31 lines
1.6 KiB
Rust
31 lines
1.6 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:
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// 1. cc-rs uses -ffunction-sections, Rust's cdylib runs --gc-sections, and
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// nothing internal references qt_plugin_instance / qt_plugin_query_metadata_v2
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// (moc emits them as dlsym entry points for Qt's plugin loader, not for
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// in-binary calls), so the linker drops them entirely. --undefined=<sym>
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// anchors them past --gc-sections.
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// 2. Even once present, Rust's cdylib link hides C++ static-archive symbols by
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// default - they end up as local (lowercase t in nm), invisible to dlsym.
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// --export-dynamic-symbol=<sym> doesn't help: that flag only applies to
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// -shared=no (executables). For shared libraries, bare --export-dynamic
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// exports all global symbols and overrides the hide-by-default.
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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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println!("cargo:rustc-link-arg=-Wl,--export-dynamic");
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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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