update readme to explain floating point printf configuration
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readme.md
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readme.md
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@ -11,3 +11,28 @@ probably not succeed without target-specific startup code).
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See [CHANGELOG.md](CHANGELOG.md) for the changes associated with
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each version.
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## Configuring floating point support in `printf`
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Floating point support in `printf` is enabled by default by this target
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description. (Although derived targets may override this behaviour through the
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[yotta config](http://yottadocs.mbed.com/reference/config.html) system.)
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If you need to change the default behaviour (perhaps because the increase in
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code-size is unacceptable to you), then you can do this in the `config` section
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of a target description, or in an application's `config.json` file:
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```JSON
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"gcc": {
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"printf-float": false
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}
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```
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Or:
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```JSON
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"gcc": {
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"printf-float": true
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}
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```
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