[src/trunk]: src/doc move the ufs_lookup hack to the global section and updat...

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

details:   https://anonhg.NetBSD.org/src/rev/e7b0c603e2bb
branches:  trunk
changeset: 345155:e7b0c603e2bb
user:      mrg <mrg%NetBSD.org@localhost>
date:      Tue May 10 19:32:47 2016 +0000

description:
move the ufs_lookup hack to the global section and update it to current
reality.  add a section for the crt hacks.

diffstat:

 doc/HACKS |  34 +++++++++++++++++++++++++---------
 1 files changed, 25 insertions(+), 9 deletions(-)

diffs (62 lines):

diff -r 9c90904d938a -r e7b0c603e2bb doc/HACKS
--- a/doc/HACKS Tue May 10 19:23:59 2016 +0000
+++ b/doc/HACKS Tue May 10 19:32:47 2016 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: HACKS,v 1.166 2016/05/04 22:42:40 christos Exp $
+# $NetBSD: HACKS,v 1.167 2016/05/10 19:32:47 mrg Exp $
 #
 # This file is intended to document workarounds for currently unsolved
 # (mostly) compiler bugs.
@@ -27,6 +27,20 @@
 #
 # this is a comment.
 
+hack   gcc-5.3 miscompiles crt* leading to ctor/dtor related crashes
+mdate  10 May 2016
+who    mrg martin
+file   lib/csu/common/Makefile.inc : 1.26, 1.27, 1.31
+descr
+       GCC assumes non-constant data is constant and assumes that it
+       can generate direct calls out of the ctor/dtor space, which
+       generally breaks their usage.  On SPARC, an explicit call to
+       0 is generated as "clr %g1; call %g1", for example.
+
+       Compiling with -O1 fixes this problem.
+pr     51121
+kcah
+
 hack   gcc-5.3 optimizes memset+malloc -> calloc inside calloc
 mdate  4 May 2016
 who    christos
@@ -36,6 +50,16 @@
        -fno-builtin-malloc
 kcah
 
+hack   turn off tree-vrp for parts of ufs_lookup.c
+mdate  28 April 2016
+who    mrg christos
+file   src/sys/ufs/ufs/ufs_lookup.c : 1.144
+pr     51094
+descr
+       with -ftree-vrp enabled in ufs_lookup.c sometimes bad dir
+       panicks are see.
+hcah
+
 hack   netstat ieee1394 address printing.
 mdate  14 Nov 2000
 who    matt
@@ -792,14 +816,6 @@
                out which option is causing this.
        hcah
 
-       hack    turn off -ftree-vrp for ufs_lookup.c
-       who     mrg
-       file    src/sys/arch/amd64/conf/Makefile.amd64 : 1.54
-       descr
-               with -ftree-vrp enabled in ufs_lookup.c sometimes bad dir
-               panicks are see.  see PR 51094.
-       hcah
-
 port   powerpc
 
        hack    avoid using __builtin_return_address(0) because it fails in