07-04-2011
Corona688, thanks for you reply. I'm kind of new to the makefile business...
You are right, if I use "echo $VERSION" under any of the rules, the "`" expression will be evaluated, and the correct version string will be printed. So, is this the correct way people do to get some contents into the makefile?
This seems kind of odd to me, because each occurrence of $VERSION will cause an evaluation of the "`" expression. This is not what I would expect the behavior for the "variable" be. Or is there a better way to do this in make?
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LEARN ABOUT DEBIAN
makefile::ast
Makefile::AST(3pm) User Contributed Perl Documentation Makefile::AST(3pm)
NAME
Makefile::AST - AST for (GNU) makefiles
DESCRIPTION
The structure of this (GNU) makefile AST is designed based on GNU make's data base listing output produced by "--print-data-base".
This AST library provides the following classes:
Makefile::AST
The primary class for ASTs. Provides interface for node adding and querying, such as "add_implicit_rule", "apply_implicit_rules",
"add_explicit_rule", "apply_explicit_rules", "add_var", "add_auto_var", "get_var", as well as lots of other utility functions, like
method "eval_var_value" for computing the ultimate values of makefile variables, method "enter_pad" and "leave_pad" for local
variable's scoping pad.
Makefile::AST::Rule::Base
This is the base class for the rule nodes in the AST. It has properties like "normal_prereqs", "order_prereqs", "commands", and
"colon".
Makefile::AST::Rule
This class represents the de-sugared form of simple rules and implicite rules after application. It inherits from
Makefile::AST::Rule::Base, and adds new properties "target" and "other_targets".
Makefile::AST::Rule::Implicit
This class represents the implicit rule nodes in the AST. It inherits from Makefile::AST::Rule::Base, and adds new properties
"targets", "match_anything", and "is_terminal".
Makefile::AST::StemMatch
This class encapsulates the file pattern matching (file names containing "%") and stem substitution algorithms.
Makefile::AST::Variable
It represents the makefile variable nodes in the AST, including "name", "value", "flavor", and "origin".
Makefile::AST::Command
Used to encapsulate information regarding makefile rule commands (e.g. command body, command modifiers "@", "-", "+", and etc.) as a
whole.
LIMITATIONS AND TODO
Adding support for other flavors' makes into this AST library should make a huge amount of sense. The most interesting candiate is
Microsoft's NMAKE.
CODE REPOSITORY
For the very latest version of this script, check out the source from
http://github.com/agentzh/makefile-parser-pm <http://github.com/agentzh/makefile-parser-pm>.
There is anonymous access to all.
AUTHOR
Zhang "agentzh" Yichun "<agentzh@gmail.com>"
COPYRIGHT AND LICENSE
Copyright (c) 2007-2008 by Zhang "agentzh" Yichun (agentzh).
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
SEE ALSO
Makefile::AST::Evaluator, Makefile::Parser::GmakeDB, makesimple, pgmake-db, Makefile::DOM.
perl v5.12.4 2011-08-17 Makefile::AST(3pm)