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plugin: use bare --export-dynamic to expose qt_plugin syms (per-sym form is exec-only)

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Damocles 2026-05-03 22:39:50 +02:00
parent d47200932d
commit 12c5f3283f
1 changed files with 12 additions and 8 deletions
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20
plugin/build.rs
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@ -1,17 +1,21 @@
use cxx_qt_build::{CxxQtBuilder, PluginType, QmlModule};
fn main() {
// cc-rs compiles with -ffunction-sections, Rust's cdylib link runs --gc-sections,
// and nothing internal references qt_plugin_instance/qt_plugin_query_metadata_v2
// - moc generates them as Qt's plugin entry points for dlopen, not for in-binary
// calls. So the linker drops them entirely (verified: `nm libNovaStats.so | grep
// qt_plugin_instance` returns nothing, only the static const inside the dropped
// function survives). --undefined anchors them past --gc-sections, then
// --export-dynamic-symbol exposes them for Qt's dlsym lookup.
// Two separate problems to defeat in the cdylib link:
// 1. cc-rs uses -ffunction-sections, Rust's cdylib runs --gc-sections, and
// nothing internal references qt_plugin_instance / qt_plugin_query_metadata_v2
// (moc emits them as dlsym entry points for Qt's plugin loader, not for
// in-binary calls), so the linker drops them entirely. --undefined=<sym>
// anchors them past --gc-sections.
// 2. Even once present, Rust's cdylib link hides C++ static-archive symbols by
// default - they end up as local (lowercase t in nm), invisible to dlsym.
// --export-dynamic-symbol=<sym> doesn't help: that flag only applies to
// -shared=no (executables). For shared libraries, bare --export-dynamic
// exports all global symbols and overrides the hide-by-default.
for sym in ["qt_plugin_instance", "qt_plugin_query_metadata_v2"] {
println!("cargo:rustc-link-arg=-Wl,--undefined={sym}");
println!("cargo:rustc-link-arg=-Wl,--export-dynamic-symbol={sym}");
}
println!("cargo:rustc-link-arg=-Wl,--export-dynamic");
// Crane's deps-only build stubs out lib.rs and removes our bridge sources to
// build a dummy crate that only compiles dependencies. Skip cxx-qt codegen in