Rational Developer for System z
PL/I for Windows, Version 7.6, Programming Guide

Inference rules example

.obj.exe:
  ilink $<;

example1.exe: example1.obj

example2.exe: example2.obj
  ilink /co example2,,,libv3.lib

The first line above defines an inference rule that causes the ILINK command to create an executable file whenever a change is made in the corresponding object file. The file name in the inference rule is specified with the special macro $< so that the rule applies to any .obj file with an out-of-date executable file.

When NMAKE does not find any commands in the first description block, it checks for a rule that might apply and finds the rule defined on the first two lines of the description file. NMAKE applies the rule, replacing $< with example1.obj when it executes the command, so that the ILINK command becomes

ilink example1.obj;

NMAKE does not search for an inference rule when examining the second description block, because a command is explicitly given.


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