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doc: document Temporal configure flags in BUILDING.md #63248

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15 changes: 14 additions & 1 deletion BUILDING.md
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Expand Up @@ -1045,11 +1045,24 @@ enable FIPS support in Node.js.
Node.js supports the [Temporal](https://github.com/tc39/proposal-temporal) APIs, when
linking statically or dynamically with a version of [temporal\_rs](https://github.com/boa-dev/temporal).

To build Node.js with Temporal support, a Rust toolchain is required:
Temporal support is enabled by default starting in Node.js 26. Building it
requires a Rust toolchain:

* rustc >= 1.82 (with LLVM >= 19)
* cargo >= 1.82

If `--v8-enable-temporal-support` and `--v8-disable-temporal-support` are both
omitted, `configure.py` probes for `cargo` and `rustc`. If either is missing,
a warning is printed and Temporal support is disabled.

* Pass `--v8-enable-temporal-support` to `configure.py` to require Temporal
support. The build will stop with an error if `cargo` or `rustc` cannot be
found.
* Pass `--v8-disable-temporal-support` to opt out of Temporal support and
remove the Rust toolchain requirement.

Passing both options to `configure.py` is an error.

## Building Node.js with external core modules

It is possible to specify one or more JavaScript text files to be bundled in
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