[src/trunk]: src/doc PR port-sh3/56311

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

details:   https://anonhg.NetBSD.org/src/rev/4b93eaafe0cc
branches:  trunk
changeset: 1022383:4b93eaafe0cc
user:      rin <rin%NetBSD.org@localhost>
date:      Thu Jul 15 08:02:47 2021 +0000

description:
PR port-sh3/56311

Document -O0 workaround for initdecl() in doc/HACKS.

diffstat:

 doc/HACKS |  12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)

diffs (23 lines):

diff -r 29ec0ec63b11 -r 4b93eaafe0cc doc/HACKS
--- a/doc/HACKS Thu Jul 15 07:58:05 2021 +0000
+++ b/doc/HACKS Thu Jul 15 08:02:47 2021 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: HACKS,v 1.222 2021/07/06 12:42:12 thorpej Exp $
+# $NetBSD: HACKS,v 1.223 2021/07/15 08:02:47 rin Exp $
 #
 # This file is intended to document workarounds for currently unsolved
 # (mostly) compiler bugs.
@@ -997,3 +997,13 @@
 
                https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101177
 kcah
+
+port   sh3
+hack   compile lint1/initdecl() with -O0 for sh3 (port-sh3/56311)
+cdate  Thu Jul 15 07:58:05 UTC 2021
+who    rin
+file   src/usr.bin/xlint/lint1/decl.c: 1.200
+descr  GCC 9 and 10 miscompile initdecl() due to improper use of scratch
+       register, as described in the PR. Compiling this function with -O0
+       works around the problem.
+kcah