Option Checking in C Code

You can also check the source to determine if an option is active. The EBNF syntax is:

OptionActive = __OPTION_ACTIVE__ ("string")

The above is used in the preprocessor and in C code, as shown:

Listing: Using __OPTION__ to Check for Active Options

#if __OPTION_ACTIVE__("-W2")
  // option -W2 is set

#endif

void main(void) {

  int i;

  if (__OPTION_ACTIVE__("-or")) {

    i=2;

  }

}

You can check all valid preprocessor options (e.g., options given at the command line, via the default.env or project.ini files, but not options added with the #pragma OPTION: Additional Options). You perform the same check in C code using -Odocf and #pragma OPTION.

As a parameter, only the option itself is tested and not a specific argument of an option.

See the following listing for a valid and an invalid use of __OPTION_ACTIVE__.

Listing: Using __OPTION_ACTIVE__

#if __OPTION_ACTIVE__("-D")    /* true if any -d option is given  */
#if __OPTION_ACTIVE__("-DABS") /* specific argument - not allowed */

To check for a specific define use:

#if defined(ABS)

If for some reason the Compiler cannot check the specified option (i.e., options that no longer exist), the Compiler issues the message "C1439: illegal pragma __OPTION_ACTIVE__".