[rtems commit] powerpc/virtex5: Add per-section compilation and linking support.

[Joel Sherrill]

Module:    rtems
Branch:    master
Commit:    82bf2773a67323acb54b2426e525060dc29c5caa
Changeset: http://git.rtems.org/rtems/commit/?id=82bf2773a67323acb54b2426e525060dc29c5caa

Author:    Ralph Holmes <ralph at ybden.com>
Date:      Sat Jan 23 18:40:43 2016 +0000

powerpc/virtex5: Add per-section compilation and linking support.

The size of the sample executables without this option were:

   text	   data	    bss	    dec	    hex	filename
 117297	   9206	   6797	 133300	  208b4	base_sp.exe
 133249	   8030	   6757	 148036	  24244	hello.exe
  51473	   5066	   3217	  59756	   e96c	minimum.exe
 568081	  80530	  19053	 667664	  a3010	fileio.exe
 140193	  10950	   6901	 158044	  2695c	nsecs.exe
 206113	  21330	   7465	 234908	  3959c	paranoia.exe
 120465	   9374	   6829	 136668	  215dc	ticker.exe
 119665	   9390	  10573	 139628	  2216c	unlimited.exe
 883345	 198988	  14433	1096766	 10bc3e	cxx_iostream.exe
 225057	  26914	   7469	 259440	  3f570	cdtest.exe
 221937	  23050	   8625	 253612	  3deac	capture.exe

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

   text	   data	    bss	    dec	    hex	filename
 105569	   7804	   6777	 120150	  1d556	base_sp.exe
 119025	   6596	   6729	 132350	  204fe	hello.exe
  40177	   3720	   3197	  47094	   b7f6	minimum.exe
 546465	  77136	  18773	 642374	  9cd46	fileio.exe
 129217	   9526	   6881	 145624	  238d8	nsecs.exe
 193617	  19908	   7441	 220966	  35f26	paranoia.exe
 108993	   7972	   6809	 123774	  1e37e	ticker.exe
 106129	   7884	  10545	 124558	  1e68e	unlimited.exe
 554997	  38836	  13621	 607454	  944de	cxx_iostream.exe
 215193	  17384	   7449	 240026	  3a99a	cdtest.exe
 207809	  21400	   8605	 237814	  3a0f6	capture.exe

---

 c/src/lib/libbsp/powerpc/virtex5/make/custom/virtex5.cfg | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/c/src/lib/libbsp/powerpc/virtex5/make/custom/virtex5.cfg b/c/src/lib/libbsp/powerpc/virtex5/make/custom/virtex5.cfg
index 9601fbc..f2cb727 100644
--- a/c/src/lib/libbsp/powerpc/virtex5/make/custom/virtex5.cfg
+++ b/c/src/lib/libbsp/powerpc/virtex5/make/custom/virtex5.cfg
@@ -10,6 +10,9 @@ CPU_CFLAGS = -mcpu=440 -Dppc440 -msoft-float
 
 # optimize flag: typically -O2
 CFLAGS_OPTIMIZE_V = -O2 -g -fno-keep-inline-functions
+CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
+
+LDFLAGS = -Wl,--gc-sections
 
 # Miscellaneous additions go here
 define bsp-post-link