[rtems commit] mips/jmr3904: Add per-section compilation and linking support

[Joel Sherril]

Module:    rtems
Branch:    master
Commit:    bd655345c1a5f7dba42ddf6cd56f6259c62eb267
Changeset: http://git.rtems.org/rtems/commit/?id=bd655345c1a5f7dba42ddf6cd56f6259c62eb267

Author:    Joel Sherrill <joel at rtems.org>
Date:      Tue Jan  5 17:21:59 2016 -0600

mips/jmr3904: Add per-section compilation and linking support

The size of the sample executables without this option were:

 128028	   1812	  12224	 142064	  22af0	ticker.exe
  52600	   1324	   8192	  62116	   f2a4	minimum.exe
1156240	   2168	  19696	1178104	 11f9f8	cxx_iostream.exe
 706952	   5908	  24600	 737460	  b40b4	fileio.exe
 243232	   2372	  14084	 259688	  3f668	capture.exe
 155660	   1940	  12376	 169976	  297f8	nsecs.exe
 201256	   2212	  12896	 216364	  34d2c	paranoia.exe
 253696	   1872	  12576	 268144	  41770	cdtest.exe
 124452	   1812	  12208	 138472	  21ce8	base_sp.exe
 127640	   1844	  15648	 145132	  236ec	unlimited.exe
 133452	   1780	  11760	 146992	  23e30	hello.exe

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

 115052	   1712	  12096	 128860	  1f75c	ticker.exe
  40760	   1256	   8144	  50160	   c3f0	minimum.exe
 671768	   2076	  18688	 692532	  a9134	cxx_iostream.exe
 679672	   5696	  23992	 709360	  ad2f0	fileio.exe
 227384	   2196	  13924	 243504	  3b730	capture.exe
 143132	   1832	  12248	 157212	  2661c	nsecs.exe
 187736	   2104	  12768	 202608	  31770	paranoia.exe
 234324	   1788	  12448	 248560	  3caf0	cdtest.exe
 111556	   1712	  12080	 125348	  1e9a4	base_sp.exe
 112876	   1744	  15520	 130140	  1fc5c	unlimited.exe
 118120	   1688	  11696	 131504	  201b0	hello.exe

---

 c/src/lib/libbsp/mips/jmr3904/make/custom/jmr3904.cfg | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/c/src/lib/libbsp/mips/jmr3904/make/custom/jmr3904.cfg b/c/src/lib/libbsp/mips/jmr3904/make/custom/jmr3904.cfg
index 056f63c..6b76135 100644
--- a/c/src/lib/libbsp/mips/jmr3904/make/custom/jmr3904.cfg
+++ b/c/src/lib/libbsp/mips/jmr3904/make/custom/jmr3904.cfg
@@ -10,3 +10,8 @@ RTEMS_CPU_MODEL=tx3904
 CPU_CFLAGS = -march=r3900 -Wa,-xgot -G0
 
 CFLAGS_OPTIMIZE_V = -O2 -g
+
+# arguments to compile and link with per-element sections
+CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
+LDFLAGS            = -Wl,--gc-sections
+