[src/trunk]: src/share/mk Use "-O2 -fno-reorder-blocks" instead of "-Os" for ...

[tsutsui <tsutsui%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/2446f382cf1e
branches:  trunk
changeset: 330208:2446f382cf1e
user:      tsutsui <tsutsui%NetBSD.org@localhost>
date:      Sun Jun 29 05:20:15 2014 +0000

description:
Use "-O2 -fno-reorder-blocks" instead of "-Os" for m68k default optimization.

"-Os" was specfied when gcc 4.5.x was imported and the commit log says
"-O2 produces much bigger code with gcc 4.5 than it did with gcc 4.1"
but "-Os" disables most inline declarations and makes some applications
much slower.  "-O2 -fno-reorder-blocks" seems enough to reduce sizes
and disabling -freorder-blocks wouldn't cause particular performance
impact on ancient m68k machines with small cache memories.
See my post on port-m68k@ for more details:
http://mail-index.NetBSD.org/port-m68k/2014/06/22/msg000488.html

No objection in the thread and "seems fine to me" from mrg@.

diffstat:

 share/mk/sys.mk |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (20 lines):

diff -r 5100b6383c7b -r 2446f382cf1e share/mk/sys.mk
--- a/share/mk/sys.mk   Sun Jun 29 05:06:46 2014 +0000
+++ b/share/mk/sys.mk   Sun Jun 29 05:20:15 2014 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: sys.mk,v 1.124 2014/04/18 00:37:46 christos Exp $
+#      $NetBSD: sys.mk,v 1.125 2014/06/29 05:20:15 tsutsui Exp $
 #      @(#)sys.mk      8.2 (Berkeley) 3/21/94
 #
 # This file contains the basic rules for make(1) and is read first
@@ -28,8 +28,8 @@
 # -O2 is too -falign-* zealous for low-memory sh3 machines
 DBG?=  -Os -freorder-blocks
 .elif ${MACHINE_ARCH} == "m68k" || ${MACHINE_ARCH} == "m68000"
-# see src/doc/HACKS for details
-DBG?=  -Os
+# -freorder-blocks (enabled by -O2) produces much bigger code
+DBG?=  -O2 -fno-reorder-blocks
 .elif ${MACHINE_ARCH} == "coldfire"
 DBG?=  -O1
 .elif ${MACHINE_ARCH} == "vax"