Files
rust/tests/codegen
Matthias Krüger 33b1264540 Rollup merge of #131519 - davidlattimore:intrinsics-default-vis, r=Urgau
Use Default visibility for rustc-generated C symbol declarations

Non-default visibilities should only be used for definitions, not declarations, otherwise linking can fail.

This is based on https://github.com/rust-lang/rust/pull/123994.

Issue https://github.com/rust-lang/rust/issues/123427

When I changed `default-hidden-visibility` to `default-visibility` in https://github.com/rust-lang/rust/pull/130005, I updated all places in the code that used `default-hidden-visibility`, replicating the hidden-visibility bug to also happen for protected visibility.

Without this change, trying to build rustc with `-Z default-visibility=protected` fails with a link error.
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The files here use the LLVM FileCheck framework, documented at https://llvm.org/docs/CommandGuide/FileCheck.html.

One extension worth noting is the use of revisions as custom prefixes for FileCheck. If your codegen test has different behavior based on the chosen target or different compiler flags that you want to exercise, you can use a revisions annotation, like so:

// revisions: aaa bbb
// [bbb] compile-flags: --flags-for-bbb

After specifying those variations, you can write different expected, or explicitly unexpected output by using <prefix>-SAME: and <prefix>-NOT:, like so:

// CHECK: expected code
// aaa-SAME: emitted-only-for-aaa
// aaa-NOT:                        emitted-only-for-bbb
// bbb-NOT:  emitted-only-for-aaa
// bbb-SAME:                       emitted-only-for-bbb