rust/tests/ui/lto/msvc-imp-present.rs

//@ run-pass

//@ aux-build:msvc-imp-present.rs
//@ compile-flags: -Z thinlto -C codegen-units=8
//@ no-prefer-dynamic

// On MSVC we have a "hack" where we emit symbols that look like `_imp_$name`
// for all exported statics. This is done because we apply `dllimport` to all
// imported constants and this allows everything to actually link correctly.
//
// The ThinLTO passes aggressively remove symbols if they can, and this test
// asserts that the ThinLTO passes don't remove these compiler-generated
// `_imp_*` symbols. The external library that we link in here is compiled with
// ThinLTO and multiple codegen units and has a few exported constants. Note
// that we also namely compile the library as both a dylib and an rlib, but we
// link the rlib to ensure that we assert those generated symbols exist.

extern crate msvc_imp_present as bar;

fn main() {
    println!("{}", bar::A);
}