test: Add BusyBox ar compatibility test for issue #504 #1634
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Fixes compilation failures when using BusyBox ar on Windows (and other platforms with non-GNU ar implementations). BusyBox's ar doesn't support the -s flag for symbol table generation. This change adds graceful fallback behavior: 1. Try ar s first (works with GNU ar and most implementations) 2. If ar s fails, fall back to ranlib (equivalent functionality) 3. If ranlib fails/unavailable, continue without symbol tables (acceptable as symbol tables are an optimization, not a requirement) Includes comprehensive cross-platform test coverage that verifies the fallback mechanism works correctly. Fixes rust-lang#504
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Add serial_test dependency and use #[serial] attribute to ensure the busybox_ar_fallback test runs serially, not in parallel with other tests. This prevents cross-contamination where the custom ar/ranlib scripts from this test interfere with other tests running concurrently in CI. Fixes CI failures where tests tried to write to directories belonging to other test instances.
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Fixes compilation failures when using BusyBox ar on Windows.
BusyBox's ar doesn't support the -s flag, so we now gracefully fall back to ranlib when ar s fails.
Includes comprehensive test coverage and backward compatible with GNU ar
Fixes #504