doc: add builtin module in building.md

Fixes: https://github.com/nodejs/node/issues/12516
Refs: https://github.com/nodejs/node/pull/2497

PR-URL: https://github.com/nodejs/node/pull/17705
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
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Suixinlei 2017-12-16 13:19:16 +08:00 committed by Myles Borins
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@ -386,3 +386,26 @@ and [user guide](https://openssl.org/docs/fips/UserGuide-2.0.pdf).
`/usr/local/ssl/fips-2.0`
8. Build Node.js with `make -j`
9. Verify with `node -p "process.versions.openssl"` (for example `1.0.2a-fips`)
## Building Node.js with external core modules
It is possible to specify one or more JavaScript text files to be bundled in
the binary as builtin modules when building Node.js.
### Unix / macOS
This command will make `/root/myModule.js` available via
`require('/root/myModule')` and `./myModule2.js` available via
`require('myModule2')`.
```console
$ ./configure --link-module '/root/myModule.js' --link-module './myModule2.js'
```
### Windows
To make `./myCustomModule.js` available via `require('myCustomModule')`.
```console
> .\vcbuild link-module './myCustomModule.js'
```