ENH: Allow selecting Qt bindings using build selectors

.ci_support/linux_64_.yaml → .ci_support/linux_64_build_variantpyqt.yaml

@@ -1,3 +1,5 @@
+build_variant:
+- pyqt
 cdt_name:
 - cos6
 channel_sources:

.ci_support/linux_64_build_variantpyside6.yaml

@@ -0,0 +1,12 @@
+build_variant:
+- pyside6
+cdt_name:
+- cos6
+channel_sources:
+- conda-forge
+channel_targets:
+- conda-forge main
+docker_image:
+- quay.io/condaforge/linux-anvil-cos7-x86_64
+target_platform:
+- linux-64

.ci_support/osx_64_.yaml → .ci_support/osx_64_build_variantpyqt.yaml

@@ -2,6 +2,8 @@ MACOSX_DEPLOYMENT_TARGET:
 - '10.13'
 MACOSX_SDK_VERSION:
 - '10.13'
+build_variant:
+- pyqt
 channel_sources:
 - conda-forge
 channel_targets:

.ci_support/osx_64_build_variantpyside6.yaml

@@ -0,0 +1,14 @@
+MACOSX_DEPLOYMENT_TARGET:
+- '10.13'
+MACOSX_SDK_VERSION:
+- '10.13'
+build_variant:
+- pyside6
+channel_sources:
+- conda-forge
+channel_targets:
+- conda-forge main
+macos_machine:
+- x86_64-apple-darwin13.4.0
+target_platform:
+- osx-64

recipe/conda_build_config.yaml

@@ -0,0 +1,3 @@
+build_variant:
+  - "pyqt"
+  - "pyside6"

recipe/meta.yaml

@@ -2,7 +2,14 @@
 {% set version = "1.7.1" %}
 {% set sha256 = "a87bbc998b792532d2c87add8b0f7bbf28a4d8cf5db1bdfb6d6e260791754498" %}
 {% set pymin = "3.9" %}
-{% set build = 0 %}
+{% set build = 1 %}
+
+# Adapted from https://github.com/conda-forge/vtk-feedstock/blob/main/recipe/meta.yaml
+# PySide6 is lower priority than PyQt5 for backward compat (e.g., with matplotlib,
+# mayavi, etc.) until the ecosystem updates
+{% set build = build + 100 %}  # [build_variant == "pyside6"]
+{% set build = build + 200 %}  # [build_variant == "pyqt"]
+{% set build_string = '{}_py{}h{}_{}'.format(build_variant, CONDA_PY, PKG_HASH, build) %}
 
 package:
   name: {{ name|lower }}
@@ -15,6 +22,7 @@ source:
 
 build:
   number: {{ build }}
+  string: {{ build_string }}
 
 outputs:
   - name: mne-base
@@ -83,7 +91,8 @@ outputs:
         - pyvistaqt >=0.4
         - statsmodels
         - numexpr
-        - pyqt
+        - pyqt  # [build_variant == "pyqt"]
+        - pyside6  # [build_variant == "pyside6"]
         - pillow
         - joblib
         - psutil