[rtems commit] powerpc/mpc8260ads: Add per-section compilation and linking support.

[Joel Sherrill]

Module:    rtems
Branch:    master
Commit:    5adc3b63b0bb9f162a9d4b26646cf4c20e063f55
Changeset: http://git.rtems.org/rtems/commit/?id=5adc3b63b0bb9f162a9d4b26646cf4c20e063f55

Author:    Ralph Holmes <ralph at ybden.com>
Date:      Sat Jan 23 18:21:11 2016 +0000

powerpc/mpc8260ads: Add per-section compilation and linking support.

The size of the sample executables without this option were:

   text	   data	    bss	    dec	    hex	filename
 163364	   2976	 139136	 305476	  4a944	base_sp.exe
 150396	   2936	 139080	 292412	  4763c	hello.exe
 142316	   2852	 135864	 281032	  449c8	minimum.exe
 650196	   6950	 151396	 808542	  c565e	fileio.exe
 188132	   3068	 139244	 330444	  50acc	nsecs.exe
 203636	   3352	 139724	 346712	  54a58	paranoia.exe
 166660	   2984	 139168	 308812	  4b64c	ticker.exe
 166964	   2992	 142896	 312852	  4c614	unlimited.exe
1085764	  23416	 146796	1255976	 132a28	cxx_iostream.exe
 271560	   3944	 139788	 415292	  6563c	cdtest.exe
 245700	   3480	 140964	 390144	  5f400	capture.exe

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

   text	   data	    bss	    dec	    hex	filename
 134612	   2936	 139032	 276580	  43864	base_sp.exe
 119380	   2864	 138968	 261212	  3fc5c	hello.exe
  42052	   2416	 135218	 179686	  2bde6	minimum.exe
 610788	   6908	 151016	 768712	  bbac8	fileio.exe
 160180	   3032	 139140	 302352	  49d10	nsecs.exe
 174132	   3312	 139640	 317084	  4d69c	paranoia.exe
 138708	   2948	 139064	 280720	  44890	ticker.exe
 137444	   2936	 142784	 283164	  4521c	unlimited.exe
 233580	   2952	 139432	 375964	  5bc9c	cxx_iostream.exe
 233796	   3040	 139252	 376088	  5bd18	cdtest.exe
 215012	   3412	 140860	 359284	  57b74	capture.exe

---

 c/src/lib/libbsp/powerpc/mpc8260ads/make/custom/mpc8260ads.cfg | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/c/src/lib/libbsp/powerpc/mpc8260ads/make/custom/mpc8260ads.cfg b/c/src/lib/libbsp/powerpc/mpc8260ads/make/custom/mpc8260ads.cfg
index dbee576..71454b2 100644
--- a/c/src/lib/libbsp/powerpc/mpc8260ads/make/custom/mpc8260ads.cfg
+++ b/c/src/lib/libbsp/powerpc/mpc8260ads/make/custom/mpc8260ads.cfg
@@ -17,3 +17,6 @@ CPU_CFLAGS = -mcpu=603e -mstrict-align -Dmpc8260 \
 
 # optimize flag: typically -O2
 CFLAGS_OPTIMIZE_V = -O2 -g -fno-keep-inline-functions
+CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
+
+LDFLAGS = -Wl,--gc-sections