[src/trunk]: src/sys/conf enable gcc stack usage limit for kernel functions, ...

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

details:   https://anonhg.NetBSD.org/src/rev/23bf28879839
branches:  trunk
changeset: 973265:23bf28879839
user:      jdolecek <jdolecek%NetBSD.org@localhost>
date:      Thu Jun 25 14:52:26 2020 +0000

description:
enable gcc stack usage limit for kernel functions, set to 3.5 KiB for now
as that seems to be enough to accomodate the current biggest stack usages

there are about six functions which use over 3KiB local stack, and
about a dozen between 2-3 KiB, so pushing this further needs more work
if desired

compile tested on amd64, i386, sparc64, sparc, powerpc (evbppc - BookE),
m68k (mac68k)

diffstat:

 sys/conf/Makefile.kern.inc |  4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diffs (18 lines):

diff -r ca5d5234025e -r 23bf28879839 sys/conf/Makefile.kern.inc
--- a/sys/conf/Makefile.kern.inc        Thu Jun 25 14:52:00 2020 +0000
+++ b/sys/conf/Makefile.kern.inc        Thu Jun 25 14:52:26 2020 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: Makefile.kern.inc,v 1.273 2020/06/19 00:58:17 simonb Exp $
+#      $NetBSD: Makefile.kern.inc,v 1.274 2020/06/25 14:52:26 jdolecek Exp $
 #
 # This file contains common `MI' targets and definitions and it is included
 # at the bottom of each `MD' ${MACHINE}/conf/Makefile.${MACHINE}.
@@ -108,7 +108,7 @@
 #    find . -name \*.su | xargs awk '{ printf "%6d %s\n", $2, $1 }' | sort -n
 .if ${MACHINE} != "vax"
 # GCC/vax 8.4 does not support -fstack-usage.
-CFLAGS+=       ${${ACTIVE_CC} == "gcc":? -fstack-usage :}
+CFLAGS+=       ${${ACTIVE_CC} == "gcc":? -fstack-usage -Wstack-usage=3584 :}
 .endif
 
 # XXX