Files
rust/tests/codegen-llvm
Stuart Cook a528a58a19 Rollup merge of #145954 - RalfJung:syscall-c-variadics, r=jackh726
stabilize extern_system_varargs

Based on top of https://github.com/rust-lang/rust/pull/144066. This has been already FCP'd over there, but `@workingjubilee` has some concerns regarding "system" varargs specifically (IIUC).

Reference PR: https://github.com/rust-lang/reference/pull/2069.
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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