Re: Parallel make output in $(shell ${MAKE} ...)

[David Boyce]

Add -j1 to the set of options?

> On Mar 6, 2021, at 1:36 PM, Glenn Morris <rgm@gnu.org> wrote:
> 
> 
> Hi,
> 
> I added a construct like the following to the Emacs Makefiles recently:
> 
>  texi_misc = $(shell ${MAKE} --no-print-directory -s -C doc/misc echo-sources)
> 
>  info/dir: ${texi_misc}
>     ...do something...
> 
> Obviously that's simplified; the full thing can be seen at:
>  https://git.savannah.gnu.org/cgit/emacs.git/tree/Makefile.in#n1011
> 
> The doc/misc/Makefile "echo-sources" target echoes a list of source
> files to stdout.
> 
> It seems that texi_misc can end up containing parallel make output, eg
> https://lists.gnu.org/r/emacs-devel/2021-03/msg00305.html
> 
> I found it surprising that $(shell ) could get polluted in this way.
> 
> Is there a way to avoid this problem, that is portable to GNU make >= 3.81?
> 
> Thanks.
>