BUILD can be instructed to build an entire source tree recursively using a dirs file. This file resides in a directory that contains subdirectories (for example, at the root of a source code tree or subtree). Each subdirectory can be a source directory or another source tree. A dirs file should exist at the root of each source code subtree, and a sources file should exist in each “leaf” directory (that is, directories containing actual source code).
You can define the following macros in a dirs file:
By default, BUILD causes all x86 compilations to occur at warning level 3. You can override this warning level by defining the following in the sources file:
386_WARNING_LEVEL=-W4