Re: problem with yacc implicit rule

[Paul D. Smith]

%% Crni Gorac <address@hidden> writes:

  cg> Am working on library foo that is using yacc for parsing; got
  cg> foo.y file in project, however I have also unrelated foo.c file in
  cg> project. So I have rules in my makefile to create y.tab.c file
  cg> from foo.y, as well as library from y.tab.c and foo.c files.
  cg> However, henever foo.y is newer from foo.c, make is trying to
  cg> regenerate foo.c from foo.y. Now, I understand that this is
  cg> because of implicit make rule for .y files, but I'm wondering what
  cg> is proper way to avoid this behavior.

Remove the default implicit rule.

See the GNU make manual, section "Canceling Implicit Rules".

You can see a complete catalog of default rules by running this command
(on UNIX, anyway):

  $ make -pf/dev/null

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