[U-Boot] [PATCH] arc: Eliminate unused code and data with GCC's garbage collector

[Alexey Brodkin]

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 at synopsys.com>
---
 arch/arc/config.mk | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arc/config.mk b/arch/arc/config.mk
index 13676bd0c8e1..a19c188dbcfa 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
+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
-- 
2.14.3