msbuild, defining Conditional Compilation Symbols

Question

I\'m possibly just blind, but is there a command line to specify conditional compilation symbols in MSBUILD?

I currently have this Line in my buildscript:

Answer 1

/p:DefineConstants is an all or nothing deal.

If you just want to turn off trace symbol, you can't just do it with: msbuild /p:DefineTrace=false

You have to define something to override all the symbols already defined: msbuild /p:DefineConstants="RANDOM-SYMBOL"

Thanks Michael Stum point this hidden rule out I have also wrote a blog about it --- dead link