updates #2577.

For the gensh4 BSP variant without this option sample executables
sizes were as follows:

   text    data     bss           dec             hex   filename
  75538   10666    7264   93468   16d1c ticker.exe
  21810    6166    3008   30984    7908 minimum.exe
 424370   69762   20476  514608   7da30 fileio.exe
 342538   50782   36468  429788   68edc pppd.exe
 150930   23130   10168  184228   2cfa4 capture.exe
  90578   11078    7348  109004   1a9cc nsecs.exe
 125010   22190    7824  155024   25d90 paranoia.exe
 153282   26686    8328  188296   2df88 cdtest.exe
  73426   10498    7232   91156   16414 base_sp.exe
  75186   10734   11072   96992   17ae0 unlimited.exe
  85650    9070    7224  101944   18e38 hello.exe
 212390   22942   14556  249888   3d020 loopback.exe

For the gensh4 BSP variant with this option sample executables sizes
were as follows:

   text    data     bss           dec             hex   filename
  70418   10214    7228   87860   15734 ticker.exe
  14514    4886    2984   22384    5770 minimum.exe
 411234   67894   20184  499312   79e70 fileio.exe
 309906   43666   35668  389240   5f078 pppd.exe
 143074   22414   10132  175620   2ae04 capture.exe
  86130   10606    7312  104048   19670 nsecs.exe
 118978   21714    7804  148496   24410 paranoia.exe
 147778   15814    8292  171884   29f6c cdtest.exe
  67890   10042    7196   85128   14c88 base_sp.exe
  69010   10254   11036   90300   160bc unlimited.exe
  78850    8578    7204   94632   171a8 hello.exe
 189586   17346   14392  221324   3608c loopback.exe
---
 c/src/lib/libbsp/sh/gensh4/make/custom/gensh4.cfg | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/c/src/lib/libbsp/sh/gensh4/make/custom/gensh4.cfg 
b/c/src/lib/libbsp/sh/gensh4/make/custom/gensh4.cfg
index dd1a9f7..4eb20f9 100644
--- a/c/src/lib/libbsp/sh/gensh4/make/custom/gensh4.cfg
+++ b/c/src/lib/libbsp/sh/gensh4/make/custom/gensh4.cfg
@@ -23,4 +23,7 @@ RTEMS_CPU_MODEL=sh7750
 CPU_CFLAGS = -m4 -ml
 
 # optimize flag: typically -O2
-CFLAGS_OPTIMIZE_V = -O2 -g 
+CFLAGS_OPTIMIZE_V = -O2 -g
+CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
+
+LDFLAGS = -Wl,--gc-sections
-- 
1.8.3.1

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