Building Emacs (git head, pdumper, macos)

Building Emacs (git head, pdumper, macos)

[Daniel Pittman]

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G'day.  I've run into a problem using multi-job make while building Emacs
on macos with the pdumper.  Seems like the dependency tree isn't complete
enough, so some lisp compilation jobs happen in parallel to dumping.

This breaks because the running emacs executable no longer matches the
pdump file.

My question here is:
* is using (GNU) make to build with more than one job supported?
* is there a known issue related to this?

(I have searched, and not found anything known, but perhaps I missed it.)

I'm happy to debug further and try for a patch, but I'd like to know that
I'm not doing it wrong™ by using a parallel build first.

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Re: Building Emacs (git head, pdumper, macos)

[Paul Eggert]

On 1/17/20 9:01 AM, Daniel Pittman wrote:
> * is using (GNU) make to build with more than one job supported?

We do support 'make -j', yes. However, I don't think we support multiple 
instances of 'make' running in different build directories while sharing 
the same source directory just checked out from git. This is because the 
build process in this case will update some source files, and the 
different instances of 'make' can step on each others' toes.

> * is there a known issue related to this?

Not that I know of.

Re: Building Emacs (git head, pdumper, macos)

[Daniel Pittman]

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On Fri, Jan 17, 2020 at 2:00 PM Paul Eggert <eggert@cs.ucla.edu> wrote:

> On 1/17/20 9:01 AM, Daniel Pittman wrote:
> > * is using (GNU) make to build with more than one job supported?
>
> We do support 'make -j', yes. However, I don't think we support multiple
> instances of 'make' running in different build directories while sharing
> the same source directory just checked out from git.
>

Thanks.  If I can identify the root cause, I'll submit a patch, or at least
a detailed problem report.  Appreciate your time.

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Re: Building Emacs (git head, pdumper, macos)

[Robert Pluim]

>>>>> On Tue, 21 Jan 2020 12:18:06 -0500, Daniel Pittman <slippycheeze@google.com> said:

    Daniel> On Fri, Jan 17, 2020 at 2:00 PM Paul Eggert <eggert@cs.ucla.edu> wrote:
    >> On 1/17/20 9:01 AM, Daniel Pittman wrote:
    >> > * is using (GNU) make to build with more than one job supported?
    >> 
    >> We do support 'make -j', yes. However, I don't think we support multiple
    >> instances of 'make' running in different build directories while sharing
    >> the same source directory just checked out from git.
    >> 

    Daniel> Thanks.  If I can identify the root cause, I'll submit a patch, or at least
    Daniel> a detailed problem report.  Appreciate your time.

FWIW, I sometimes see this as well on macOS, and I always build in the
source directory. Running 'make' again solves it.

Robert