svn commit: r289778 - head/share/mk

[Bryan Drewery]

> On Oct 22, 2015, at 16:59, Ian Lepore <ian at freebsd.org> wrote:
> 
>> On Thu, 2015-10-22 at 23:41 +0000, Bryan Drewery wrote:
>> Author: bdrewery
>> Date: Thu Oct 22 23:41:56 2015
>> New Revision: 289778
>> URL: https://svnweb.freebsd.org/changeset/base/289778
>> 
>> Log:
>>  For SUBDIR_PARALLEL, when doing 'make clean*' or 'make obj' there
>> is no need to
>>  respect SUBDIR_DEPEND_* or .WAIT.
>> 
>>  MFC after:    2 weeks
>>  Sponsored by:    EMC / Isilon Storage Division
> 
> This doesn't feel so safe.  People override these targets and do who
> -knows-what with them.  The clean* seems especially risky since it will
> match targets in end-user makefiles that you don't even know about.
> 
> -- Ian
> 
> 

I can limit it to src tree builds if you want.

I cannot imagine any situation where "clean<something>" depends on another directory going first. 

Similarly it makes sense to always build subdirs in parallel with 'obj' and I would argue 'clean*' too, regardless of SUBDIR_PARALLEL. I only just realized that. Yes there are mkdir -p and rm -f races, but we have not added any dependencies because of these as is.