svn commit: r258848 - user/hrs/releng/release

Glen Barber gjb at
Mon Dec 2 17:20:55 UTC 2013

On Tue, Dec 03, 2013 at 02:14:39AM +0900, Hiroki Sato wrote:
> gj> >  - In the current, variables unintentionally set in the
> gj> >    builder's environment still pollutes commands which run in
> gj> > when the variables are not set in the script but
> gj> >    accepted by make or other utilities.  Catching all of the variables
> gj> >    is quite difficult.
> gj> >
> gj>
> gj> Do you have an example?  If you are referring to a previous problem with
> gj> 10.x builds, the actual problem was a race in the build toolchain, and
> gj> not variable pollution.  I was able to confirm this was the case there.
>  One of the surprising examples I experienced was that svn co
>  sometimes fails with LC_ALL=C.  Subversion stores repo data in UTF-8,
>  so iconv conversion happens when LC_ALL is not UTF-8 compatible (and
>  it broke "svn co head/" a while ago).  Besides, TARGET, TARGET_ARCH,
>  MAKEOBJDIR, MAKEOBJDIRPREFIX, and OBJDIR are also dangerous and
>  unprotected variables for make(1).  An empty TARGET caused an
>  infinite loop in libc build, so I fixed it in Makefile yesterday.

I saw your fix for empty TARGET.  I ran into that problem quite some
time ago.

>  All of them are examples of "unintentional" variables, so being
>  careful is enough to avoid them, though.
> gj> >  Anyway, I do not have a strong opinion if using FOO=A or : ${FOO:=A}.
> gj> >  I agree that the latter assumes all of the envvars must be under
> gj> >  control and it needs one more step than just invoking the script, and
> gj> >  a leaked variable can break the build.  If you do not like it, I will
> gj> >  change them with FOO=A.
> gj> >
> gj>
> gj> Yes, please.
>  Will do.  I will not merge the changes before 10.0R is out in any
>  case.

Right, but I will still likely have to change build scripts (again) for
head/ snapshots...


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