configure: Do not generate two stage0 rustlib dirs when --libdir is set #31074
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This fixes #27254. On a 64-bit Linux machine, for example, `configure --libdir=/usr/local/lib64` was creating both `x86_64-unknown-linux-gnu/stage0/lib/rustlib` and `x86_64-unknown-linux-gnu/stage0/lib64/rustlib`. Crates from the stage0 snapshot, like `libcore`, are extracted to `x86_64-unknown-linux-gnu/stage0/lib/rustlib`, but the stage0 compiler was attempting to find them in `x86_64-unknown-linux-gnu/stage0/lib64/rustlib`, which has the highest priority on a 64-bit system. The issue can be fixed by creating only `x86_64-unknown-linux-gnu/stage0/lib/rustlib`, since this is the only rustlib directory needed for stage0 anyways.
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This fixes #27254.
On a 64-bit Linux machine, for example,
configure --libdir=/usr/local/lib64was creating bothx86_64-unknown-linux-gnu/stage0/lib/rustlibandx86_64-unknown-linux-gnu/stage0/lib64/rustlib. Crates from the stage0 snapshot, likelibcore, are extracted tox86_64-unknown-linux-gnu/stage0/lib/rustlib, but the stage0 compiler was attempting to find them inx86_64-unknown-linux-gnu/stage0/lib64/rustlib, which has the highest priority on a 64-bit system.The issue can be fixed by creating only
x86_64-unknown-linux-gnu/stage0/lib/rustlib, since this is the only rustlib directory needed for stage0 anyways.