[rtems commit] m68k/av5282: Add per-section compilation and linking support.

[Joel Sherrill]

Module:    rtems
Branch:    master
Commit:    27f460eae7c19d6ab678446d6bb565f806797d15
Changeset: http://git.rtems.org/rtems/commit/?id=27f460eae7c19d6ab678446d6bb565f806797d15

Author:    Ralph Holmes <ralph at ybden.com>
Date:      Sat Jan 23 02:07:34 2016 +0000

m68k/av5282: Add per-section compilation and linking support.

The size of the sample executables without this option were:

   text    data     bss     dec     hex filename
  92432    1680    9472  103584   194a0 base_sp.exe
 106832    1648    9072  117552   1cb30 hello.exe
  31728    1216    3888   36832    8fe0 minimum.exe
 570368    5584   20960  596912   91bb0 fileio.exe
 111232    1760    9584  122576   1ded0 nsecs.exe
 191968    2048   10064  204080   31d30 paranoia.exe
  96176    1680    9504  107360   1a360 ticker.exe
  94672    1696   12912  109280   1aae0 unlimited.exe
 865072   21936   16576  903584   dc9a0 cxx_iostream.exe
 200400    2256    9648  212304   33d50 cdtest.exe
 194128    2176   11296  207600   32af0 capture.exe

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

   text	   data	    bss	    dec	    hex	filename
  83360	   1632	   9408	  94400	  170c0	base_sp.exe
  96816	   1584	   9008	 107408	  1a390	hello.exe
  22976	   1184	   3840	  28000	   6d60	minimum.exe
 552320	   5552	  20624	 578496	  8d3c0	fileio.exe
 103296	   1728	   9520	 114544	  1bf70	nsecs.exe
 182560	   2016	  10000	 194576	  2f810	paranoia.exe
  87888	   1648	   9440	  98976	  182a0	ticker.exe
  84880	   1664	  12848	  99392	  18440	unlimited.exe
 175168	   2192	   9296	 186656	  2d920	cxx_iostream.exe
 183088	   2128	   9568	 194784	  2f8e0	cdtest.exe
 183056	   2112	  11232	 196400	  2ff30	capture.exe

---

 c/src/lib/libbsp/m68k/av5282/make/custom/av5282.cfg | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/c/src/lib/libbsp/m68k/av5282/make/custom/av5282.cfg b/c/src/lib/libbsp/m68k/av5282/make/custom/av5282.cfg
index a668d99..1266401 100644
--- a/c/src/lib/libbsp/m68k/av5282/make/custom/av5282.cfg
+++ b/c/src/lib/libbsp/m68k/av5282/make/custom/av5282.cfg
@@ -14,6 +14,9 @@ CPU_CFLAGS = -mcpu=528x
 
 # optimize flag: typically -O2
 CFLAGS_OPTIMIZE_V = -O2 -g -fomit-frame-pointer
+CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
+
+LDFLAGS = -Wl,--gc-sections
 
 ifndef MTARGET
 MTARGET=ram