Fixed Source Form Conditional Compilation Sentinels

| OPENMP API Specification: "Version 5.2 -- GIT rev 95b2e3a44"

3.3.1 Fixed Source Form Conditional Compilation Sentinels

The following conditional compilation sentinels are recognized in ﬁxed form source ﬁles:

 
!$ | *$ | c$

To enable conditional compilation, a line with a conditional compilation sentinel must satisfy the following criteria:

The sentinel must start in column 1 and appear as a single word with no intervening white space;
After the sentinel is replaced with two spaces, initial lines must have a space or zero in column 6 and only white space and numbers in columns 1 through 5; and
After the sentinel is replaced with two spaces, continuation lines must have a character other than a space or zero in column 6 and only white space in columns 1 through 5.

If these criteria are met, the sentinel is replaced by two spaces. If these criteria are not met, the line is left unchanged.

In the following example, the two forms for specifying conditional compilation in ﬁxed source form are equivalent (the ﬁrst line represents the position of the ﬁrst 9 columns):

 
c23456789 
!$ 10 iam = omp_get_thread_num() + 
!$   &          index 
 
#ifdef _OPENMP 
   10 iam = omp_get_thread_num() + 
     &            index 
#endif

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