[U-Boot] [PATCH] nios2: use gc sections to reduce image size

[Thomas Chou]

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 at wytron.com.tw>
---
 arch/nios2/config.mk |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/nios2/config.mk b/arch/nios2/config.mk
index 793cc43..aba96b3 100644
--- a/arch/nios2/config.mk
+++ b/arch/nios2/config.mk
@@ -31,2 +31,5 @@ PLATFORM_CPPFLAGS += -DCONFIG_NIOS2 -D__NIOS2__
 
 LDSCRIPT ?= $(SRCTREE)/$(CPUDIR)/u-boot.lds
+
+LDFLAGS += --gc-sections
+PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections
-- 
1.7.1.86.g0e460