DOCERR: Using the /4ccstring Switch for Conditional Compilation (49451)


The information in this article applies to:

  • Microsoft FORTRAN Compiler for MS-DOS 4.0
  • Microsoft FORTRAN Compiler for MS-DOS 4.01
  • Microsoft FORTRAN Compiler for MS-DOS 4.1
  • Microsoft FORTRAN Compiler for MS-DOS 5.0
  • Microsoft FORTRAN Compiler for MS-DOS 5.1
  • Microsoft FORTRAN compiler for OS/2 4.1
  • Microsoft FORTRAN compiler for OS/2 5.0
  • Microsoft FORTRAN compiler for OS/2 5.1
This article was previously published under Q49451

SUMMARY

The /4ccstring compiler option switch permits conditional compilation in a source file. According to page 355 of the Microsoft FORTRAN "Reference" manual for versions 5.0 and 5.1,

The /4cc option permits conditional compilation of a source file. The string is a set of alphabetic characters controlling which lines in the source file are to be compiled.

A similar statement appears on page 93 of the Microsoft FORTRAN "User's Guide" for versions 4.0 and 4.1.

MORE INFORMATION

The following code example demonstrates conditional compilation.

Sample Code

C Compile options needed: See below 
      PROGRAM TEST

L     INTEGER*4 NUM
S     INTEGER*2 NUM
R     REAL*4 NUMBER

      END
If you compile this code with the /4ccL option switch, the compiler reserves 4 bytes for NUM. If you specify the /4ccS option switch, the compiler reserves 2 bytes for NUM. If you omit the /4cc option switch, the L, S, and R lines are considered comment lines. If you specify the /4ccLS option switch, a multiply-defined symbol error occurs because NUM is defined twice. Compiling with the /4ccLR or /4ccSR option switch defines NUM with the desired size and defines NUMBER as a REAL*4.
Modification Type:MajorLast Reviewed:12/1/2003
Keywords:KB49451
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