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

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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>
This commit is contained in:
Alexey Brodkin 2018-01-25 00:25:12 +03:00
parent 0a097ba54b
commit fac4790491
1 changed files with 2 additions and 1 deletions
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3
arch/arc/config.mk
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@ -51,9 +51,10 @@ PLATFORM_CPPFLAGS += -mcpu=archs
endif endif
PLATFORM_CPPFLAGS += -ffixed-r25 -D__ARC__ -gdwarf-2 -mno-sdata PLATFORM_CPPFLAGS += -ffixed-r25 -D__ARC__ -gdwarf-2 -mno-sdata
PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections
# Needed for relocation # Needed for relocation
LDFLAGS_FINAL += -pie LDFLAGS_FINAL += -pie --gc-sections
# Load address for standalone apps # Load address for standalone apps
CONFIG_STANDALONE_LOAD_ADDR ?= 0x82000000 CONFIG_STANDALONE_LOAD_ADDR ?= 0x82000000