[rtems commit] powerpc/tqm8xx: Add per-section compilation and linking support.

[Joel Sherrill]

Module:    rtems
Branch:    master
Commit:    0a9ee085a03978658d60e07babd1d6df7ece41c0
Changeset: http://git.rtems.org/rtems/commit/?id=0a9ee085a03978658d60e07babd1d6df7ece41c0

Author:    Ralph Holmes <ralph at ybden.com>
Date:      Sat Jan 23 20:40:27 2016 +0000

powerpc/tqm8xx: Add per-section compilation and linking support.

For the pghplus BSP variant:

The size of the sample executables without this option were:

   text	   data	    bss	    dec	    hex	filename
 167168	   2720	   7776	 177664	  2b600	base_sp.exe
 154336	   2592	   7712	 164640	  28320	hello.exe
 146272	   2528	   4512	 153312	  256e0	minimum.exe
 647904	   6752	  20032	 674688	  a4b80	fileio.exe
 190656	   2816	   7872	 201344	  31280	nsecs.exe
 230816	   3104	   8384	 242304	  3b280	paranoia.exe
 170336	   2752	   7808	 180896	  2c2a0	ticker.exe
 170624	   2752	  11552	 184928	  2d260	unlimited.exe
 956800	 156928	  15424	1129152	 113ac0	cxx_iostream.exe
 268096	  10656	   8448	 287200	  461e0	cdtest.exe
 248896	   3232	   9600	 261728	  3fe60	capture.exe

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

   text	   data	    bss	    dec	    hex	filename
 154080	   2720	   7744	 164544	  282c0	base_sp.exe
 139040	   2528	   7680	 149248	  24700	hello.exe
  46944	   1824	   3968	  52736	   ce00	minimum.exe
 622016	   6688	  19712	 648416	  9e4e0	fileio.exe
 178304	   2816	   7840	 188960	  2e220	nsecs.exe
 217024	   3104	   8352	 228480	  37c80	paranoia.exe
 157536	   2720	   7776	 168032	  29060	ticker.exe
 156000	   2720	  11488	 170208	  298e0	unlimited.exe
 611040	 143808	  14560	 769408	  bbd80	cxx_iostream.exe
 254464	  10144	   8416	 273024	  42a80	cdtest.exe
 232160	   3200	   9568	 244928	  3bcc0	capture.exe

For the tqm8xx_stk8xx variant:

The size of the sample executables without this option were:

   text	   data	    bss	    dec	    hex	filename
 167168	   2720	   7776	 177664	  2b600	base_sp.exe
 154336	   2592	   7712	 164640	  28320	hello.exe
 146272	   2528	   4512	 153312	  256e0	minimum.exe
 647904	   6752	  20032	 674688	  a4b80	fileio.exe
 190656	   2816	   7872	 201344	  31280	nsecs.exe
 230816	   3104	   8384	 242304	  3b280	paranoia.exe
 170336	   2752	   7808	 180896	  2c2a0	ticker.exe
 170624	   2752	  11552	 184928	  2d260	unlimited.exe
 956800	 156928	  15424	1129152	 113ac0	cxx_iostream.exe
 268096	  10656	   8448	 287200	  461e0	cdtest.exe
 248896	   3232	   9600	 261728	  3fe60	capture.exe

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

   text	   data	    bss	    dec	    hex	filename
 154080	   2720	   7744	 164544	  282c0	base_sp.exe
 139040	   2528	   7680	 149248	  24700	hello.exe
  46944	   1824	   3968	  52736	   ce00	minimum.exe
 622016	   6688	  19712	 648416	  9e4e0	fileio.exe
 178304	   2816	   7840	 188960	  2e220	nsecs.exe
 217024	   3104	   8352	 228480	  37c80	paranoia.exe
 157536	   2720	   7776	 168032	  29060	ticker.exe
 156000	   2720	  11488	 170208	  298e0	unlimited.exe
 611040	 143808	  14560	 769408	  bbd80	cxx_iostream.exe
 254464	  10144	   8416	 273024	  42a80	cdtest.exe
 232160	   3200	   9568	 244928	  3bcc0	capture.exe

---

 c/src/lib/libbsp/powerpc/tqm8xx/make/custom/tqm8xx.inc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/c/src/lib/libbsp/powerpc/tqm8xx/make/custom/tqm8xx.inc b/c/src/lib/libbsp/powerpc/tqm8xx/make/custom/tqm8xx.inc
index a932314..5bd08e3 100644
--- a/c/src/lib/libbsp/powerpc/tqm8xx/make/custom/tqm8xx.inc
+++ b/c/src/lib/libbsp/powerpc/tqm8xx/make/custom/tqm8xx.inc
@@ -13,6 +13,9 @@ CPU_CFLAGS = -mcpu=860 -Dmpc860 \
 
 # 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
 	cp $(basename $@)$(EXEEXT) $(basename $@)$(DOWNEXT)