[rtems commit] powerpc/ss555: Add per-section compilation and linking support.

[Joel Sherrill]

Module:    rtems
Branch:    master
Commit:    c663474e6b3a2f1380fd986a5ceb3ae824f4c02d
Changeset: http://git.rtems.org/rtems/commit/?id=c663474e6b3a2f1380fd986a5ceb3ae824f4c02d

Author:    Ralph Holmes <ralph at ybden.com>
Date:      Sat Jan 23 18:31:10 2016 +0000

powerpc/ss555: Add per-section compilation and linking support.

The size of the sample executables without this option were:

   text	   data	    bss	    dec	    hex	filename
 124540	   1884	   9068	 135492	  21144	base_sp.exe
 133264	   1832	   9072	 144168	  23328	hello.exe
  82948	   1620	   5816	  90384	  16110	minimum.exe
 637608	   5824	  21344	 664776	  a24c8	fileio.exe
 148908	   1980	   9188	 160076	  2714c	nsecs.exe
 191988	   2260	   9712	 203960	  31cb8	paranoia.exe
 127820	   1892	   9116	 138828	  21e4c	ticker.exe
 127484	   1884	  12908	 142276	  22bc4	unlimited.exe
1056184	  22308	  16356	1094848	 10b4c0	cxx_iostream.exe
 244272	   2852	   9336	 256460	  3e9cc	cdtest.exe
 236156	   2380	  10896	 249432	  3ce58	capture.exe

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

   text	   data	    bss	    dec	    hex	filename
  98616	   1808	   8984	 109408	  1ab60	base_sp.exe
 104960	   1732	   8576	 115268	  1c244	hello.exe
  40124	   1284	   5048	  46456	   b578	minimum.exe
 602352	   5752	  20988	 629092	  99964	fileio.exe
 124632	   1912	   9120	 135664	  211f0	nsecs.exe
 165276	   2192	   9644	 177112	  2b3d8	paranoia.exe
 103548	   1824	   9012	 114384	  1bed0	ticker.exe
 100676	   1808	  12452	 114936	  1c0f8	unlimited.exe
 201480	   2380	   9056	 212916	  33fb4	cxx_iostream.exe
 210304	   2284	   9232	 221820	  3627c	cdtest.exe
 209316	   2288	  10832	 222436	  364e4	capture.exe

---

 c/src/lib/libbsp/powerpc/ss555/make/custom/ss555.cfg | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/c/src/lib/libbsp/powerpc/ss555/make/custom/ss555.cfg b/c/src/lib/libbsp/powerpc/ss555/make/custom/ss555.cfg
index cde7f4a..fab4817 100644
--- a/c/src/lib/libbsp/powerpc/ss555/make/custom/ss555.cfg
+++ b/c/src/lib/libbsp/powerpc/ss555/make/custom/ss555.cfg
@@ -20,6 +20,9 @@ CPU_CFLAGS = -mcpu=$(GCC_CPU_MODEL) -D$(RTEMS_CPU_MODEL)
 
 # optimize flag: typically -O2
 CFLAGS_OPTIMIZE_V = -O2 -g -fno-keep-inline-functions
+CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
+
+LDFLAGS = -Wl,--gc-sections
 
 define bsp-post-link
 	$(default-bsp-post-link)