Re: filtering job options from MAKEFLAGS, manually

[Laszlo Ersek]

On 01/23/19 15:45, David Boyce wrote:
> And don't forget that many clever things can be done with --exec, e.g.
> "--exec .NOTPARALLEL:". But -j1 seems simpler in this case.
> 
> On Wed, Jan 23, 2019 at 8:51 AM Paul Smith <address@hidden> wrote:
> 
>> On Wed, 2019-01-23 at 11:24 +0100, Laszlo Ersek wrote:
>>> Would it be safe / robust to filter out "-j" and "--jobserver-fds=3,4"
>>> as well, manually? (E.g. by sticking a shell script between the outer
>>> and inner make processes.)
>>
>> Why not simply add "-j1" explicitly to the inner-make invocation?  That
>> will disable the job server.
>>
>>> In particular, "--jobserver-fds" is not documented in end-user
>>> documentation, apparently, so I get a feeling this option could
>>> change at any time, as an implementation detail of distributing jobs.
>>
>> In fact it DID change, in GNU make 4.2, to be --jobserver-auth.  At the
>> same time this new option was published in the documentation and made
>> an official part of the GNU make interface.

Awesome, thank you both. Appending "-j1" to the command line of the
inner make seems a lot simpler than spelling out the pre-requisites of
.NOTPARALLEL.

(In fact it crossed my mind that .NOTPARALLEL could be extended to a
prerequisite-less form, like .SECONDARY: it would then apply to all
targets. But, "-j1" should work fine.)

Thank you!
Laszlo