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Propagate changes to backend loading to setup/setupext.#11962

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tacaswell merged 1 commit intomatplotlib:masterfrom
anntzer:setupextbackend
Sep 15, 2018
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Propagate changes to backend loading to setup/setupext.#11962
tacaswell merged 1 commit intomatplotlib:masterfrom
anntzer:setupextbackend

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@anntzer anntzer commented Aug 28, 2018

  1. Restore the ability to set the default backend from setup.cfg (finishes closing Backend related issues with matplotlib 3.0.0rc1 #11844 attn @tacaswell).
  2. Remove the backend fallback code.

Note that not including mpl-data/*.glade in the package data is fine:
that file had been removed in 962388f anyways.

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PR Checklist

  • Has Pytest style unit tests
  • Code is Flake 8 compliant
  • New features are documented, with examples if plot related
  • Documentation is sphinx and numpydoc compliant
  • Added an entry to doc/users/next_whats_new/ if major new feature (follow instructions in README.rst there)
  • Documented in doc/api/api_changes.rst if API changed in a backward-incompatible way

@anntzer anntzer added this to the v3.0 milestone Aug 28, 2018
@anntzer anntzer added the Build label Aug 28, 2018
@anntzer
Propagate changes to backend loading to setup/setupext.
954e84d 
1) Restore the ability to set the default backend from setup.cfg.
2) Remove the backend fallback code.

Note that not including `mpl-data/*.glade` in the package data is fine:
that file had been removed in 962388f anyways.
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tacaswell commented Aug 28, 2018

Thanks @anntzer !

@tacaswell tacaswell added the Release critical For bugs that make the library unusable (segfaults, incorrect plots, etc) and major regressions. label Aug 28, 2018
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mdboom commented Aug 30, 2018

For those building from source (which I'm sure is a decreasing number), this is bound to cause confusion because it will no longer attempt to pick the "best" backend for their system.

For packagers, just telling them to set things with setup.cfg (which has worked for a long time, but wasn't the default) is clearly a step forward.

I think optimizing for the common case, this makes sense. But maybe to make the first faction happy we should say something at the end of compilation like: "Your default backend is set to X. This may not be optimal for your system."?

mdboom
mdboom reviewed Aug 30, 2018
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setup.cfg.template
# The Agg, Ps, Pdf and SVG backends do not require external dependencies. Do
# not choose MacOSX, or TkAgg if you have disabled the relevant extension
# modules. Agg will be used by default.
# modules. The default is determined by fallback.
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@mdboom mdboom Aug 30, 2018

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I don't understand this change. Isn't the fallback approach being removed by this PR? (Or is this referring to something else recent that I probably missed while away from the project for the last couple of years...)

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@tacaswell tacaswell Sep 10, 2018

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The fallback has been moved to runtime (not build time).

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anntzer commented Aug 30, 2018

Indeed, things changed with #9795 / #11581 / #11600 (sorry the discussion is a bit spread out). We still pick the best backend, but do it at import time now. So the best-backend-picking behavior occurs even when you install from a prebuilt distribution (wheel, linux distro, etc.).

@anntzer anntzer mentioned this pull request Aug 31, 2018
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tacaswell commented Sep 10, 2018

This has infact passed on travis, a webhook just got lost.

@jklymak jklymak requested a review from QuLogic September 10, 2018 19:08
@tacaswell tacaswell merged commit dadb8d0 into matplotlib:master Sep 15, 2018
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@anntzer anntzer deleted the setupextbackend branch September 15, 2018 20:18
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tacaswell commented Sep 15, 2018

Went ahead and merged this to move 3.0 forward, will do the backport by hand.

tacaswell added a commit to tacaswell/matplotlib that referenced this pull request Sep 15, 2018
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Merge pull request matplotlib#11962 from anntzer/setupextbackend
9b1c4be 
BLD: Propagate changes to backend loading to setup/setupext.
This was referenced Sep 15, 2018
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@tacaswell tacaswell tacaswell approved these changes

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