From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:02:58 +0200 Subject: Adding upstream version 1.64.0+dfsg1. Signed-off-by: Daniel Baumann --- src/test/ui/linkage-attr/linkage1.rs | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 src/test/ui/linkage-attr/linkage1.rs (limited to 'src/test/ui/linkage-attr/linkage1.rs') diff --git a/src/test/ui/linkage-attr/linkage1.rs b/src/test/ui/linkage-attr/linkage1.rs new file mode 100644 index 000000000..deab7a251 --- /dev/null +++ b/src/test/ui/linkage-attr/linkage1.rs @@ -0,0 +1,32 @@ +// run-pass +// ignore-windows +// ignore-macos +// ignore-emscripten doesn't support this linkage +// ignore-sgx weak linkage not permitted +// aux-build:linkage1.rs + +#![feature(linkage)] + +extern crate linkage1 as other; + +extern "C" { + #[linkage = "extern_weak"] + static foo: *const isize; + #[linkage = "extern_weak"] + static something_that_should_never_exist: *mut isize; +} + +fn main() { + // It appears that the --as-needed flag to linkers will not pull in a dynamic + // library unless it satisfies a non weak undefined symbol. The 'other' crate + // is compiled as a dynamic library where it would only be used for a + // weak-symbol as part of an executable, so the dynamic library would be + // discarded. By adding and calling `other::bar`, we get around this problem. + other::bar(); + + unsafe { + assert!(!foo.is_null()); + assert_eq!(*foo, 3); + assert!(something_that_should_never_exist.is_null()); + } +} -- cgit v1.2.3