updates #2577.

NOTE: In contrast to other BSPs, this was built with SMP enabled to
      ensure the _smp variant was built properly.

For the realview_pbx_a9_qemu BSP variant without this option,
sample executable sizes were as follows:

   text    data     bss           dec             hex   filename
 129776    1692 267238996       267370464       fefbfe0 ticker.exe
  92729    1452 267276272       267370453       fefbfd5 minimum.exe
 624404    1980 266744076       267370460       fefbfdc cxx_iostream.exe
 597787    5936 266766716       267370439       fefbfc7 fileio.exe
 470724   14336 266885392       267370452       fefbfd4 pppd.exe
 219648    2448 267148360       267370456       fefbfd8 capture.exe
 140398    1780 267228276       267370454       fefbfd6 nsecs.exe
 200972    2100 267167384       267370456       fefbfd8 paranoia.exe
 193188    1716 267175568       267370472       fefbfe8 cdtest.exe
 125512    1692 267243260       267370464       fefbfe0 base_sp.exe
 129392    1724 267239348       267370464       fefbfe0 unlimited.exe
 126564    1668 267242240       267370472       fefbfe8 hello.exe
 289336    6708 267074400       267370444       fefbfcc loopback.exe

For the realview_pbx_a9_qemu BSP variant with this option,
sample executable sizes were as follows:

   text    data     bss           dec             hex   filename
 122812    1684 267245960       267370456       fefbfd8 ticker.exe
  61366    1368 267307732       267370466       fefbfe2 minimum.exe
 409100    1948 266959408       267370456       fefbfd8 cxx_iostream.exe
 579093    5928 266785444       267370465       fefbfe1 fileio.exe
 435584   14084 266920804       267370472       fefbfe8 pppd.exe
 207412    2432 267160600       267370444       fefbfcc capture.exe
 134006    1772 267234668       267370446       fefbfce nsecs.exe
 193744    2092 267174608       267370444       fefbfcc paranoia.exe
 184796    1716 267183960       267370472       fefbfe8 cdtest.exe
 118288    1684 267250484       267370456       fefbfd8 base_sp.exe
 118636    1700 267250136       267370472       fefbfe8 unlimited.exe
 115488    1628 267253344       267370460       fefbfdc hello.exe
 268276    6508 267095664       267370448       fefbfd0 loopback.exe

For the realview_pbx_a9_qemu_smp BSP variant without this option,
sample executable sizes were as follows:

   text    data     bss           dec             hex   filename
 129776    1692 267238996       267370464       fefbfe0 ticker.exe
  92729    1452 267276272       267370453       fefbfd5 minimum.exe
 624404    1980 266744076       267370460       fefbfdc cxx_iostream.exe
 597791    5936 266766712       267370439       fefbfc7 fileio.exe
 470724   14336 266885392       267370452       fefbfd4 pppd.exe
 219648    2448 267148360       267370456       fefbfd8 capture.exe
 140398    1780 267228276       267370454       fefbfd6 nsecs.exe
 200972    2100 267167384       267370456       fefbfd8 paranoia.exe
 193188    1716 267175568       267370472       fefbfe8 cdtest.exe
 125512    1692 267243260       267370464       fefbfe0 base_sp.exe
 129392    1724 267239348       267370464       fefbfe0 unlimited.exe
 126564    1668 267242240       267370472       fefbfe8 hello.exe
 289336    6708 267074400       267370444       fefbfcc loopback.exe

For the realview_pbx_a9_qemu_smp BSP variant with this option,
sample executable sizes were as follows:

   text    data     bss           dec             hex   filename
 122812    1684 267245960       267370456       fefbfd8 ticker.exe
  61366    1368 267307732       267370466       fefbfe2 minimum.exe
 409100    1948 266959408       267370456       fefbfd8 cxx_iostream.exe
 579097    5928 266785440       267370465       fefbfe1 fileio.exe
 435584   14084 266920804       267370472       fefbfe8 pppd.exe
 207412    2432 267160600       267370444       fefbfcc capture.exe
 134006    1772 267234668       267370446       fefbfce nsecs.exe
 193744    2092 267174608       267370444       fefbfcc paranoia.exe
 184796    1716 267183960       267370472       fefbfe8 cdtest.exe
 118288    1684 267250484       267370456       fefbfd8 base_sp.exe
 118636    1700 267250136       267370472       fefbfe8 unlimited.exe
 115488    1628 267253344       267370460       fefbfdc hello.exe
 268276    6508 267095664       267370448       fefbfd0 loopback.exe
---
 .../libbsp/arm/realview-pbx-a9/make/custom/realview_pbx_a9_qemu.cfg    | 3 +++
 1 file changed, 3 insertions(+)

diff --git 
a/c/src/lib/libbsp/arm/realview-pbx-a9/make/custom/realview_pbx_a9_qemu.cfg 
b/c/src/lib/libbsp/arm/realview-pbx-a9/make/custom/realview_pbx_a9_qemu.cfg
index 5b63eed..19531d3 100644
--- a/c/src/lib/libbsp/arm/realview-pbx-a9/make/custom/realview_pbx_a9_qemu.cfg
+++ b/c/src/lib/libbsp/arm/realview-pbx-a9/make/custom/realview_pbx_a9_qemu.cfg
@@ -3,5 +3,8 @@ include $(RTEMS_ROOT)/make/custom/default.cfg
 RTEMS_CPU = arm
 
 CPU_CFLAGS = -march=armv7-a -mthumb -mfpu=neon -mfloat-abi=hard 
-mtune=cortex-a9
+CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
+
+LDFLAGS = -Wl,--gc-sections
 
 CFLAGS_OPTIMIZE_V ?= -O0 -g
-- 
1.8.3.1

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