 
 # Load address for standalone apps
 CONFIG_STANDALONE_LOAD_ADDR ?= 0x82000000