• State Not Answered
  • Locked Locked
  • Replies 4 replies
  • Subscribers 21 subscribers
  • Views 1200 views
  • Users 0 members are here
2025 survey

We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.

Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

How to conditionally NOAREG a fn?

Andrew E. Kalman

Hi All.

Imagine a function that looks like this:

DEFINED_SYMBOL1
type FnName(args) DEFINED_SYMBOL2
{
 ...;
}
By appropriate definition of DEFINED_SYMBOL1 and DEFINED_SYMBOL2, I would like to end up with:
type FnName(args)
{
 ...;
}
or
#pragma NOAREGS
type FnName(args) reentrant
{
 ...;
}
The DEFINED_SYMBOL2 part is really easy, either
#define DEFINED_SYMBOL2
or
>#define DEFINED_SYMBOL2 reentrant
But the DEFINED_SYMBOL1 isn't so easy, because C51 won't allow me to
#define DEFINED_SYMBOL1 #pragma NOAREGS
("misused # operator"). So how should I proceed?

BTW, the source file has multiple functuons in it, so compiling with NAREGS on the command line is not an option.

Thanks,

Parents
  • 0

    One C rule you must obey is that you can't have a pre-proc. directive in a pre-proc. directive. E.g.

    #define ILLEGAL  #pragma
    won't work.

    There is an exception for token pasting and concatenation, e.g.
    #define STRINGER(x)    #x
#define STRING_CAT(x, y) STRINGER(x) ## STRINGER(y)
    Which can be fun.

Reply
  • 0

    One C rule you must obey is that you can't have a pre-proc. directive in a pre-proc. directive. E.g.

    #define ILLEGAL  #pragma
    won't work.

    There is an exception for token pasting and concatenation, e.g.
    #define STRINGER(x)    #x
#define STRING_CAT(x, y) STRINGER(x) ## STRINGER(y)
    Which can be fun.

Children
No data