The build commands with their proper names can be found in the Build -> Advanced Build Commands submenu.
If you right click on your BSP in the Solution Explorer you get build commands that affect your BSP ONLY:
Build = This builds the BSP (blddemo -qbsp)
Rebuild = This rebuilds the BSP (blddemo clean -qbsp)
Sysgen = This sysgens the BSP (platform.reg, .bib, etc)
Build and Sysgen = combination of build and sysgen (doh!)
Rebuild and clean sysgen = combination of rebuild and sysgen (doh!)
Note that the above "Build and Sysgen" commands are completely safe commands (they only affect your BSP tree for which you have all the source).
Re: Compact 2013
Everything in this blog post is still valid for WEC2013.
Luckily MS has finally removed the dangerous build commands (blddemo without -q) in WEC2013, so you don't have to worry about those anymore.
Build solution = sysgen (blddemo -q)
Rebuild solution = clean sysgen (blddemo clean -q)
The build commands with their proper names can be found in the Build -> Advanced Build Commands submenu.
If you right click on your BSP in the Solution Explorer you get build commands that affect your BSP ONLY:
Build = This builds the BSP (blddemo -qbsp)
Rebuild = This rebuilds the BSP (blddemo clean -qbsp)
Sysgen = This sysgens the BSP (platform.reg, .bib, etc)
Build and Sysgen = combination of build and sysgen (doh!)
Rebuild and clean sysgen = combination of rebuild and sysgen (doh!)
Note that the above "Build and Sysgen" commands are completely safe commands (they only affect your BSP tree for which you have all the source).
I've updated and reposted this blog item for WEC2013 here: http://guruce.com/blogpost/what-to-build-when-in-wec2013