[src/trunk]: src/doc Update gdb/dwarf2expr.c hack for earmv7hf{,eb}; the situ...

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

details:   https://anonhg.NetBSD.org/src/rev/84d4abefb9ab
branches:  trunk
changeset: 940178:84d4abefb9ab
user:      rin <rin%NetBSD.org@localhost>
date:      Mon Oct 05 13:32:31 2020 +0000

description:
Update gdb/dwarf2expr.c hack for earmv7hf{,eb}; the situation does not
change even for GCC 9.3 with ``memcmp'' fix.

diffstat:

 doc/HACKS |  7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diffs (24 lines):

diff -r a8a0ee0da8cd -r 84d4abefb9ab doc/HACKS
--- a/doc/HACKS Mon Oct 05 13:20:30 2020 +0000
+++ b/doc/HACKS Mon Oct 05 13:32:31 2020 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: HACKS,v 1.211 2020/10/05 13:20:30 rin Exp $
+# $NetBSD: HACKS,v 1.212 2020/10/05 13:32:31 rin Exp $
 #
 # This file is intended to document workarounds for currently unsolved
 # (mostly) compiler bugs.
@@ -974,11 +974,12 @@
 kcah
 
 port   earmv7hf*
-hack   compile gdb/dwarf2expr.c with -O0 for GCC8 (toolchain/54820 and 54877)
+hack   compile gdb/dwarf2expr.c with -O0 for GCC[89] (toolchain/54820, 54877)
 cdate  Wed Apr 29 11:04:58 UTC 2020
+mdate  Mon Oct  5 22:30:00 JST 2020
 who    rin
 file   src/external/gpl3/gdb/lib/libgdb/Makefile: 1.22
-descr  GCC 8.4 miscompiles dwarf2expr.c with -O2 or -O1, which results in
+descr  GCC 8.4 and 9.3 miscompile dwarf2expr.c with -O[21], which results in
        crashes with 'gdb_exception_RETURN_MASK_ERROR'. Note that this occurs
        only for earmv7hf{,eb} as far as I can see. Neither earmv6hf{,eb} nor
        earmv7{,eb} (softfloat) are affected.