Re: filtering job options from MAKEFLAGS, manually

[Laszlo Ersek]

On 01/24/19 02:54, David Boyce wrote:
> Yes, -j1 is the right and obvious solution but I think you have
> .NOTPARALLEL completely backwards. Here's what the manual says:
> 
> If .NOTPARALLEL is mentioned as a target, then this invocation of make will
> be run serially, even if the ‘-j’ option is given ... Any prerequisites on
> this target are ignored.

My bad, you are right!
Thanks!
Laszlo

> On Wed, Jan 23, 2019 at 5:10 PM Laszlo Ersek <address@hidden> wrote:
> 
>> 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
>>
>