From: Alexey Brodkin <abrodkin@synopsys.com>
Date: Wed, 24 Jan 2018 21:25:12 +0000 (+0300)
Subject: arc: Eliminate unused code and data with GCC's garbage collector
X-Git-Tag: v2018.05-rc1~10^2~23
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=fac4790491f69b29755d92db2cad508849573ff7;p=platform%2Fkernel%2Fu-boot.git

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>
---

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 @@ PLATFORM_CPPFLAGS += -mcpu=archs
 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