37 lines
1.9 KiB
Rust
37 lines
1.9 KiB
Rust
use cxx_qt_build::{CxxQtBuilder, PluginType, QmlModule};
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fn main() {
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// Two separate problems to defeat in the cdylib link for cxx-qt's QML plugin
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// entry points (qt_plugin_instance / qt_plugin_query_metadata_v2):
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// 1. cc-rs uses -ffunction-sections, Rust's cdylib runs --gc-sections, and
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// nothing internal references those symbols (moc emits them as dlsym
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// entry points), so the linker drops them entirely. --undefined=<sym>
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// anchors them past --gc-sections.
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// 2. Rust's cdylib link passes an explicit --version-script that lists Rust
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// public symbols under `global:` and ends with `local: *;`, hiding
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// everything else. --dynamic-list and --export-dynamic both lose to that
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// `local: *;`. Multiple --version-script flags merge per ld(1), and
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// explicit `global:` entries override the wildcard local, so we pass a
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// second version script that adds the qt_plugin entry points.
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for sym in ["qt_plugin_instance", "qt_plugin_query_metadata_v2"] {
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println!("cargo:rustc-link-arg=-Wl,--undefined={sym}");
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}
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let vscript = std::path::Path::new(env!("CARGO_MANIFEST_DIR")).join("qt_plugin_exports.txt");
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println!("cargo:rerun-if-changed={}", vscript.display());
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println!(
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"cargo:rustc-link-arg=-Wl,--version-script={}",
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vscript.display()
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);
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// Crane's deps-only build stubs out lib.rs and removes our bridge sources to
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// build a dummy crate that only compiles dependencies. Skip cxx-qt codegen in
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// that case - we just want cxx-qt-lib (the heavy dep) cached, not our own glue.
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let bridge_files = ["src/system_stats.rs", "src/cpu_service.rs"];
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if !bridge_files.iter().all(|p| std::path::Path::new(p).exists()) {
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return;
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}
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CxxQtBuilder::new_qml_module(QmlModule::new("NovaStats").plugin_type(PluginType::Dynamic))
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.files(bridge_files)
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.build();
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}
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