Here is a list of optional arguments you can pass to the compiler:

• --suppress-unimplemented - Suppresses most warnings related to unimplemented procs/vars. At the moment, using this is highly recommended unless you're actively trying to find things to implement.
• --dump-preprocessor - Dumps the output of the preprocessor to a DM file in the same dir as the file you're compiling. Useful for debugging preprocessor errors.
• --no-standard - Excludes the standard library. This will likely cause compilation to fail.
• --verbose - The compiler will print more details about what it's currently doing. Mainly useful if you think you're getting stuck in an infinite loop.
• --skip-bad-args - Passing an invalid arg to OpenDream will result in a compiler warning instead of a compiler error. This is to make life easier for developers, and will be removed when the compiler is more stable.
• --notices-enabled - By default, OpenDream will suppress pragmas that are set to notice. Passing this arg un-suppresses them.
• --version - Used to override the default DM_VERSION and DM_BUILD. Example usage: --version=514.1583
• --print-code-tree - Prints the tree of types, procs, and vars assembled between parsing and compilation. This plays a major role in the order that global/static vars initialize.
• --no-opts - Disables most compile-time optimizations of the DM code (e.g. const-folding). Mainly for debugging.