[rtems commit] bfin/bf537Stamp: Add per-section compilation and linking support

[Joel Sherrill]

Module:    rtems
Branch:    master
Commit:    32a4aea5bd88b759cc3ec4ce23ebd7e479b1f702
Changeset: http://git.rtems.org/rtems/commit/?id=32a4aea5bd88b759cc3ec4ce23ebd7e479b1f702

Author:    Joel Sherrill <joel at rtems.org>
Date:      Thu Mar 10 14:25:36 2016 -0600

bfin/bf537Stamp: Add per-section compilation and linking support

updates #2577.

For the bf537Stamp BSP variant without this option sample
executables sizes were as follows:

   text	   data	    bss	    	  dec	    	  hex	filename
  75672	   1884	   9224	  86780	  152fc	ticker.exe
  49668	   1644	   5964	  57276	   dfbc	minimum.exe
 474936	   5964	  22456	 503356	  7ae3c	fileio.exe
 369944	  12480	  38436	 420860	  66bfc	pppd.exe
 162856	   2540	  12136	 177532	  2b57c	capture.exe
  90696	   1972	   9280	 101948	  18e3c	nsecs.exe
 153352	   2256	   9828	 165436	  2863c	paranoia.exe
  74680	   1884	   9192	  85756	  14efc	base_sp.exe
  77048	   1912	  13068	  92028	  1677c	unlimited.exe
  88504	   1856	   9220	  99580	  184fc	hello.exe
 223228	   6372	  16540	 246140	  3c17c	loopback.exe

For the bf537Stamp BSP variant with this option sample executables
sizes were as follows:

   text	   data	    bss	    	  dec	    	  hex	filename
  68524	   1846	   9224	  79594	  136ea	ticker.exe
  28348	   1521	   5700	  35569	   8af1	minimum.exe
 458232	   5926	  22182	 486340	  76bc4	fileio.exe
 331164	   9148	  37592	 377904	  5c430	pppd.exe
 151144	   2470	  12095	 165709	  2874d	capture.exe
  83296	   1934	   9308	  94538	  1714a	nsecs.exe
 143484	   2214	   9808	 155506	  25f72	paranoia.exe
  65332	   1842	   9156	  76330	  12a2a	base_sp.exe
  67080	   1862	  13032	  81974	  14036	unlimited.exe
  78144	   1794	   9196	  89134	  15c2e	hello.exe
 195520	   3090	  16372	 214982	  347c6	loopback.exe

---

 c/src/lib/libbsp/bfin/bf537Stamp/make/custom/bf537Stamp.cfg | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/c/src/lib/libbsp/bfin/bf537Stamp/make/custom/bf537Stamp.cfg b/c/src/lib/libbsp/bfin/bf537Stamp/make/custom/bf537Stamp.cfg
index daa6a55..d533ca4 100644
--- a/c/src/lib/libbsp/bfin/bf537Stamp/make/custom/bf537Stamp.cfg
+++ b/c/src/lib/libbsp/bfin/bf537Stamp/make/custom/bf537Stamp.cfg
@@ -14,3 +14,6 @@ CPU_CFLAGS =
 # optimize flag: typically -O2
 # gcc-4.2.0 segfaults on -OX > -O0
 CFLAGS_OPTIMIZE_V = -O2 -g
+CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
+
+LDFLAGS = -Wl,--gc-sections