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GNU `make'
**********

This file documents the GNU `make' utility, which determines
automatically which pieces of a large program need to be recompiled,
and issues the commands to recompile them.

   This is Edition 0.71, last updated 19 July 2010, of `The GNU Make
Manual', for GNU `make' version 3.82.

   Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
1997, 1998, 1999, 2000, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
2010 Free Software Foundation, Inc.

     Permission is granted to copy, distribute and/or modify this
     document under the terms of the GNU Free Documentation License,
     Version 1.2 or any later version published by the Free Software
     Foundation; with no Invariant Sections, with the Front-Cover Texts
     being "A GNU Manual," and with the Back-Cover Texts as in (a)
     below.  A copy of the license is included in the section entitled
     "GNU Free Documentation License."

     (a) The FSF's Back-Cover Text is: "You have the freedom to copy and
     modify this GNU manual.  Buying copies from the FSF supports it in
     developing GNU and promoting software freedom."

Overview: Overview of `make'.
Introduction: An introduction to `make'.
Makefiles: Makefiles tell `make' what to do.
Rules: Rules describe when a file must be remade.
Recipes: Recipes say how to remake a file.
Using Variables: You can use variables to avoid repetition.
Conditionals: Use or ignore parts of the makefile based on the values of variables.
Functions: Many powerful ways to manipulate text.
Invoking make: Running. How to invoke `make' on the command line.
Implicit Rules: Use implicit rules to treat many files alike, based on their file names.
Archives: How `make' can update library archives.
Features: Features GNU `make' has over other `make's.
Missing: What GNU `make' lacks from other `make's.
Makefile Conventions: Conventions for writing makefiles for GNU programs.
Quick Reference: A quick reference for experienced users.
Error Messages: A list of common errors generated by `make'.
Complex Makefile: A real example of a straightforward, but nontrivial, makefile.
GNU Free Documentation License: License for copying this manual
Concept Index: Index of Concepts
Name Index: Index of Functions, Variables, & Directives

 --- The Detailed Node Listing ---

Overview of `make'

Preparing: Preparing and running make
Reading: On reading this text
Bugs: Problems and bugs

An Introduction to Makefiles

Rule Introduction: What a rule looks like.
Simple Makefile: A simple makefile
How Make Works: How `make' processes this makefile
Variables Simplify: Variables make makefiles simpler
make Deduces: Letting `make' deduce the recipe
Combine By Prerequisite: Another style of makefile
Cleanup: Rules for cleaning the directory

Writing Makefiles

Makefile Contents: What makefiles contain.
Makefile Names: How to name your makefile.
Include: How one makefile can use another makefile.
MAKEFILES Variable: The environment can specify extra makefiles.
Remaking Makefiles: How makefiles get remade.
Overriding Makefiles: How to override part of one makefile with another makefile.
Reading Makefiles: How makefiles are parsed.
Secondary Expansion: How and when secondary expansion is performed.

Writing Rules

Rule Example: An example explained.
Rule Syntax: General syntax explained.
Prerequisite Types: There are two types of prerequisites.
Wildcards: Using wildcard characters such as `*'.
Directory Search: Searching other directories for source files.
Phony Targets: Using a target that is not a real file's name.
Force Targets: You can use a target without a recipe or prerequisites to mark other targets as phony.
Empty Targets: When only the date matters and the files are empty.
Special Targets: Targets with special built-in meanings.
Multiple Targets: When to make use of several targets in a rule.
Multiple Rules: How to use several rules with the same target.
Static Pattern: Static pattern rules apply to multiple targets and can vary the prerequisites according to the target name.
Double-Colon: How to use a special kind of rule to allow several independent rules for one target.
Automatic Prerequisites: How to automatically generate rules giving prerequisites from source files themselves.

Using Wildcard Characters in File Names

Wildcard Examples: Several examples
Wildcard Pitfall: Problems to avoid.
Wildcard Function: How to cause wildcard expansion where it does not normally take place.

Searching Directories for Prerequisites

General Search: Specifying a search path that applies to every prerequisite.
Selective Search: Specifying a search path for a specified class of names.
Search Algorithm: When and how search paths are applied.
Recipes/Search: How to write recipes that work together with search paths.
Implicit/Search: How search paths affect implicit rules.
Libraries/Search: Directory search for link libraries.

Static Pattern Rules

Static Usage: The syntax of static pattern rules.
Static versus Implicit: When are they better than implicit rules?

Writing Recipes in Rules

Recipe Syntax: Recipe syntax features and pitfalls.
Echoing: How to control when recipes are echoed.
Execution: How recipes are executed.
Parallel: How recipes can be executed in parallel.
Errors: What happens after a recipe execution error.
Interrupts: What happens when a recipe is interrupted.
Recursion: Invoking `make' from makefiles.
Canned Recipes: Defining canned recipes.
Empty Recipes: Defining useful, do-nothing recipes.

Recipe Syntax

Splitting Lines: Breaking long recipe lines for readability.
Variables in Recipes: Using `make' variables in recipes.

Recipe Execution

Choosing the Shell: How `make' chooses the shell used to run recipes.

Recursive Use of `make'

MAKE Variable: The special effects of using `$(MAKE)'.
Variables/Recursion: How to communicate variables to a sub-`make'.
Options/Recursion: How to communicate options to a sub-`make'.
-w Option: How the `-w' or `--print-directory' option helps debug use of recursive `make' commands.

How to Use Variables

Reference: How to use the value of a variable.
Flavors: Variables come in two flavors.
Advanced: Advanced features for referencing a variable.
Values: All the ways variables get their values.
Setting: How to set a variable in the makefile.
Appending: How to append more text to the old value of a variable.
Override Directive: How to set a variable in the makefile even if the user has set it with a command argument.
Multi-Line: An alternate way to set a variable to a multi-line string.
Environment: Variable values can come from the environment.
Target-specific: Variable values can be defined on a per-target basis.
Pattern-specific: Target-specific variable values can be applied to a group of targets that match a pattern.
Suppressing Inheritance: Suppress inheritance of variables.
Special Variables: Variables with special meaning or behavior.

Advanced Features for Reference to Variables

Substitution Refs: Referencing a variable with substitutions on the value.
Computed Names: Computing the name of the variable to refer to.

Conditional Parts of Makefiles

Conditional Example: Example of a conditional
Conditional Syntax: The syntax of conditionals.
Testing Flags: Conditionals that test flags.

Functions for Transforming Text

Syntax of Functions: How to write a function call.
Text Functions: General-purpose text manipulation functions.
File Name Functions: Functions for manipulating file names.
Conditional Functions: Functions that implement conditions.
Foreach Function: Repeat some text with controlled variation.
Call Function: Expand a user-defined function.
Value Function: Return the un-expanded value of a variable.
Eval Function: Evaluate the arguments as makefile syntax.
Origin Function: Find where a variable got its value.
Flavor Function: Find out the flavor of a variable.
Shell Function: Substitute the output of a shell command.
Make Control Functions: Functions that control how make runs.

How to Run `make'

Makefile Arguments: How to specify which makefile to use.
Goals: How to use goal arguments to specify which parts of the makefile to use.
Instead of Execution: How to use mode flags to specify what kind of thing to do with the recipes in the makefile other than simply execute them.
Avoiding Compilation: How to avoid recompiling certain files.
Overriding: How to override a variable to specify an alternate compiler and other things.
Testing: How to proceed past some errors, to test compilation.
Options Summary: Summary of Options

Using Implicit Rules

Using Implicit: How to use an existing implicit rule to get the recipe for updating a file.
Catalogue of Rules: A list of built-in implicit rules.
Implicit Variables: How to change what predefined rules do.
Chained Rules: How to use a chain of implicit rules.
Pattern Rules: How to define new implicit rules.
Last Resort: How to define a recipe for rules which cannot find any.
Suffix Rules: The old-fashioned style of implicit rule.
Implicit Rule Search: The precise algorithm for applying implicit rules.

Defining and Redefining Pattern Rules

Pattern Intro: An introduction to pattern rules.
Pattern Examples: Examples of pattern rules.
Automatic Variables: How to use automatic variables in the recipe of implicit rules.
Pattern Match: How patterns match.
Match-Anything Rules: Precautions you should take prior to defining rules that can match any target file whatever.
Canceling Rules: How to override or cancel built-in rules.

Using `make' to Update Archive Files

Archive Members: Archive members as targets.
Archive Update: The implicit rule for archive member targets.
Archive Pitfalls: Dangers to watch out for when using archives.
Archive Suffix Rules: You can write a special kind of suffix rule for updating archives.

Implicit Rule for Archive Member Targets

Archive Symbols: How to update archive symbol directories.

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