rustbuild: i686 rustc artifact is gone

[xen0n]

This is the reason of nightly packaging failing. I strongly suspect my own #38468 for that, although I don't yet know why the artifact is skipped in the first place. I'll investigate further.

[xen0n]

Indeed:

In step.rs we have some logic to presumably shave off some test time by checking if the rule is host-only, limiting the cross product to hosts array if applicable. However after #38468 the hosts array only consists of the build triple, so the output of host rules is effectively filtered to build-triple-only.

My apologies. Patch pending.

[xen0n]

Opened #38639.

Before #38468: (some additional debug info added by me, not present in the PR)

target rule dist-analysis: hosts=["x86_64-unknown-linux-gnu", "i686-unknown-linux-gnu"] arr=["x86_64-unknown-linux-gnu", "i686-unknown-linux-gnu"]
host rule dist-src: hosts=["x86_64-unknown-linux-gnu", "i686-unknown-linux-gnu"] arr=["x86_64-unknown-linux-gnu", "i686-unknown-linux-gnu"]
target rule dist-std: hosts=["x86_64-unknown-linux-gnu", "i686-unknown-linux-gnu"] arr=["x86_64-unknown-linux-gnu", "i686-unknown-linux-gnu"]
target rule dist-docs: hosts=["x86_64-unknown-linux-gnu", "i686-unknown-linux-gnu"] arr=["x86_64-unknown-linux-gnu", "i686-unknown-linux-gnu"]
target rule dist-mingw: hosts=["x86_64-unknown-linux-gnu", "i686-unknown-linux-gnu"] arr=["x86_64-unknown-linux-gnu", "i686-unknown-linux-gnu"]
host rule dist-rustc: hosts=["x86_64-unknown-linux-gnu", "i686-unknown-linux-gnu"] arr=["x86_64-unknown-linux-gnu", "i686-unknown-linux-gnu"]
bootstrap top targets:
        Step { name: "dist-analysis", stage: 2, host: "x86_64-unknown-linux-gnu", target: "x86_64-unknown-linux-gnu" }
        Step { name: "dist-analysis", stage: 2, host: "x86_64-unknown-linux-gnu", target: "i686-unknown-linux-gnu" }
        Step { name: "dist-analysis", stage: 2, host: "i686-unknown-linux-gnu", target: "x86_64-unknown-linux-gnu" }
        Step { name: "dist-analysis", stage: 2, host: "i686-unknown-linux-gnu", target: "i686-unknown-linux-gnu" }
        Step { name: "dist-src", stage: 2, host: "x86_64-unknown-linux-gnu", target: "x86_64-unknown-linux-gnu" }
        Step { name: "dist-src", stage: 2, host: "x86_64-unknown-linux-gnu", target: "i686-unknown-linux-gnu" }
        Step { name: "dist-src", stage: 2, host: "i686-unknown-linux-gnu", target: "x86_64-unknown-linux-gnu" }
        Step { name: "dist-src", stage: 2, host: "i686-unknown-linux-gnu", target: "i686-unknown-linux-gnu" }
        Step { name: "dist-std", stage: 2, host: "x86_64-unknown-linux-gnu", target: "x86_64-unknown-linux-gnu" }
        Step { name: "dist-std", stage: 2, host: "x86_64-unknown-linux-gnu", target: "i686-unknown-linux-gnu" }
        Step { name: "dist-std", stage: 2, host: "i686-unknown-linux-gnu", target: "x86_64-unknown-linux-gnu" }
        Step { name: "dist-std", stage: 2, host: "i686-unknown-linux-gnu", target: "i686-unknown-linux-gnu" }
        Step { name: "dist-docs", stage: 2, host: "x86_64-unknown-linux-gnu", target: "x86_64-unknown-linux-gnu" }
        Step { name: "dist-docs", stage: 2, host: "x86_64-unknown-linux-gnu", target: "i686-unknown-linux-gnu" }
        Step { name: "dist-docs", stage: 2, host: "i686-unknown-linux-gnu", target: "x86_64-unknown-linux-gnu" }
        Step { name: "dist-docs", stage: 2, host: "i686-unknown-linux-gnu", target: "i686-unknown-linux-gnu" }
        Step { name: "dist-mingw", stage: 2, host: "x86_64-unknown-linux-gnu", target: "x86_64-unknown-linux-gnu" }
        Step { name: "dist-mingw", stage: 2, host: "x86_64-unknown-linux-gnu", target: "i686-unknown-linux-gnu" }
        Step { name: "dist-mingw", stage: 2, host: "i686-unknown-linux-gnu", target: "x86_64-unknown-linux-gnu" }
        Step { name: "dist-mingw", stage: 2, host: "i686-unknown-linux-gnu", target: "i686-unknown-linux-gnu" }
        Step { name: "dist-rustc", stage: 2, host: "x86_64-unknown-linux-gnu", target: "x86_64-unknown-linux-gnu" }
        Step { name: "dist-rustc", stage: 2, host: "x86_64-unknown-linux-gnu", target: "i686-unknown-linux-gnu" }
        Step { name: "dist-rustc", stage: 2, host: "i686-unknown-linux-gnu", target: "x86_64-unknown-linux-gnu" }
        Step { name: "dist-rustc", stage: 2, host: "i686-unknown-linux-gnu", target: "i686-unknown-linux-gnu" }

After #38468, before #38639:

host rule dist-rustc: hosts=["x86_64-unknown-linux-gnu"] arr=["x86_64-unknown-linux-gnu"]
target rule dist-analysis: hosts=["x86_64-unknown-linux-gnu"] arr=["x86_64-unknown-linux-gnu", "i686-unknown-linux-gnu"]
target rule dist-std: hosts=["x86_64-unknown-linux-gnu"] arr=["x86_64-unknown-linux-gnu", "i686-unknown-linux-gnu"]
target rule dist-mingw: hosts=["x86_64-unknown-linux-gnu"] arr=["x86_64-unknown-linux-gnu", "i686-unknown-linux-gnu"]
host rule dist-src: hosts=["x86_64-unknown-linux-gnu"] arr=["x86_64-unknown-linux-gnu"]
target rule dist-docs: hosts=["x86_64-unknown-linux-gnu"] arr=["x86_64-unknown-linux-gnu", "i686-unknown-linux-gnu"]
bootstrap top targets:
        Step { name: "dist-rustc", stage: 2, host: "x86_64-unknown-linux-gnu", target: "x86_64-unknown-linux-gnu" }
        Step { name: "dist-analysis", stage: 2, host: "x86_64-unknown-linux-gnu", target: "x86_64-unknown-linux-gnu" }
        Step { name: "dist-analysis", stage: 2, host: "x86_64-unknown-linux-gnu", target: "i686-unknown-linux-gnu" }
        Step { name: "dist-std", stage: 2, host: "x86_64-unknown-linux-gnu", target: "x86_64-unknown-linux-gnu" }
        Step { name: "dist-std", stage: 2, host: "x86_64-unknown-linux-gnu", target: "i686-unknown-linux-gnu" }
        Step { name: "dist-mingw", stage: 2, host: "x86_64-unknown-linux-gnu", target: "x86_64-unknown-linux-gnu" }
        Step { name: "dist-mingw", stage: 2, host: "x86_64-unknown-linux-gnu", target: "i686-unknown-linux-gnu" }
        Step { name: "dist-src", stage: 2, host: "x86_64-unknown-linux-gnu", target: "x86_64-unknown-linux-gnu" }
        Step { name: "dist-docs", stage: 2, host: "x86_64-unknown-linux-gnu", target: "x86_64-unknown-linux-gnu" }
        Step { name: "dist-docs", stage: 2, host: "x86_64-unknown-linux-gnu", target: "i686-unknown-linux-gnu" }

After:

target rule dist-mingw: hosts=["x86_64-unknown-linux-gnu"] arr=["x86_64-unknown-linux-gnu", "i686-unknown-linux-gnu"]
target rule dist-docs: hosts=["x86_64-unknown-linux-gnu"] arr=["x86_64-unknown-linux-gnu", "i686-unknown-linux-gnu"]
host rule dist-rustc: hosts=["x86_64-unknown-linux-gnu"] arr=["x86_64-unknown-linux-gnu", "i686-unknown-linux-gnu"]
host rule dist-src: hosts=["x86_64-unknown-linux-gnu"] arr=["x86_64-unknown-linux-gnu", "i686-unknown-linux-gnu"]
target rule dist-analysis: hosts=["x86_64-unknown-linux-gnu"] arr=["x86_64-unknown-linux-gnu", "i686-unknown-linux-gnu"]
target rule dist-std: hosts=["x86_64-unknown-linux-gnu"] arr=["x86_64-unknown-linux-gnu", "i686-unknown-linux-gnu"]
bootstrap top targets:
        Step { name: "dist-mingw", stage: 2, host: "x86_64-unknown-linux-gnu", target: "x86_64-unknown-linux-gnu" }
        Step { name: "dist-mingw", stage: 2, host: "x86_64-unknown-linux-gnu", target: "i686-unknown-linux-gnu" }
        Step { name: "dist-docs", stage: 2, host: "x86_64-unknown-linux-gnu", target: "x86_64-unknown-linux-gnu" }
        Step { name: "dist-docs", stage: 2, host: "x86_64-unknown-linux-gnu", target: "i686-unknown-linux-gnu" }
        Step { name: "dist-rustc", stage: 2, host: "x86_64-unknown-linux-gnu", target: "x86_64-unknown-linux-gnu" }
        Step { name: "dist-rustc", stage: 2, host: "x86_64-unknown-linux-gnu", target: "i686-unknown-linux-gnu" }
        Step { name: "dist-src", stage: 2, host: "x86_64-unknown-linux-gnu", target: "x86_64-unknown-linux-gnu" }
        Step { name: "dist-src", stage: 2, host: "x86_64-unknown-linux-gnu", target: "i686-unknown-linux-gnu" }
        Step { name: "dist-analysis", stage: 2, host: "x86_64-unknown-linux-gnu", target: "x86_64-unknown-linux-gnu" }
        Step { name: "dist-analysis", stage: 2, host: "x86_64-unknown-linux-gnu", target: "i686-unknown-linux-gnu" }
        Step { name: "dist-std", stage: 2, host: "x86_64-unknown-linux-gnu", target: "x86_64-unknown-linux-gnu" }
        Step { name: "dist-std", stage: 2, host: "x86_64-unknown-linux-gnu", target: "i686-unknown-linux-gnu" }