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// Linkers treat archives differently from object files: all object files participate in linking,
// while archives will only participate in linking if they can satisfy at least one undefined
// reference (version scripts doesn't count). This causes `#[no_mangle]` or `#[used]` items to
// be ignored by the linker, and since they never participate in the linking, using `KEEP` in the
// linker scripts can't keep them either. This causes #47384. After the fix in #95604, this test
// checks that these symbols and sections successfully appear in the output dynamic library.
// See https://github.com/rust-lang/rust/pull/95604
// See https://github.com/rust-lang/rust/issues/47384
//@ ignore-cross-compile
//@ needs-crate-type: cdylib
//@ needs-dynamic-linking
//@ ignore-wasm differences in object file formats causes errors in the llvm_objdump step.
//@ ignore-windows differences in object file formats causes errors in the llvm_objdump step.
use run_make_support::{dynamic_lib_name, llvm_objdump, llvm_readobj, rustc, target};
fn main() {
rustc().crate_type("lib").input("lib.rs").run();
let mut main = rustc();
main.crate_type("cdylib");
if target().contains("linux") {
main.link_args("-Tlinker.ld");
}
main.input("main.rs").run();
// Ensure `#[used]` and `KEEP`-ed section is there
llvm_objdump()
.arg("--full-contents")
.arg("--section=.static")
.input(dynamic_lib_name("main"))
.run();
// Ensure `#[no_mangle]` symbol is there
llvm_readobj()
.arg("--symbols")
.input(dynamic_lib_name("main"))
.run()
.assert_stdout_contains("bar");
}
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