CCS v5 Preprocessor introduces spurious whitespace

The C preprocessor is not designed to work with assembly code.  You might want to consider using the assembly macro facility:

Xpush .macro reg
     pushx.a reg
     .endm

Thank you for your response.

The .macro facility would not be helpful in this context.

Even although the preprocessor isn't designed to work with assembler, it's not clear why addition of whitespace is desirable in a 'C' context. Surely the preprocessor doesn't need to know what the underlying code means.

What I'm trying to do is have a mixed project, mostly 'C' with a few.asms, employing a single set of (complicatedly interrelated) header files to allow deployment on various processors from the range, automatically including code for those functional elements that are available.  I'm porting the project from a competing environment, where integration of the various components was more straghtforward.

Apart from this one problem, it all works, so it's a shame.  It sounds as if I'd be better using the GNU preprocessor for the assembler modules, but that complicates the makefiles. 

Another option that may work is the .cdecls directive.  This directive is designed to allow assembly code to use information in C header files.  An overview can be found in the presentation on this Wiki page.  The details can be found in the MSP430 Assembly Language Tools book.  In both cases, search on the term "cdecls".

Thanks and regards,

-George

Excellent - that fixes it with no downside. Many thanks for the help.