subsequent rebuilds of notmuch always re-build sphinx and ruby

[Daniel Kahn Gillmor]

On Mon 2019-04-22 21:03:05 -0300, David Bremner wrote:
> There was a problem with the first patch, which I replaced with two more.

thanks.  i've reviewed and published my review on that series.  I think
it should probably be merged.

> I'm open to ideas, but keep in mind we want to support parallel make,
> which means we have to be careful not to trigger multiple invocations of
> sphinx-build in parallel.

hm, i'm not entirely sure why sphinx-build can't be run in parallel, if
it could target the creation of specific files (but maybe it can't).

I do note that (independent of this series), if i run the following
loop:


     while make -j4 --trace; do
        python3 -c 'print("="*100)'
        touch doc/man1/notmuch-reply.rst
     done

then only every second run of make contains this info:


doc/Makefile.local:38: update target 'doc/_build/man/man1/notmuch-reply.1.gz' due to: doc/_build/man/man1/notmuch-reply.1
rm -f doc/_build/man/man1/notmuch-reply.1.gz && gzip --stdout doc/_build/man/man1/notmuch-reply.1 > doc/_build/man/man1/notmuch-reply.1.gz
doc/Makefile.local:38: update target 'doc/_build/man/man1/notmuch-reindex.1.gz' due to: doc/_build/man/man1/notmuch-reindex.1
rm -f doc/_build/man/man1/notmuch-reindex.1.gz && gzip --stdout doc/_build/man/man1/notmuch-reindex.1 > doc/_build/man/man1/notmuch-reindex.1.gz
doc/Makefile.local:38: update target 'doc/_build/man/man1/notmuch-restore.1.gz' due to: doc/_build/man/man1/notmuch-restore.1
rm -f doc/_build/man/man1/notmuch-restore.1.gz && gzip --stdout doc/_build/man/man1/notmuch-restore.1 > doc/_build/man/man1/notmuch-restore.1.gz
doc/Makefile.local:38: update target 'doc/_build/man/man1/notmuch-new.1.gz' due to: doc/_build/man/man1/notmuch-new.1
rm -f doc/_build/man/man1/notmuch-new.1.gz && gzip --stdout doc/_build/man/man1/notmuch-new.1 > doc/_build/man/man1/notmuch-new.1.gz
doc/Makefile.local:38: update target 'doc/_build/man/man1/notmuch-dump.1.gz' due to: doc/_build/man/man1/notmuch-dump.1
rm -f doc/_build/man/man1/notmuch-dump.1.gz && gzip --stdout doc/_build/man/man1/notmuch-dump.1 > doc/_build/man/man1/notmuch-dump.1.gz
doc/Makefile.local:38: update target 'doc/_build/man/man1/notmuch-address.1.gz' due to: doc/_build/man/man1/notmuch-address.1
rm -f doc/_build/man/man1/notmuch-address.1.gz && gzip --stdout doc/_build/man/man1/notmuch-address.1 > doc/_build/man/man1/notmuch-address.1.gz
doc/Makefile.local:38: update target 'doc/_build/man/man1/notmuch-tag.1.gz' due to: doc/_build/man/man1/notmuch-tag.1
rm -f doc/_build/man/man1/notmuch-tag.1.gz && gzip --stdout doc/_build/man/man1/notmuch-tag.1 > doc/_build/man/man1/notmuch-tag.1.gz
doc/Makefile.local:38: update target 'doc/_build/man/man1/notmuch-count.1.gz' due to: doc/_build/man/man1/notmuch-count.1
rm -f doc/_build/man/man1/notmuch-count.1.gz && gzip --stdout doc/_build/man/man1/notmuch-count.1 > doc/_build/man/man1/notmuch-count.1.gz
doc/Makefile.local:38: update target 'doc/_build/man/man1/notmuch-search.1.gz' due to: doc/_build/man/man1/notmuch-search.1
rm -f doc/_build/man/man1/notmuch-search.1.gz && gzip --stdout doc/_build/man/man1/notmuch-search.1 > doc/_build/man/man1/notmuch-search.1.gz
doc/Makefile.local:38: update target 'doc/_build/man/man1/notmuch-emacs-mua.1.gz' due to: doc/_build/man/man1/notmuch-emacs-mua.1
rm -f doc/_build/man/man1/notmuch-emacs-mua.1.gz && gzip --stdout doc/_build/man/man1/notmuch-emacs-mua.1 > doc/_build/man/man1/notmuch-emacs-mua.1.gz
doc/Makefile.local:38: update target 'doc/_build/man/man1/notmuch-show.1.gz' due to: doc/_build/man/man1/notmuch-show.1
rm -f doc/_build/man/man1/notmuch-show.1.gz && gzip --stdout doc/_build/man/man1/notmuch-show.1 > doc/_build/man/man1/notmuch-show.1.gz
doc/Makefile.local:38: update target 'doc/_build/man/man1/notmuch-insert.1.gz' due to: doc/_build/man/man1/notmuch-insert.1
rm -f doc/_build/man/man1/notmuch-insert.1.gz && gzip --stdout doc/_build/man/man1/notmuch-insert.1 > doc/_build/man/man1/notmuch-insert.1.gz
doc/Makefile.local:38: update target 'doc/_build/man/man1/notmuch.1.gz' due to: doc/_build/man/man1/notmuch.1
rm -f doc/_build/man/man1/notmuch.1.gz && gzip --stdout doc/_build/man/man1/notmuch.1 > doc/_build/man/man1/notmuch.1.gz
doc/Makefile.local:38: update target 'doc/_build/man/man1/notmuch-compact.1.gz' due to: doc/_build/man/man1/notmuch-compact.1
rm -f doc/_build/man/man1/notmuch-compact.1.gz && gzip --stdout doc/_build/man/man1/notmuch-compact.1 > doc/_build/man/man1/notmuch-compact.1.gz
doc/Makefile.local:38: update target 'doc/_build/man/man1/notmuch-config.1.gz' due to: doc/_build/man/man1/notmuch-config.1
rm -f doc/_build/man/man1/notmuch-config.1.gz && gzip --stdout doc/_build/man/man1/notmuch-config.1 > doc/_build/man/man1/notmuch-config.1.gz
doc/Makefile.local:38: update target 'doc/_build/man/man5/notmuch-hooks.5.gz' due to: doc/_build/man/man5/notmuch-hooks.5
rm -f doc/_build/man/man5/notmuch-hooks.5.gz && gzip --stdout doc/_build/man/man5/notmuch-hooks.5 > doc/_build/man/man5/notmuch-hooks.5.gz
doc/Makefile.local:38: update target 'doc/_build/man/man7/notmuch-properties.7.gz' due to: doc/_build/man/man7/notmuch-properties.7
rm -f doc/_build/man/man7/notmuch-properties.7.gz && gzip --stdout doc/_build/man/man7/notmuch-properties.7 > doc/_build/man/man7/notmuch-properties.7.gz
doc/Makefile.local:38: update target 'doc/_build/man/man7/notmuch-search-terms.7.gz' due to: doc/_build/man/man7/notmuch-search-terms.7
rm -f doc/_build/man/man7/notmuch-search-terms.7.gz && gzip --stdout doc/_build/man/man7/notmuch-search-terms.7 > doc/_build/man/man7/notmuch-search-terms.7.gz

and the other times, it doesn't show up.  I'd expect this to be
idempotent, but i'm not sure why it does this.  it doesn't do it when
make is run with -j1.

     --dkg
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