FORCHECK can create a hierarchical call tree of all referenced subprograms. Modules containing unsaved public data and unsaved common blocks which are not declared in the main program or in the root of its referencing program units are reported. Recursive references are signaled. To keep the output as compact and concise as possible, needless repetitions of sub trees are suppressed. Unreferenced subprograms with their references are presented in separate trees.

Example:

 
 FORCHECK PC V13.00.01  MS5 compiler emulation   20-Jan-02 11:29:06  page: 1 
 REFSTR.FOR

 reference_structure:

      1  .MAIN
      2        SUBR1 
      3        SUBR2
      4              GTCHAR
      5                    FUN 
      6                    LEN
      7                          GTCHAR > 4
   GTCHAR 
 **[312 W] possible recursive reference 
   LEN 
 **[312 W] possible recursive reference
      8              PLTLIN
      9        SUBR3

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