Rewrite `extern-flag-rename-transitive`. `debugger-visualizer-dep-info`, `metadata-flag-frobs-symbols`, `extern-overrides-distribution` and `forced-unwind-terminate-pof` `run-make` tests to rmake
Part of #121876 and the associated [Google Summer of Code project](https://blog.rust-lang.org/2024/05/01/gsoc-2024-selected-projects.html).
try-job: dist-x86_64-apple
Migrate `link-args-order`, `ls-metadata` and `lto-readonly-lib` `run-make` tests to `rmake`
Part of #121876 and the associated [Google Summer of Code project](https://blog.rust-lang.org/2024/05/01/gsoc-2024-selected-projects.html).
Guaranteed to fail CI until #125736 gets merged. Will require addition of `fs_wrapper::set_permissions` in the associated module.
try-job: x86_64-msvc
Migrate `extern-flag-fun`, `incremental-debugger-visualiser` and `incremental-session-fail` `run-make` tests to `rmake.rs`
Part of #121876 and the associated [Google Summer of Code project](https://blog.rust-lang.org/2024/05/01/gsoc-2024-selected-projects.html).
try-job: arm-android
try-job: armhf-gnu
try-job: test-various
try-job: x86_64-msvc
try-job: dist-i686-mingw
run-make: annotate library with `#[must_use]` and enforce `unused_must_use` in rmake.rs
This PR adds `#[must_use]` annotations to functions of the `run_make_support` library where it makes sense, and adjusts compiletest to compile rmake.rs with `-Dunused_must_use`.
The rationale is that it's highly likely that unused `#[must_use]` values in rmake.rs test files are bugs. For example, unused fs/io results are often load-bearing to the correctness of the test and often unchecked fs/io results allow the test to silently pass where it would've failed if the result was checked.
This PR is best reviewed commit-by-commit.
try-job: test-various
try-job: x86_64-msvc
Migrate `run-make/pgo-branch-weights` to `rmake`
Part of #121876 and the associated [Google Summer of Code project](https://blog.rust-lang.org/2024/05/01/gsoc-2024-selected-projects.html).
This is a scary one and I expect things to break. Set as draft, because this isn't ready.
- [x] There is this comment here, which suggests the test is excluded from the testing process due to a platform specific issue? I can't see anything here that would cause this test to not run...
> // FIXME(mati865): MinGW GCC miscompiles compiler-rt profiling library but with Clang it works
// properly. Since we only have GCC on the CI ignore the test for now."
EDIT: This is specific to Windows-gnu.
- [x] The Makefile has this line:
```
ifneq (,$(findstring x86,$(TARGET)))
COMMON_FLAGS=-Clink-args=-fuse-ld=gold
```
I honestly can't tell whether this is checking if the target IS x86, or IS NOT. EDIT: It's checking if it IS x86.
- [x] I don't know why the Makefile was trying to pass an argument directly in the Makefile instead of setting that "aaaaaaaaaaaa2bbbbbbbbbbbb2bbbbbbbbbbbbbbbbcc" input as a variable in the Rust program directly. I changed that, let me know if that was wrong.
- [x] Trying to rewrite `cat "$(TMPDIR)/interesting.ll" | "$(LLVM_FILECHECK)" filecheck-patterns.txt` resulted in some butchery. For starters, in `tools.mk`, LLVM_FILECHECK corrects its own backslashes on Windows distributions, but there is no further mention of it, so I assume this is a preset environment variable... but is it really? Then, the command itself uses a Standard Input and a passed input file as an argument simultaneously, according to the [documentation](https://llvm.org/docs/CommandGuide/FileCheck.html#synopsis).
try-job: aarch64-gnu
