[rtems commit] m68k/mvme147: Add per-section compilation and linking support.

[Joel Sherrill]

Module:    rtems
Branch:    master
Commit:    01835fd6fef455232e480721fa686dfc1cf570f3
Changeset: http://git.rtems.org/rtems/commit/?id=01835fd6fef455232e480721fa686dfc1cf570f3

Author:    Ralph Holmes <ralph at ybden.com>
Date:      Sat Jan 23 02:07:35 2016 +0000

m68k/mvme147: Add per-section compilation and linking support.

The size of the sample executables without this option were:

   text    data     bss     dec     hex filename
  79696    1600   32144  113440   1bb20 base_sp.exe
  89008    1584   31728  122320   1ddd0 hello.exe
  36512    1184   28480   66176   10280 minimum.exe
 523824    5520   43632  572976   8be30 fileio.exe
  98832    1696   32256  132784   206b0 nsecs.exe
 146736    1984   32736  181456   2c4d0 paranoia.exe
  84016    1616   32176  117808   1cc30 ticker.exe
  82384    1632   35584  119600   1d330 unlimited.exe
 828000   21408   39216  888624   d8f30 cxx_iostream.exe
 178832    2032   32288  213152   340a0 cdtest.exe
 173088    2112   33968  209168   33110 capture.exe

The size of the sample executables with this option enabled were:

   text	   data	    bss	    dec	    hex	filename
  72864	   1584	  32080	 106528	  1a020	base_sp.exe
  81200	   1536	  31664	 114400	  1bee0	hello.exe
  29792	   1152	  28432	  59376	   e7f0	minimum.exe
 508480	   5504	  43296	 557280	  880e0	fileio.exe
  93024	   1680	  32192	 126896	  1efb0	nsecs.exe
 139520	   1952	  32672	 174144	  2a840	paranoia.exe
  77920	   1600	  32112	 111632	  1b410	ticker.exe
  74896	   1600	  35504	 112000	  1b580	unlimited.exe
 156224	   2048	  31936	 190208	  2e700	cxx_iostream.exe
 164032	   1984	  32192	 198208	  30640	cdtest.exe
 164144	   2064	  33904	 200112	  30db0	capture.exe

---

 c/src/lib/libbsp/m68k/mvme147/make/custom/mvme147.cfg | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/c/src/lib/libbsp/m68k/mvme147/make/custom/mvme147.cfg b/c/src/lib/libbsp/m68k/mvme147/make/custom/mvme147.cfg
index 9880587..8e925cb 100644
--- a/c/src/lib/libbsp/m68k/mvme147/make/custom/mvme147.cfg
+++ b/c/src/lib/libbsp/m68k/mvme147/make/custom/mvme147.cfg
@@ -13,6 +13,9 @@ CPU_CFLAGS = -mcpu=68030
 
 # optimize flag: typically -O2
 CFLAGS_OPTIMIZE_V = -O2 -g -fomit-frame-pointer
+CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
+
+LDFLAGS = -Wl,--gc-sections
 
 define bsp-post-link
 	$(OBJCOPY) -O srec $(basename $@)$(EXEEXT) $(basename $@).srec