First attempt at creating distinct package for platform plugins

recipes/qt-gtk-platformtheme/build.sh

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+set -ex
+
+# This creates a standalone shared library that mimics the results
+# of configuring qt with the flag `-gtk`
+#
+# By creating this standalone package, we simplify the proces of
+# rebuilding qt due to requiring fewer dependencies for the main package
+# requiring fewer bumps when the version changes.
+# The CMakeLists.txt file was inspired by the one from Fedora
+# https://github.com/FedoraQt/QGnomePlatform
+# and is likely to work for qt6
+cp -R src/plugins/platformthemes/gtk3/ qgtk3
+cd qgtk3
+cp ${RECIPE_DIR}/gtk_theme_CMakeLists.txt CMakeLists.txt
+
+mkdir -p build
+cd build
+
+cmake ${CMAKE_ARGS} \
+    -DCMAKE_BUILD_TYPE="Release"    \
+    -DCMAKE_PREFIX_PATH=${PREFIX}   \
+    ..
+
+make -j${CPU_COUNT}
+make install

recipes/qt-gtk-platformtheme/gtk_theme_CMakeLists.txt

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+project(QtGTKPlatformTheme)
+
+cmake_minimum_required(VERSION 3.16)
+
+option(USE_QT6 "Use Qt6 instead of Qt5" OFF)
+
+if (USE_QT6)
+    set(QT_MIN_VERSION "6.2.0")
+    set(CMAKE_CXX_STANDARD 17)
+    set(CMAKE_CXX_STANDARD_REQUIRED ON)
+    set(QT_VERSION_MAJOR "6")
+else()
+    set(QT_MIN_VERSION "5.15.2")
+    set(CMAKE_CXX_STANDARD 14)
+    set(CMAKE_CXX_STANDARD_REQUIRED ON)
+    set(QT_VERSION_MAJOR "5")
+endif()
+
+find_package(Qt${QT_VERSION_MAJOR} ${QT_MIN_VERSION} CONFIG REQUIRED COMPONENTS
+    Core
+    DBus
+    Gui
+    Widgets
+    ThemeSupport
+)
+
+if (NOT QT_PLUGINS_DIR)
+    if (NOT USE_QT6)
+        get_target_property(REAL_QMAKE_EXECUTABLE ${Qt5Core_QMAKE_EXECUTABLE}
+                            IMPORTED_LOCATION)
+        execute_process(COMMAND "${REAL_QMAKE_EXECUTABLE}" -query QT_INSTALL_PLUGINS
+                        OUTPUT_VARIABLE QT_PLUGINS_DIR
+                        ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
+    else()
+        set(QT_PLUGINS_DIR ${QT6_INSTALL_PLUGINS})
+    endif()
+endif()
+
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(GTK+3 REQUIRED IMPORTED_TARGET gtk+-3.0)
+
+
+find_package(X11 REQUIRED)
+
+set(gtk_theme_SRCS
+    main.cpp
+    qgtk3dialoghelpers.cpp
+    qgtk3dialoghelpers.h
+    qgtk3menu.cpp
+    qgtk3menu.h
+    qgtk3theme.cpp
+    qgtk3theme.h
+)
+
+add_library(qgtk3 MODULE ${gtk_theme_SRCS})
+target_compile_definitions(qgtk3 PRIVATE -DGDK_VERSION_MIN_REQUIRED=GDK_VERSION_3_6)
+
+target_link_libraries(qgtk3
+    PkgConfig::GTK+3
+    Qt${QT_VERSION_MAJOR}::Core
+    Qt${QT_VERSION_MAJOR}::CorePrivate
+    Qt${QT_VERSION_MAJOR}::Gui
+    Qt${QT_VERSION_MAJOR}::GuiPrivate
+)
+
+if (NOT USE_QT6)
+    target_link_libraries(qgtk3 Qt5::ThemeSupportPrivate)
+endif()
+set_property(TARGET qgtk3 PROPERTY AUTOMOC ON)
+
+install(TARGETS qgtk3 DESTINATION ${QT_PLUGINS_DIR}/platformthemes)
+

recipes/qt-gtk-platformtheme/meta.yaml

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+{% set version = "5.15.6" %}
+# {% set version = "5.15.8" %}
+
+package:
+  name: qt-gtk-platformtheme
+  version: {{ version }}
+
+source:
+  # We only need to download the smaller qt-base, not qt-main for this plugin
+  url: https://download.qt.io/official_releases/qt/{{ version.rpartition('.')[0] }}/{{ version }}/submodules/qtbase-everywhere-opensource-src-{{ version }}.tar.xz
+  sha256: 396bc6b0d773ac6a7c691a4c3d901999f571e3e7033d7fd6f65e4ef2b6eb7340  # 5.15.6
+    # sha256: bfb11126c7f3abc3fdf86425ce912988b864a7e79a606d77325cffdbacb4be9c  # 5.15.8
+
+build:
+  number: 0
+  skip: true  # [not linux]
+  detect_binary_files_with_prefix: true
+  run_exports:
+    - {{ pin_subpackage('qt-gtk-platformtheme', max_pin='x.x') }}
+
+requirements:
+  build:
+    - cmake
+    - make                               # [unix]
+    - jom                                # [win]
+    - ninja
+    - perl
+    - {{ compiler('cxx') }}
+    - {{ compiler('c') }}
+    # This could just depend on qt-base later
+    # https://github.com/conda-forge/staged-recipes/pull/21505
+    # - qt-base  {{ version }}             # [build_platform != target_platform]
+    - qt-main {{ version }}             # [build_platform != target_platform]
+    - sysroot_linux-64 2.17              # [linux]
+    - {{ cdt('xorg-x11-proto-devel') }}  # [linux]
+    - {{ cdt('libx11-devel') }}          # [linux]
+    - {{ cdt('libxext') }}               # [linux]
+    - {{ cdt('libxext-devel') }}         # [linux]
+    - {{ cdt('libxrender-devel') }}      # [linux]
+    - {{ cdt('mesa-libgl-devel') }}      # [linux]
+    - {{ cdt('mesa-libegl') }}           # [linux]
+    - {{ cdt('mesa-libegl-devel') }}     # [linux]
+    - {{ cdt('mesa-dri-drivers') }}      # [linux]
+    - {{ cdt('libxau-devel') }}          # [linux]
+    - {{ cdt('alsa-lib-devel') }}        # [linux]
+    - {{ cdt('gtk2-devel') }}            # [linux]
+    - {{ cdt('gtkmm24-devel') }}         # [linux]
+    - {{ cdt('libdrm-devel') }}          # [linux]
+    - {{ cdt('libxcomposite-devel') }}   # [linux]
+    - {{ cdt('libxcursor-devel') }}      # [linux]
+    - {{ cdt('libxi-devel') }}           # [linux]
+    - {{ cdt('libxrandr-devel') }}       # [linux]
+    - {{ cdt('pciutils-devel') }}        # [linux]
+    - {{ cdt('libxscrnsaver-devel') }}   # [linux]
+    - {{ cdt('libxtst-devel') }}         # [linux]
+    - {{ cdt('libselinux') }}            # [linux]
+    - {{ cdt('libselinux-devel') }}      # [linux]
+    - {{ cdt('libxdamage') }}            # [linux]
+    - {{ cdt('libxdamage-devel') }}      # [linux]
+    - {{ cdt('libxfixes') }}             # [linux]
+    - {{ cdt('libxfixes-devel') }}       # [linux]
+    - {{ cdt('libxxf86vm') }}            # [linux]
+    - {{ cdt('libxxf86vm-devel') }}      # [linux]
+    - {{ cdt('libsm-devel') }}           # [linux]
+    - {{ cdt('libice-devel') }}          # [linux]
+    - {{ cdt('libxcb') }}                # [linux]
+    - {{ cdt('libxcb-devel') }}          # [linux]
+    - {{ cdt('expat-devel') }}           # [linux]
+    - {{ cdt('pcre') }}                  # [linux]
+    - {{ cdt('libglvnd-glx') }}          # [linux]
+    - {{ cdt('libglvnd-egl') }}          # [linux]
+    - {{ cdt('libxkbcommon-devel') }}    # [linux]
+    - {{ cdt('xcb-util-devel') }}        # [linux]
+    - {{ cdt('xcb-util-image-devel') }}  # [linux]
+    - {{ cdt('xcb-util-keysyms-devel') }}     # [linux]
+    - {{ cdt('xcb-util-renderutil-devel') }}  # [linux]
+    - {{ cdt('xcb-util-wm-devel') }}          # [linux]
+  host:
+    # - qt-base  {{ version }}
+    - qt-main {{ version }}
+    - glib
+    - gtk3
+    - pango
+    - atk
+    - cairo
+    - gdk-pixbuf
+    - xorg-libxinerama
+  run:
+    # We want to be pinned to the exact qt version
+    # - qt-base {{ version }}
+    - qt-main {{ version }}
+
+test:
+  commands:
+    - test -f "${PREFIX}/plugins/platformthemes/libqgtk3${SHLIB_EXT}"
+
+about:
+  home: http://qt-project.org
+  license: LGPL-3.0-only
+  license_file: LICENSE.LGPLv3
+  summary: Qt GTK3 platform theme
+  dev_url: https://github.com/qt/qtbase/tree/5.15/src/plugins/platformthemes/gtk3
+
+
+extra:
+  recipe-maintainers:
+    - conda-forge/qt-main