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Document that build.description affects symbol mangling and crate IDs #149355

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Nov 27, 2025
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Document that build.description affects symbol mangling and crate IDs #149355

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5 changes: 5 additions & 0 deletions bootstrap.example.toml
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Expand Up @@ -220,6 +220,11 @@
# which is also used in places like debuginfo `DW_AT_producer`. This may be useful for
# supplementary build information, like distro-specific package versions.
#
# IMPORTANT: Changing this value changes crate IDs and symbol name mangling, making
# compiled artifacts incompatible. PGO profiles cannot be reused across different
# descriptions, and incremental compilation caches are invalidated. Keep this value
# consistent when reusing build artifacts.
#
# The Rust compiler will differentiate between versions of itself, including
# based on this string, which means that if you wish to be compatible with
# upstream Rust you need to set this to "". However, note that if you set this to "" but
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