toolchain/45396: make clean fails in src/lib/libarch for mips build

[Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>]

>Number:         45396
>Category:       toolchain
>Synopsis:       make clean fails in src/lib/libarch for mips build
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Sep 23 15:05:00 +0000 2011
>Originator:     Izumi Tsutsui
>Release:        NetBSD 5.99.55
>Organization:
>Environment:
System: NetBSD 5.99.55 around 20110920
Architecture: host: i386, target: mipsel 
Machine: host: i386, target: pmax
>Description:
pmax (and all mips ports) doesn't build a library src/lib/libarch
and "make clean" fails in src/lib/libarch on pmax, even during
build.sh -m pmax -U build:

---
% pwd
/work/src/lib/libarch
% ../../obj.pmax/tooldir.NetBSD-5.99.55-i386/bin/nbmake-pmax clean
#   clean CLEANFILES
(cd /work/src/lib/libarch && rm -f  ) 
Failed to remove files from /work/src/lib/libarch:
.

*** Failed target:  __doclean
*** Failed command: bad="$(cd /work/src/lib/libarch && ls -d 2>/dev/null)"; if 
test -n "$bad"; then echo "Failed to remove files from /work/src/lib/libarch:" 
; echo "$bad" ; false ; fi 
*** Error code 1

Stop.
nbmake: stopped in /work/src/lib/libarch
% 
---

while "build.sh -m pmax -U -j 1 build" ignores the error (empty arg):
---
% ../../obj.pmax/tooldir.NetBSD-5.99.55-i386/bin/nbmake-pmax -j1 clean
#   clean CLEANFILES
(cd /work/src/lib/libarch && rm -f  ) 
Failed to remove files from /work/src/lib/libarch:
.
*** [__doclean] Error code 1 (ignored)
% 
---
so daily build on releng server works.

>How-To-Repeat:
See above.

>Fix:
Unknown.
Some race in bsd.clean.mk?

---