rename build-extra-platforms -> extra-platforms
also document it
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					 2 changed files with 25 additions and 2 deletions
				
			
		|  | @ -254,6 +254,25 @@ false</literal>.</para> | |||
|   </varlistentry> | ||||
| 
 | ||||
| 
 | ||||
|   <varlistentry><term><literal>extra-platforms</literal></term> | ||||
| 
 | ||||
|     <listitem><para>Platforms other than the native one which | ||||
|     this machine is capable of building for. This can be useful for | ||||
|     supporting additional architectures on compatible machines: | ||||
|     i686-linux can be built on x86_64-linux machines (and the default | ||||
|     for this setting reflects this); armv7 is backwards-compatible with | ||||
|     armv6 and armv5tel; some aarch64 machines can also natively run | ||||
|     32-bit ARM code; and qemu-user may be used to support non-native | ||||
|     platforms (though this may be slow and buggy). Most values for this | ||||
|     are not enabled by default because build systems will often | ||||
|     misdetect the target platform and generate incompatible code, so you | ||||
|     may wish to cross-check the results of using this option against | ||||
|     proper natively-built versions of your | ||||
|     derivations.</para></listitem> | ||||
| 
 | ||||
|   </varlistentry> | ||||
| 
 | ||||
| 
 | ||||
|   <varlistentry><term><literal>extra-substituters</literal></term> | ||||
| 
 | ||||
|     <listitem><para>Additional binary caches appended to those | ||||
|  |  | |||
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