mirror of https://github.com/rust-lang/rust
42 lines
1.7 KiB
Rust
42 lines
1.7 KiB
Rust
// When native libraries are passed to the linker, there used to be an annoyance
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// where multiple instances of the same library in a row would cause duplication in
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// outputs. This has been fixed, and this test checks that it stays fixed.
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// With the --cfg flag, -ltestb gets added to the output, breaking up the chain of -ltesta.
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// Without the --cfg flag, there should be a single -ltesta, no more, no less.
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// See https://github.com/rust-lang/rust/pull/84794
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use std::fmt::Write;
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use run_make_support::{is_msvc, rustc};
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fn main() {
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rustc().input("depa.rs").run();
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rustc().input("depb.rs").run();
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rustc().input("depc.rs").run();
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let output = rustc().input("empty.rs").cfg("bar").run_fail();
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output.assert_stderr_contains(needle_from_libs(&["testa", "testb", "testa"]));
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let output = rustc().input("empty.rs").run_fail();
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output.assert_stderr_contains(needle_from_libs(&["testa"]));
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output.assert_stderr_not_contains(needle_from_libs(&["testb"]));
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output.assert_stderr_not_contains(needle_from_libs(&["testa", "testa", "testa"]));
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// Adjacent identical native libraries are no longer deduplicated if
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// they come from different crates (https://github.com/rust-lang/rust/pull/103311)
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// so the following will fail:
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//output.assert_stderr_not_contains(needle_from_libs(&["testa", "testa"]));
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}
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fn needle_from_libs(libs: &[&str]) -> String {
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let mut needle = String::new();
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for lib in libs {
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if is_msvc() {
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let _ = needle.write_fmt(format_args!(r#""{lib}.lib" "#));
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} else {
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let _ = needle.write_fmt(format_args!(r#""-l{lib}" "#));
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}
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}
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needle.pop(); // remove trailing space
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needle
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}
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