updates #2577.

For the m32csim BSP variant without this option sample executables
sizes were as follows:

   text    data     bss           dec             hex   filename
 143148    1118    4664  148930   245c2 ticker.exe
  55140     584     876   56600    dd18 minimum.exe
 268638    1804    6598  277040   43a30 capture.exe
 161226    1184    4712  167122   28cd2 nsecs.exe
 389500    1518    5176  396194   60ba2 paranoia.exe
 135256    1118    4638  141012   226d4 base_sp.exe
 139728    1146    6482  147356   23f9c unlimited.exe
 165500    1092    4638  171230   29cde hello.exe

For the m32csim BSP variant with this option sample executables
sizes were as follows:

   text    data     bss           dec             hex   filename
 137586    1096    4526  143208   22f68 ticker.exe
  31136     454     738   32328    7e48 minimum.exe
 252540    1764    6458  260762   3fa9a capture.exe
 155716    1162    4570  161448   276a8 nsecs.exe
 378606    1492    5038  385136   5e070 paranoia.exe
 124526    1092    4500  130118   1fc46 base_sp.exe
 128746    1120    6344  136210   21412 unlimited.exe
 154278    1066    4500  159844   27064 hello.exe
---
 c/src/lib/libbsp/m32c/m32cbsp/make/custom/m32csim.cfg | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/c/src/lib/libbsp/m32c/m32cbsp/make/custom/m32csim.cfg 
b/c/src/lib/libbsp/m32c/m32cbsp/make/custom/m32csim.cfg
index cee695d..491f000 100644
--- a/c/src/lib/libbsp/m32c/m32cbsp/make/custom/m32csim.cfg
+++ b/c/src/lib/libbsp/m32c/m32cbsp/make/custom/m32csim.cfg
@@ -15,3 +15,6 @@ CPU_CFLAGS = -mcpu=m32cm
 # see GCC PR37665
 #CFLAGS_OPTIMIZE_V = -Os -g
 CFLAGS_OPTIMIZE_V = -O0 -g
+CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
+
+LDFLAGS = -Wl,--gc-sections
-- 
1.8.3.1

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