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pre-populate QT_PLUGIN_PATH from CMake #122

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Merged
nim65s merged 2 commits into from
Feb 18, 2026
Merged

pre-populate QT_PLUGIN_PATH from CMake #122

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18e5735
pre-populate QT_PLUGIN_PATH from CMake
nim65s Feb 18, 2026
181c78c
nix: wayland only on linux
nim65s Feb 18, 2026
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37 changes: 37 additions & 0 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -192,6 +192,43 @@ set_target_properties(
OUTPUT_NAME "graph_viewer"
LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/pyhpp_plot")

# pyhpp_plot_graph_viewer is a python module that spawn Qt windows. for this, at
# runtime, it need a QT_PLUGIN_PATH env var with a path where the shared lib for
# the current Qt "platform" are. Here we find a QT_PLUGIN_PATH that would work
# at config time, so that at runtime we can append that as a default fallback,
# if a end user has Qt installed in a non-FHS standard place and did not
# manually tune their $QT_PLUGIN_PATH env var for it

set(QT_PLUGIN_PATH_CMAKE)

# First, we might need to manually discover platforms plugins which are not
# installed in the same prefix as Qt5Gui. eg. Wayland.
find_package(
Qt5 CONFIG
COMPONENTS WaylandClient
QUIET)
if(Qt5WaylandClient_FOUND)
cmake_path(GET Qt5WaylandClient_DIR PARENT_PATH _p)
file(GLOB pluginTargets "${_p}/Qt5Gui/Qt5Gui_*.cmake")
if(pluginTargets)
foreach(pluginTarget ${pluginTargets})
include(${pluginTarget})
endforeach()
endif()
endif()

foreach(p IN LISTS Qt5Gui_PLUGINS)
get_target_property(_l ${p} IMPORTED_LOCATION_RELEASE)
cmake_path(GET _l PARENT_PATH _pp)
cmake_path(GET _pp PARENT_PATH _ppp)
if(NOT _ppp IN_LIST QT_PLUGIN_PATH_CMAKE)
set(QT_PLUGIN_PATH_CMAKE ${QT_PLUGIN_PATH_CMAKE} ${_ppp})
endif()
endforeach()

add_compile_definitions(
"QT_PLUGIN_PATH_CMAKE=\"$<JOIN:${QT_PLUGIN_PATH_CMAKE},:>\"")

install(TARGETS pyhpp_plot_graph_viewer
DESTINATION "${PYTHON_SITELIB}/pyhpp_plot")

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6 changes: 4 additions & 2 deletions flake.nix
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Expand Up @@ -25,7 +25,9 @@
{
packages = {
default = self'.packages.hpp-plot;
hpp-plot = pkgs.python3Packages.hpp-plot.overrideAttrs {
hpp-plot = pkgs.python3Packages.hpp-plot.overrideAttrs (super: {
buildInputs =
super.buildInputs ++ lib.optional (pkgs.stdenv.hostPlatform.isLinux) pkgs.libsForQt5.qtwayland;
src = lib.fileset.toSource {
root = ./.;
fileset = lib.fileset.unions [
Expand All @@ -39,7 +41,7 @@
./src
];
};
};
});
};
};
};
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11 changes: 11 additions & 0 deletions src/pyhpp_plot/graph_viewer.cc
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Expand Up @@ -237,6 +237,17 @@ void showInteractiveGraph(bp::object py_graph, bp::object node_callback,
} // namespace

BOOST_PYTHON_MODULE(graph_viewer) {
// Append what was found at build time to QT_PLUGIN_PATH
// so users dont need to set it, even if their platform plugin
// is in non-standard place. They can still define the env
// var to override this behavior.
auto plugin_paths = qgetenv("QT_PLUGIN_PATH");
if (!plugin_paths.isEmpty()) {
plugin_paths.append(":");
}
plugin_paths.append(QT_PLUGIN_PATH_CMAKE);
qputenv("QT_PLUGIN_PATH", plugin_paths);

// Expose MenuActionProxy for adding menu actions from Python
bp::class_<MenuActionProxy, boost::noncopyable>("MenuActionProxy",
bp::no_init)
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