tests/ui/lto/issue-105637.rs

   1 // Regression test for issue #105637: `-Zdylib-lto` with LTO duplicated symbols from other dylibs,
   2 // in this case from libstd.
   3 //
   4 // That manifested as both `rustc_driver` and rustc's "main" (`compiler/rustc`) having their own
   5 // `std::panicking::HOOK` static, and the hook in rustc's main (the default stdlib's) being executed
   6 // when rustc ICEs, instead of the overriden hook from `rustc_driver` (which also displays the query
   7 // stack and information on how to open a GH issue for the encountered ICE).
   8 //
   9 // In this test, we reproduce this setup by installing a panic hook in both the main and an LTOed
  10 // dylib: the last hook set should be the one being executed, the dylib's.
  11
  12 // aux-build: thinlto-dylib.rs
  13 // run-fail
  14 // check-run-results
  15
  16 extern crate thinlto_dylib;
  17
  18 use std::panic;
  19
  20 fn main() {
  21     // We don't want to see this panic hook executed
  22     std::panic::set_hook(Box::new(|_| {
  23         eprintln!("main crate panic hook");
  24     }));
  25
  26     // Have the LTOed dylib install its own hook and panic, we want to see its hook executed.
  27     thinlto_dylib::main();
  28 }