[src/trunk]: src On VAX, compile gdtoa/misc.c at -O0 to avoid incorrect machi...

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

details:   https://anonhg.NetBSD.org/src/rev/3cba6c30dd87
branches:  trunk
changeset: 372523:3cba6c30dd87
user:      jakllsch <jakllsch%NetBSD.org@localhost>
date:      Sun Dec 04 22:35:15 2022 +0000

description:
On VAX, compile gdtoa/misc.c at -O0 to avoid incorrect machine code
resulting in some doubles printing as garbage.

diffstat:

 doc/HACKS                   |  10 +++++++++-
 lib/libc/gdtoa/Makefile.inc |   9 ++++++++-
 2 files changed, 17 insertions(+), 2 deletions(-)

diffs (44 lines):

diff -r f6668cb609c4 -r 3cba6c30dd87 doc/HACKS
--- a/doc/HACKS Sun Dec 04 19:01:19 2022 +0000
+++ b/doc/HACKS Sun Dec 04 22:35:15 2022 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: HACKS,v 1.231 2022/09/12 08:11:51 rin Exp $
+# $NetBSD: HACKS,v 1.232 2022/12/04 22:35:15 jakllsch Exp $
 #
 # This file is intended to document workarounds for currently unsolved
 # (mostly) compiler bugs.
@@ -592,6 +592,14 @@
                unitialized with -O1, works with -O0
        kcah
 
+       hack    gdtoa/misc.c miscompile
+       cdate   Sun Dec  4 22:27:26 UTC 2022
+       who     jakllsch
+       file    src/lib/libc/gdtoa/Makefile.inc : 1.11
+       descr
+               some doubles print as garbage if gdtoa/misc.c isn't compiled at -O0
+       kcah
+
 port   arm
 
        hack    gcc-unsigned-compare
diff -r f6668cb609c4 -r 3cba6c30dd87 lib/libc/gdtoa/Makefile.inc
--- a/lib/libc/gdtoa/Makefile.inc       Sun Dec 04 19:01:19 2022 +0000
+++ b/lib/libc/gdtoa/Makefile.inc       Sun Dec 04 22:35:15 2022 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: Makefile.inc,v 1.11 2019/08/01 02:06:31 riastradh Exp $
+#      $NetBSD: Makefile.inc,v 1.12 2022/12/04 22:35:15 jakllsch Exp $
 
 # gdtoa sources
 .PATH: ${.CURDIR}/gdtoa
@@ -44,3 +44,10 @@
 .if ${MACHINE_ARCH} != "vax"
 SRCS+= strtord.c
 .endif
+
+# XXX revisit with newer GCC.
+# Ensure numbers like 0xffff319f5fa95963 print correctly
+# ("999999999999999.98", not garbage like "?A>C>@>C:BA;A><.:<")
+.if ${MACHINE_ARCH} == "vax" && defined(HAVE_GCC)
+COPTS.misc.c+= -O0
+.endif