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nios2: use gc sections to reduce image size

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Follow the discussion of Charles Manning and Mike Frysinger.
Using gc_sections helps reduce image size.

Configuring for nios2-generic board...
Before,
   text    data     bss     dec     hex filename
 123979    3724   22892  150595   24c43 /tmp/u-boot/u-boot
After,
   text    data     bss     dec     hex filename
 115983    3800   22732  142515   22cb3 /tmp/u-boot/u-boot

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Signed-off-by: Scott McNutt <smcnutt@psyent.com>
This commit is contained in:
Thomas Chou 2010-05-28 12:08:10 +08:00 • committed by Scott McNutt
parent 54841ab50c
commit cb2da50f0f
1 changed files with 3 additions and 0 deletions
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3
arch/nios2/config.mk
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@ -30,3 +30,6 @@ PLATFORM_CPPFLAGS += -DCONFIG_NIOS2 -D__NIOS2__
PLATFORM_CPPFLAGS += -G0
LDSCRIPT ?= $(SRCTREE)/$(CPUDIR)/u-boot.lds
LDFLAGS += --gc-sections
PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections