Re: [sv-bc] Trimming whitespace from macro actuals

From: Coffin, Eric <eric_coffin_at_.....>
Date: Thu Oct 25 2007 - 15:34:52 PDT

Ignoring backward compatibility (for the time being) and implementation details, which source text option is equivalent to the expanded macro?  Assume that the text "<space>" represents a single ASCII character (character number 32).

`define MACRO( A, B )  `"A``B`"

`MACRO( \M<space> , \Q<space> )

Option 1)  "\M\Q<space>"
Option 2) "\M\Q"
Option 3) "\MQ"
Option 4) "\MQ<space>"
Option 5) "\M<space>\Q<space>"
Option 6) "\MQ`"                Note that this is a quote followed by an escaped identifier \MQ`"

Undefined interactions exist between escaped identifiers, token pasting (gluing) and the `" macro operation.  Passing something may not be better than nothing in this case.

-Eric

Bresticker, Shalom wrote:

Even if it's not perfect, let's pass something which is better than
nothing.

Shalom 

  

-----Original Message-----
From: owner-sv-bc@server.eda.org 
[mailto:owner-sv-bc@server.eda.org] On Behalf Of Bresticker, Shalom
Sent: Sunday, October 21, 2007 2:11 PM
To: sv-bc@server.eda-stds.org
Subject: RE: [sv-bc] Trimming whitespace from macro actuals

This issue, whether and how white space around macro actual 
arguments is stripped off or preserved, was never resolved in 
a proposal to clarify the LRM, so I have filed Mantis 2140 
and the attached proposal.

Please review.

Thanks,
Shalom 

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