Experimental Physics and Industrial Control System

On Tuesday 04 April 2006 17:43, J. Lewis Muir wrote:
> A feature I would like is for snc to not generate warning messages
> for variables that are defined in other included source files. For
> example:
>
>    Warning:  variable "asynSuccess" is used but not declared.
>
> I get this message at compile time if I'm using the asyn module and
> want to check the return status of an asyn function call from the SNL
> program. asynSuccess is defined as an asynStatus enum value in
> asynDriver.h which I have included in my SNL program.
>
> These warnings are common when defines or enums or whatever are
> defined in other files and one wants to reference them from the SNL
> program.

This is probably going to be difficult. It would mean snc must parse all 
the header files that are included. However, snc does not contain a 
full-flegded C parser: it recognizes only a small subset of C. 
Particularly, it cannot (IIRC) parse any C declarations.

> Similarly, I'd like to be able to use defines for declaring SNL char
> arrays. For example, it would be great if I could have a file color.h
> that has
>
>    #define MAX_COLOR_NAME_SIZE 21
>
> and then in the SNL program be able to do
>
>    char colorName[MAX_COLOR_NAME_SIZE];
>
> This allows me to have the SNL program and other C code make use of
> this MAX_COLOR_NAME_SIZE define so that it can be defined in just one
> place.

Provided your header file does only contain SNL constructs and cpp 
instructions (#define, #include, etc.), this should be possible right 
now, by preprocessing the source (with cpp) before compiling with snc.

Ben

Replies:

Re: snc/seq enhancements ... local-variable access Eric Norum

References:

snc/seq enhancements ... local-variable access Laznovsky, Michael

Re: snc/seq enhancements ... local-variable access J. Lewis Muir

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