DSC macro expansion

["Huber, Brandon" <brandon.huber@hp.com>]

Hi All,

There seems to be a discrepancy between the DSC spec and the EDKII implementation regarding what macros are allowed in !include statements within a DSC file.

>From the spec (v1.26 section 2.2.5):

Macros, defined in this file, are not permitted in the path or file name of the !include statement, as these files are included prior to processing the file for macros. If the path starts with a "$" character, then one of the system environment variables, $(WORKSPACE), $(EDK_SOURCE), $(EFI_SOURCE), or $(ECP_SOURCE) is being used; only these system environment variables are permitted to start the path of the included file.
Yet from experimentation, all macros defined in DSC files seem to be permitted in !include statements by the build tools. Is the spec out of date, or is the code wrong?

I think the code in question is _GetMacros() in BaseTools/Source/Python/Workspace/WorkspaceDatabase.py<https://github.com/tianocore/edk2/commit/0d2711a69397d2971079121df4326d84736c181e#diff-7cfd5e9099421b207e7718d47950d40dR148> (https://github.com/tianocore/edk2/commit/0d2711a69397d2971079121df4326d84736c181e#diff-7cfd5e9099421b207e7718d47950d40dR148).

Thanks,
-Brandon