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docs: further tweak rerun-if-env-changed docs #12489

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docs: further tweak rerun-if-env-changed docs #12489

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5 changes: 3 additions & 2 deletions src/doc/src/reference/build-scripts.md
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Expand Up @@ -349,8 +349,9 @@ Note that the environment variables here are intended for global environment
variables like `CC` and such, it is not possible to use this for environment
variables like `TARGET` that [Cargo sets for build scripts][build-env]. The
environment variables in use are those received by `cargo` invocations, not
those received by the executable of the build script.

those received by the executable of the build script. Due to Cargo's
internal cache invalidation Cargo will effectively re-run the build script
every time one of the variables that Cargo sets changes.

### The `links` Manifest Key

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