v8/docs/i18n_support.md
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Review URL: https://codereview.chromium.org/1347153006

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2015-09-28 12:41:25 +00:00

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# ECMAScript 402
V8 optionally implements the [ECMAScript 402](http://www.ecma-international.org/ecma-402/1.0/) API. The API is enabled by default, but can be turned off at compile time.
## Prerequisites
The i18n implementation adds a dependency on ICU. If you run
```
make dependencies
```
a suitable version of ICU is checked out into `third_party/icu`.
### Alternative ICU checkout
You can check out the ICU sources at a different location and define the gyp variable `icu_gyp_path` to point at the `icu.gyp` file.
### System ICU
Last but not least, you can compile V8 against a version of ICU installed in your system. To do so, specify the gyp variable `use_system_icu=1`. If you also have `want_separate_host_toolset` enabled, the bundled ICU will still be compiled to generate the V8 snapshot. The system ICU will only be used for the target architecture.
## Embedding V8
If you embed V8 in your application, but your application itself doesn't use ICU, you will need to initialize ICU before calling into V8 by executing:
```
v8::V8::InitializeICU();
```
It is safe to invoke this method if ICU was not compiled in, then it does nothing.
## Compiling without i18n support
To build V8 without i18n support use
```
make i18nsupport=off native
```