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

[Joel Sherrill]

Module:    rtems
Branch:    master
Commit:    4e98ffa0ca651717413fbf3d0b2acd03059dc1d3
Changeset: http://git.rtems.org/rtems/commit/?id=4e98ffa0ca651717413fbf3d0b2acd03059dc1d3

Author:    Ralph Holmes <ralph at ybden.com>
Date:      Sat Jan 23 18:42:55 2016 +0000

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

The size of the sample executables without this option were:

   text	   data	    bss	    dec	    hex	filename
 131684	   1996	  10076	 143756	  2318c	base_sp.exe
 146568	   1964	   9684	 158216	  26a08	hello.exe
  58268	   1456	   6076	  65800	  10108	minimum.exe
 644900	   5932	  22332	 673164	  a458c	fileio.exe
 156052	   2088	  10180	 168320	  29180	nsecs.exe
 229652	   2372	  10744	 242768	  3b450	paranoia.exe
 135908	   2004	  10108	 148020	  24234	ticker.exe
 134132	   2020	  13500	 149652	  24894	unlimited.exe
1094228	   2656	  17360	1114244	 110084	cxx_iostream.exe
 257588	   2564	  10332	 270484	  42094	cdtest.exe
 247588	   2488	  11904	 261980	  3ff5c	capture.exe

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

   text	   data	    bss	    dec	    hex	filename
 115628	   1956	  10024	 127608	  1f278	base_sp.exe
 127884	   1904	   9592	 139380	  22074	hello.exe
  44044	   1396	   6024	  51464	   c908	minimum.exe
 617276	   5896	  22020	 645192	  9d848	fileio.exe
 141580	   2056	  10128	 153764	  258a4	nsecs.exe
 213452	   2332	  10688	 226472	  374a8	paranoia.exe
 120940	   1968	  10056	 132964	  20764	ticker.exe
 115948	   1972	  13440	 131360	  20120	unlimited.exe
 224884	   1984	  10048	 236916	  39d74	cxx_iostream.exe
 233696	   2068	  10280	 246044	  3c11c	cdtest.exe
 229292	   2424	  11852	 243568	  3b770	capture.exe

---

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

diff --git a/c/src/lib/libbsp/powerpc/haleakala/make/custom/haleakala.cfg b/c/src/lib/libbsp/powerpc/haleakala/make/custom/haleakala.cfg
index 67ffe58..e43b739 100644
--- a/c/src/lib/libbsp/powerpc/haleakala/make/custom/haleakala.cfg
+++ b/c/src/lib/libbsp/powerpc/haleakala/make/custom/haleakala.cfg
@@ -17,6 +17,9 @@ CPU_CFLAGS = -mcpu=405 -Dppc405
 # -O4 is ok for RTEMS
 # NOTE: some level of -O may be actually required by inline assembler
 CFLAGS_OPTIMIZE_V = -O1 -g
+CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
+
+LDFLAGS = -Wl,--gc-sections
 
 define bsp-post-link
 	$(default-bsp-post-link)