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Daniel_Platte Junior Member Offline Posts: 11 Munich/Germany	Feature like IFDEF for Spectre? Feb 06^th, 2007, 7:04am Hi, I would like to change Spectre netlists controlled by an environment variable within a script-automated simulation. Is there a feature like IFDEF for the Spectre netlist parser? How can I access environment variables within the netlist? Example: -> if $DEBUG is set, add additional netlist entries to the simulation Thanks Daniel
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bernd Senior Member Offline Posts: 229 Munich/Germany	Re: Feature like IFDEF for Spectre? Reply #1 - Feb 6^th, 2007, 8:14am In my opinion this is not directly possible within the Analog Environment. I would use a programming language either SKILL or PERL to parse the netlist after it's creation and make the modification. Bernd
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Andrew Beckett

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Life, don't talk to
me about Life...

Posts: 1742
Bracknell, UK

Re: Feature like IFDEF for Spectre?
Reply #2 - Feb 6^th, 2007, 4:17pm

If using spectre from the command line, you can use the -E option to spectre to tell it to use the C preprocessor before spectre parses it.

For example:

Code:

#ifdef MYDEF
// something you want to include
#endif

You can then use spectre -E -DMYDEF mynetlist.scs to pass in particular definitions from the outside.

Regards,

Andrew.

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Daniel_Platte

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Posts: 11
Munich/Germany

Re: Feature like IFDEF for Spectre?
Reply #3 - Feb 7^th, 2007, 12:48am

Thanks for the advice!

Unfortunately, the C-preprocessor does not evaluate Spectre's include statement. As I would need the #ifdef in an options file (that is typically included with Spectre include), the C-preprocessor does not evaluate the #ifdef. Replacing all includes by #include does not solve the problem (and would be very tedious). Shouldn't the C-preprocessor evaluate the #include statements?

Is it possible to combine Spectre's include and the #ifdef directive?

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Andrew Beckett Senior Fellow Offline Life, don't talk to me about Life... Posts: 1742 Bracknell, UK	Re: Feature like IFDEF for Spectre? Reply #4 - Feb 7^th, 2007, 3:38am The C preprocessor does process the #include statements. But it won't process any files which are included with spectre's include statements - because these are processed after cpp has done its job. I can only assume you didn't replace all the includes with #includes? Regards, Andrew.
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