[rtems commit] arm/edb7312: Add per-section compilation and linking support

[Joel Sherrill]

Module:    rtems
Branch:    master
Commit:    d0aab2b3a952969da1fc141b5f20ccd2b59b49cd
Changeset: http://git.rtems.org/rtems/commit/?id=d0aab2b3a952969da1fc141b5f20ccd2b59b49cd

Author:    Aun-Ali Zaidi <admin at kodeit.net>
Date:      Sat Jan  9 12:16:13 2016 -0600

arm/edb7312: Add per-section compilation and linking support

The size of the sample executables without this option were:

   text	   data	  bss		dec		hex	filename
  60732	   1636	16714848	16777216	1000000	minimum.exe
  93700	   1868	16681632	16777200	 fffff0	base_sp.exe
 114076	   1956	16661156	16777188	 ffffe4	nsecs.exe
 192608	   2352	16582244	16777204	 fffff4	capture.exe
 205980	   1896	16569312	16777188	 ffffe4	cdtest.exe
 182060	   2252	16592900	16777212	 fffffc	paranoia.exe
 106596	   1844	16668772	16777212	 fffffc	hello.exe
 564540	   5780	16206884	16777204	 fffff4	fileio.exe
  97136	   1868	16678212	16777216	1000000	ticker.exe
 273136	   6656	16497408	16777200	 fffff0	loopback.exe
 592916	   2112	16182176	16777204	 fffff4	cxx_iostream.exe
 451920	  12764	16312512	16777196	 ffffec	pppd.exe
  95812	   1900	16679488	16777200	 fffff0	unlimited.exe

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

   text	   data	  bss		dec		 hex	filename
  32020	   1208	16743968	16777196	 ffffec	minimum.exe
  87720	   1708	16687780	16777208	 fffff8	base_sp.exe
 108192	   1796	16667200	16777188	 ffffe4	nsecs.exe
 184488	   2184	16590532	16777204	 fffff4	capture.exe
 197940	   1744	16577504	16777188	 ffffe4	cdtest.exe
 175420	   2084	16599684	16777188	 ffffe4	paranoia.exe
  98044	   1684	16677476	16777204	 fffff4	hello.exe
 548124	   5620	16223460	16777204	 fffff4	fileio.exe
  91140	   1708	16684352	16777200	 fffff0	ticker.exe
 252968	   6408	16517824	16777200	 fffff0	loopback.exe
 414640	   1952	16360612	16777204	 fffff4	cxx_iostream.exe
 418608	  12472	16346116	16777196	 ffffec	pppd.exe
  87616	   1740	16687844	16777200	 fffff0	unlimited.exe

---

 c/src/lib/libbsp/arm/edb7312/make/custom/edb7312.cfg | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/c/src/lib/libbsp/arm/edb7312/make/custom/edb7312.cfg b/c/src/lib/libbsp/arm/edb7312/make/custom/edb7312.cfg
index bc596aa..832f47b 100644
--- a/c/src/lib/libbsp/arm/edb7312/make/custom/edb7312.cfg
+++ b/c/src/lib/libbsp/arm/edb7312/make/custom/edb7312.cfg
@@ -14,3 +14,7 @@ CPU_CFLAGS = -mcpu=$(RTEMS_CPU_MODEL)
 
 # optimize flag: typically -O2
 CFLAGS_OPTIMIZE_V = -O2 -g
+
+# Add CFLAGS and LDFLAGS for compiling and linking with per item sections
+CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
+LDFLAGS            = -Wl,--gc-sections