[rtems commit] m68k/gen68302: Add per-section compilation and linking support.

[Joel Sherrill]

Module:    rtems
Branch:    master
Commit:    4544ffcd471a6b51fae304ff51cd650bc4792d94
Changeset: http://git.rtems.org/rtems/commit/?id=4544ffcd471a6b51fae304ff51cd650bc4792d94

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

m68k/gen68302: Add per-section compilation and linking support.

The size of the sample executables without this option were:

   text    data     bss     dec     hex filename
  78560    1632 12597120    12677312     c170c0 base_sp.exe
  93760    1616 12596720    12692096     c1aa80 hello.exe
  31024    1216 12593472    12625712     c0a730 minimum.exe
 537104    5552 12608608    13151264     c8ac20 fileio.exe
  97888    1728 12597232    12696848     c1bd10 nsecs.exe
 179888    2016 12597728    12779632     c30070 paranoia.exe
  82864    1648 12597152    12681664     c181c0 ticker.exe
  81328    1664 12600560    12683552     c18920 unlimited.exe
 841296   21520 12604224    13467040     cd7da0 cxx_iostream.exe
 187168    2224 12597296    12786688     c31c00 cdtest.exe
 181664    2144 12598944    12782752     c30ca0 capture.exe

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

   text	   data	    bss	    dec	    hex	filename
  71280	   1616	12597056	12669952	 c15400	base_sp.exe
  85552	   1568	12596656	12683776	 c18a00	hello.exe
  22272	   1168	12593408	12616848	 c08490	minimum.exe
 521808	   5520	12608272	13135600	 c86ef0	fileio.exe
  91696	   1696	12597168	12690560	 c1a480	nsecs.exe
 172256	   1984	12597664	12771904	 c2e240	paranoia.exe
  76336	   1616	12597088	12675040	 c167e0	ticker.exe
  73296	   1632	12600496	12675424	 c16960	unlimited.exe
 163568	   2160	12596960	12762688	 c2be40	cxx_iostream.exe
 171744	   2096	12597216	12771056	 c2def0	cdtest.exe
 172384	   2080	12598880	12773344	 c2e7e0	capture.exe

---

 c/src/lib/libbsp/m68k/gen68302/make/custom/gen68302.cfg | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/c/src/lib/libbsp/m68k/gen68302/make/custom/gen68302.cfg b/c/src/lib/libbsp/m68k/gen68302/make/custom/gen68302.cfg
index 60bfed7..e60a641 100644
--- a/c/src/lib/libbsp/m68k/gen68302/make/custom/gen68302.cfg
+++ b/c/src/lib/libbsp/m68k/gen68302/make/custom/gen68302.cfg
@@ -14,3 +14,6 @@ CPU_CFLAGS = -mcpu=68302
 
 # optimize flag: typically -O2
 CFLAGS_OPTIMIZE_V = -O2 -g -fomit-frame-pointer
+CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
+
+LDFLAGS = -Wl,--gc-sections