[rtems commit] powerpc/mpc8260ads: Add per-section compilation and linking support (GCI 2018)

[Joel Sherrill]

Module:    rtems
Branch:    master
Commit:    c056f219f8111e05d22822b79d9b70ced38f3f89
Changeset: http://git.rtems.org/rtems/commit/?id=c056f219f8111e05d22822b79d9b70ced38f3f89

Author:    Shashvat Jain <shashvatjain2002 at gmail.com>
Date:      Fri Nov 30 13:07:17 2018 -0500

powerpc/mpc8260ads:Add per-section compilation and linking support (GCI 2018)

The size of the sample executables without this option were:

   text	   data	    bss	    dec	    hex	filename
 257876	   3416	 148812	 410104	  641f8	./capture.exe
 126956	   2428	 145836	 275220	  43314	./base_sp.exe
 330400	   4600	 146916	 481916	  75a7c	./cdtest.exe
1092476	  23588	 153684	1269748	 135ff4	./cxx_iostream.exe
 654892	   6056	 158868	 819816	  c8268	./fileio.exe
 159260	   2812	 145956	 308028	  4b33c	./hello.exe
 339392	   7344	 152824	 499560	  79f68	./loopback.exe
 106388	   2276	 142644	 251308	  3d5ac	./minimum.exe
 156348	   2960	 145980	 305288	  4a888	./nsecs.exe
 201020	   3204	 146592	 350816	  55a60	./paranoia.exe
 547684	  13548	 175556	 736788	  b3e14	./pppd.exe
 130108	   2468	 145872	 278448	  43fb0	./ticker.exe
 129740	   2436	 149696	 281872	  44d10	./unlimited.exe

The size of the sample executables with this option were:

   text	   data	    bss	    dec	    hex	filename
 246508	   2856	 147036	 396400	  60c70	./cxx_iostream.exe
 641752	   6016	 158548	 806316	  c4dac	./fileio.exe
 148264	   2800	 145916	 296980	  48814	./hello.exe
 319252	   7340	 152756	 479348	  75074	./loopback.exe
 100396	   2288	 142556	 245240	  3bdf8	./minimum.exe
 148200	   2932	 145892	 297024	  48840	./nsecs.exe
 190520	   3192	 146552	 340264	  53128	./paranoia.exe
 531300	  13544	 175480	 720324	  afdc4	./pppd.exe
 124008	   2472	 145788	 272268	  4278c	./ticker.exe
 127848	   2432	 149660	 279940	  44584	./unlimited.exe
 121272	   2432	 145752	 269456	  41c90	./base_sp.exe
 241104	   3412	 148768	 393284	  60044	./capture.exe
 245424	   2936	 146876	 395236	  607e4	./cdtest.exe

Closes #2565

---

 bsps/powerpc/mpc8260ads/config/mpc8260ads.cfg | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/bsps/powerpc/mpc8260ads/config/mpc8260ads.cfg b/bsps/powerpc/mpc8260ads/config/mpc8260ads.cfg
index d335e92..7b5a9dc 100644
--- a/bsps/powerpc/mpc8260ads/config/mpc8260ads.cfg
+++ b/bsps/powerpc/mpc8260ads/config/mpc8260ads.cfg
@@ -16,7 +16,6 @@ CPU_CFLAGS = -mcpu=603e -mstrict-align -meabi -msdata=sysv -fno-common
 # optimize flag: typically -O2
 CFLAGS_OPTIMIZE_V = -O2 -g -fno-keep-inline-functions
 
-# FIXME: Disabled because linkcmds lacks proper KEEP() directives. See #2565.
 # The following two lines enable compiling and linking on per element.
-# CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
-# LDFLAGS = -Wl,--gc-sections
+CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
+LDFLAGS = -Wl,--gc-sections