updates #2577.

For the epiphany_sim BSP variant without this option sample
executables sizes were as follows:

   text    data     bss           dec             hex   filename
 198728    1792 16576900        16777420        10000cc ticker.exe
  74136    1148 16702144        16777428        10000d4 minimum.exe
 839480    7892 15930052        16777424        10000d0 cxx_iostream.exe
 957640    6160 15813636        16777436        10000dc fileio.exe
 332904    2644 16441920        16777468        10000fc capture.exe
 214176    1892 16561344        16777412        10000c4 nsecs.exe
 291112    2208 16484100        16777420        10000cc paranoia.exe
 312096    2208 16463108        16777412        10000c4 cdtest.exe
 190888    1792 16584772        16777452        10000ec base_sp.exe
 196336    1824 16579268        16777428        10000d4 unlimited.exe
 195344    1768 16580356        16777468        10000fc hello.exe

For the epiphany_sim BSP variant with this option sample executables
sizes were as follows:

   text    data     bss           dec             hex   filename
 187784    1752 16587908        16777444        10000e4 ticker.exe
  51560     292 16725568        16777420        10000cc minimum.exe
 581040    3920 16192452        16777412        10000c4 cxx_iostream.exe
 930736    6112 15840580        16777428        10000d4 fileio.exe
 312448    2564 16462400        16777412        10000c4 capture.exe
 204424    1852 16571136        16777412        10000c4 nsecs.exe
 278248    2160 16497028        16777436        10000dc paranoia.exe
 296488    2088 16478852        16777428        10000d4 cdtest.exe
 178024    1752 16597636        16777412        10000c4 base_sp.exe
 182952    1784 16592708        16777444        10000e4 unlimited.exe
 181688    1728 16594052        16777468        10000fc hello.exe
---
 c/src/lib/libbsp/epiphany/epiphany_sim/make/custom/epiphany_sim.cfg | 3 +++
 1 file changed, 3 insertions(+)

diff --git 
a/c/src/lib/libbsp/epiphany/epiphany_sim/make/custom/epiphany_sim.cfg 
b/c/src/lib/libbsp/epiphany/epiphany_sim/make/custom/epiphany_sim.cfg
index 9eea2a0..1fef608 100644
--- a/c/src/lib/libbsp/epiphany/epiphany_sim/make/custom/epiphany_sim.cfg
+++ b/c/src/lib/libbsp/epiphany/epiphany_sim/make/custom/epiphany_sim.cfg
@@ -5,3 +5,6 @@ RTEMS_CPU = epiphany
 CPU_CFLAGS =
 
 CFLAGS_OPTIMIZE_V ?= -O0 -g
+CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
+
+LDFLAGS = -Wl,--gc-sections
-- 
1.8.3.1

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