[rtems commit] m68k/mcf5235: Add per-section compilation and linking support.

[Joel Sherrill]

Module:    rtems
Branch:    master
Commit:    535e5da90ca348f92557c687a571c4ef87acaaf6
Changeset: http://git.rtems.org/rtems/commit/?id=535e5da90ca348f92557c687a571c4ef87acaaf6

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

m68k/mcf5235: Add per-section compilation and linking support.

The size of the sample executables without this option were:

   text    data     bss     dec     hex filename
  92512    1680    9472  103664   194f0 base_sp.exe
 106960    1648    9072  117680   1cbb0 hello.exe
  31408    1216    3888   36512    8ea0 minimum.exe
 570464    5584   20960  597008   91c10 fileio.exe
 111312    1760    9584  122656   1df20 nsecs.exe
 192048    2048   10064  204160   31d80 paranoia.exe
  96256    1680    9504  107440   1a3b0 ticker.exe
  94800    1696   12912  109408   1ab60 unlimited.exe
 865200   21936   16576  903712   dca20 cxx_iostream.exe
 200480    2256    9648  212384   33da0 cdtest.exe
 194000    2176   11296  207472   32a70 capture.exe

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

   text	   data	    bss	    dec	    hex	filename
  83392	   1632	   9408	  94432	  170e0	base_sp.exe
  96880	   1584	   9008	 107472	  1a3d0	hello.exe
  22912	   1184	   3840	  27936	   6d20	minimum.exe
 552144	   5552	  20624	 578320	  8d310	fileio.exe
 103328	   1728	   9520	 114576	  1bf90	nsecs.exe
 182592	   2016	  10000	 194608	  2f830	paranoia.exe
  87920	   1648	   9440	  99008	  182c0	ticker.exe
  84944	   1664	  12848	  99456	  18480	unlimited.exe
 175248	   2192	   9296	 186736	  2d970	cxx_iostream.exe
 183120	   2128	   9568	 194816	  2f900	cdtest.exe
 182896	   2112	  11232	 196240	  2fe90	capture.exe

---

 c/src/lib/libbsp/m68k/mcf5235/make/custom/mcf5235.cfg | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/c/src/lib/libbsp/m68k/mcf5235/make/custom/mcf5235.cfg b/c/src/lib/libbsp/m68k/mcf5235/make/custom/mcf5235.cfg
index b5c3c49..f3a0861 100644
--- a/c/src/lib/libbsp/m68k/mcf5235/make/custom/mcf5235.cfg
+++ b/c/src/lib/libbsp/m68k/mcf5235/make/custom/mcf5235.cfg
@@ -13,6 +13,9 @@ CPU_CFLAGS = -mcpu=5235
 
 # 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