pkg/48385: gmake 4.0 loops on tmpfs

[dholland%NetBSD.org@localhost]

>Number:         48385
>Category:       pkg
>Synopsis:       gmake 4.0 loops on tmpfs
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Nov 17 16:55:00 +0000 2013
>Originator:     David A. Holland
>Release:        NetBSD 6.99.19 (20130404)
>Organization:
>Environment:
System: NetBSD valkyrie 6.99.19 NetBSD 6.99.19 (VALKYRIE) #13: Sun Nov  3 
17:07:36 EST 2013  dholland@valkyrie:/usr/src/sys/arch/amd64/compile/VALKYRIE 
amd64
Architecture: x86_64
Machine: amd64
>Description:

With the enclosed makefile, running on tmpfs, gmake 4.0 loops forever
rerunning the recipe for objdir/depend.mk. It does not happen with
gmake 3.82.

I originally ran into this in audio/flite's bulk build.

There is some chance it reflects a problem in tmpfs, but that doesn't
seem very likely.

>How-To-Repeat:

Place the following on a tmpfs volume and run "gmake"; it will loop
forever.

   ------ begin Makefile ------
all:
        echo all

objdir:
        mkdir -p objdir || true

objdir/depend.mk: objdir
        rm -f objdir/depend.mk
        echo 'foo: bar' > objdir/depend.mk

include objdir/depend.mk
   ------ end Makefile ------

>Fix: