[rtems commit] powerpc/qemuppc: Add per-section compilation and linking support (GCI 2018)

[Joel Sherrill]

Module:    rtems
Branch:    master
Commit:    8b3ca0cb4d05aca68b8d7ebc51443ef7c6344058
Changeset: http://git.rtems.org/rtems/commit/?id=8b3ca0cb4d05aca68b8d7ebc51443ef7c6344058

Author:    Shashvat Jain <shashvatjain2002 at gmail.com>
Date:      Fri Nov 30 11:39:29 2018 -0500

powerpc/qemuppc:Add per-section compilation and linking support (GCI 2018)

The size of the sample executables without this option were:

   text	   data	    bss	    dec	    hex	filename
 101320	   1604	4184764	4287688	 416cc8	./base_sp.exe
 247452	   2656	4183748	4433856	 43a7c0	./capture.exe
 283516	  29564	4183788	4496868	 449de4	./cdtest.exe
 948220	 162032	4183744	5293996	 50c7ac	./cxx_iostream.exe
 642568	   5234	4181152	4828954	 49af1a	./fileio.exe
 133733	   1960	4184372	4320065	 41eb41	./hello.exe
 314124	   6796	4179844	4500764	 44ad1c	./loopback.exe
  60592	    680	4185536	4246808	 40cd18	./minimum.exe
 130936	   2112	4184228	4317276	 41e05c	./nsecs.exe
 180161	   2376	4183956	4366493	 42a09d	./paranoia.exe
 538248	  13040	4173628	4724916	 4818b4	./pppd.exe
 104753	   1636	4184736	4291125	 417a35	./ticker.exe
 104608	   1596	4184788	4290992	 4179b0	./unlimited.exe

The size of the sample executables with this option were:

   text	   data	    bss	    dec	    hex	filename
 611756	  58492	4183964	4854212	 4a11c4	./cxx_iostream.exe
 630360	   5210	4181168	4816738	 497f62	./fileio.exe
 123653	   1956	4184396	4310005	 41c3f5	./hello.exe
 295200	   6776	4179868	4481844	 446334	./loopback.exe
  60608	    668	4185560	4246836	 40cd34	./minimum.exe
 123704	   2108	4184220	4310032	 41c410	./nsecs.exe
 170589	   2364	4183980	4356933	 427b45	./paranoia.exe
 523060	  13016	4173648	4709724	 47dd5c	./pppd.exe
  99533	   1632	4184732	4285897	 4165c9	./ticker.exe
 103608	   1584	4184784	4289976	 4175b8	./unlimited.exe
 231572	   2644	4183736	4417952	 4369a0	./capture.exe
  96544	   1600	4184760	4282904	 415a18	./base_sp.exe
 223456	  10112	4184260	4417828	 436924	./cdtest.exe

Closes #2564

---

 bsps/powerpc/qemuppc/config/qemuppc.cfg | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/bsps/powerpc/qemuppc/config/qemuppc.cfg b/bsps/powerpc/qemuppc/config/qemuppc.cfg
index 5e919c1..1fd28c8 100644
--- a/bsps/powerpc/qemuppc/config/qemuppc.cfg
+++ b/bsps/powerpc/qemuppc/config/qemuppc.cfg
@@ -13,10 +13,9 @@ CPU_CFLAGS = -mcpu=603e
 # optimize flag: typically -O2
 CFLAGS_OPTIMIZE_V = -O2 -g -fno-keep-inline-functions
 
-# FIXME: Disabled because linkcmds lacks proper KEEP() directives. See #2564.
 # The following two lines enable compiling and linking on per element.
-# CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
-# LDFLAGS = -Wl,--gc-sections
+CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
+LDFLAGS = -Wl,--gc-sections
 
 define bsp-post-link
 	$(default-bsp-post-link)