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From Odwiki

vcc is the standalone VEX compiler.

Purpose

VEX is a source language which has to be compiled into a byte-code representation before it can be used in Houdini or Mantra. vcc is the commandline compiler which will compile vex source code (.vfl files) into byte-code (.vex files) or into OTL files (which can be loaded directly into Houdini using the File>Install Operator Type Libraries and so on).

vcc will either create a standalone node in the context for which is was written, or optionally try to convert the code into a VOP node so it may be used in conjunction with other VOPs.

If you run vcc -h list of options to the compiler will be displayed.

Listing all VEX functions

It's also possible to run vcc -X context_name to see a list of all the VEX functions available in the context_name. The context_name should be one of the following.

• surface
• displacement
• light
• shadow
• atmosphere (fog also works)
• sop
• pop
• cop2 (cop also works)
• chop
• image3d

You will probably want to run the output of the -X option through a pager, like more or less.