`tests/run-make/print-target-list` `--print=sysroot` check fails for experimental llvm targets

[jieyouxu]

In #127877 @rejyr noticed tests/run-make/print-target-list was failing for csky-unknown-linux-gnuabiv2 (and other experimental llvm components) on the x86_64-gnu-llvm-17 CI builder with

# snip
error: could not create LLVM TargetMachine for triple: csky-unknown-linux-gnuabiv2: No available targets are compatible with triple "csky-unknown-linux-gnuabiv2"
# snip

#125702 (specifically #125702 (comment)) it was already noticed that tests/run-make/print-target-list seemed to fail for csky-unknown-linux-gnuabiv2.

Is this expected? Or what is the expected test behavior when

rustc --target csky-unknown-linux-gnuabiv2 --print sysroot

is ran (on the x86_64-gnu-llvm-17 CI builder)?

Or is it expected that we should skip trying to run this check for the csky-unknown-linux-gnuabiv2 and other experimental llvm component targets?

---

Update: this is also true for experimental llvm components avr, m68k, csky and xtensa, not too sure what the correct behavior is. Currently these targets are skipped by print-target-list's --print=sysroot check.

[Dirreke]

Is there any COMPILETEST_NEEDS_ALL_LLVM_COMPONENTS set by us for this jobs?. It seems like the same issue. I will check it later.

[Dirreke]

Well, I'm not familiar with rmake.

However, the right logic should be like:

If COMPILETEST_NEEDS_ALL_LLVM_COMPONENTS is not set and LLVM_COMPONENTS do not have the csky, then we could skip it.

COMPILETEST_NEEDS_ALL_LLVM_COMPONENTS is set at src/ci/run.sh, and it is only used at src/tools/compiletest/src/header.rs now.

[jieyouxu]

Ah thank you, that sounds about right.